Kaja Skjærven

Researcher

Telephone: 97142241

Department: Fôr og ernæring

Kaja Helvik Skjærven has a special interest area related to early embryonic development in fish and how development is affected by environmental conditions such as nutrition, temperature, or toxicants. The core focus is how the different environmental conditions change the potential for gene expression through nutritional based epigenetic changes. The main theme of the work is how nutrients, temperature, or toxicants regulate specifically DNA methylation (epigenetics) intergenerationally (from parents to offspring) and associates the changes in gene expression potential (epigenetics) with more traditional biological procedures like nutrition, physiology and histological analyses.

A few years ago, we wanted to test whether parental vitamin status could affect the next generation. We made a feed with lower vitamin level and gave it to the parents. It lowered the fecundity, but the eggs that were spawned were without deformities. However, RNA sequencing revealed that the embryo stage was affected by parental vitamin status (Skjærven et al., 2016, https://www.nature.com/articles/srep34535). In the next generation, both groups were fed the control feed with sufficient B-vitamin level which resulted in equal growth of the F1 generation. We were quite surprised when we open to dissect the liver of the children, they had pale pink liver color, and the histology showed significantly more fat in the liver, down-regulated genes in fat metabolism and changed over 2800 differentially methylated sites. This is nutritional programming and DNA methylation was one of the mechanisms that controlled the development of the phenotype (Skjærven et al., 2018, https://www.nature.com/articles/s41598-018-21211-5). Recently, we have also shown that changing only one nutrient in the parental feed influenced the which genes where expressed and DNA methylation in the offspring livers (Adam et al., 2019). Now we are doing DNA methylatoion profiles in salmon and trout. Check out our last publications, especially the one in Epigenetics:)

Interested in epigenetics and vertebrate evolution, have a deep dive here: https://www.nature.com/articles/s41467-022-34828-y

Interested in Nutritional Programming, look here: https://onlinelibrary.wiley.com/doi/abs/10.1002/9781119821946.ch10

Updated publication list can be found here: https://scholar.google.com/citations?user=BsCYbzAAAAAJ&hl=no

Subjectarea
Curriculum Vitae
Publications
Net reports
News

Subjectarea

Field of work: fish nutrition, nutrition, embryo development, broodstock, epigenetics, DNA methylation, gene expression, B vitamins, methionine, free amino acids, nutritional programming, 1C nutrient. Species: salmon, zebrafish, cod, plaice, halibut

08.04. 2020, Forkning.no, Chronicle: Drop the calorie count this Easter – rather focus on getting plenty of micronutrients: https://forskersonen.no/kronikk-mat-mat-og-helse/dropp-kaloritellingen-denne-pasken--sats-heller-pa-a-fa-i-deg-mange-mikronaeringsstoff/1667692

08.04. 2020, HI.no,

Enjoy cooking good food at Easter. Fresh ingredients and homemade dinner can strengthen your immune system.https://www.hi.no/hi/nyheter/2020/april/dropp-kaloritellingen-denne-pasken-sats-heller-pa-a-fa-i-deg-mange-mikroneringsstoff

05.05. 2020, Forskning.no, Extra doses of vitamins make salmon fry grow better https://forskning.no/fisk-fiskehelse-havforskningsinstituttet/ekstra-doser-vitaminer-gjor-at-lakseyngel-vokser-bedre/1680295

05.05. 2020, HI.no, Feeds that have more B vitamins and the amino acid methionine ensure growth and reduce fat storage in the liver of salmon in the transition from freshwater to seawater. It can contribute to less mortality in salmon smolt.

https://www.hi.no/hi/nyheter/2020/mai/mer-mikroneringsstoffer-gir-friskere-laks

25.06. 2020 HI.no

When farmed salmon spawn in the summer instead of in the autumn, then the salmon eggs get a lower level of several important nutrients.https://www.hi.no/hi/nyheter/2020/juni/darligere-egg-nar-laksen-gyter-om-sommeren

23.07. 2020 Hatcheryfm.com

Off-season spawning of salmon in RAS facilities affects eggs nutritional status

http://www.hatcheryfm.com/hfm-article/948/Outofseason-spawning-of-salmon-in-RAS-systems-affects-eggs-nutritional-status/

Low folate in feed leads to fewer and weaker fish embryos:

https://www.hi.no/en/hi/news/2017/mars/low-folate-in-feed-leads-to-fewer-and-weaker-fish-embryos

Enough vitamin B in feed can improve fish health:

https://www.hi.no/hi/nyheter/2017/03/folatmangel-i-for-gir-ferre-og-svakare-fiskeembryo

Should consider increasing the amount of vitamin B in salmon feed:

http://www.intrafish.no/fou/1234679/bor-vurdere-aa-oke-mengden-b-vitamin-i-lakseforet

Vitamin B deficiency in fish parents affects offspring:

https://www.hi.no/hi/nyheter/2018/mars/bvitaminmangel

Parental Vitamin B deficiency may affect fish children:

https://forskning.no/2018/03/b-vitaminmangel-hos-foreldre-pavirker-barna/produsert-og-finansiert-av/havforskningsinstituttet

Vitamin B deficiency in fish affects the next generation:

http://www.intrafish.no/nyheter/1450073/b-vitaminmangel-hos-fisk-paavirker-neste-generasjon

Curriculum Vitae

Per Gunnar Fjelldal, Anne-Catrin Adam, Gerd M. Berge, Ingrid Lein, Ernst M. Hevrøy, Ingunn Næve, Rudi R. Seim, Maren Mommens, Kaja H. Skjærven, Tom Hansen, Kristin Hamre. 2023. Female two-sea-winter Atlantic salmon fed broodfish diet for 9 or 17 months had equal egg production capacity and quality, while manipulation of ovulation time altered egg size and quality. Aquaculture 580, https://doi.org/10.1016/j.aquaculture.2023.740227
Espe M., Adam A-C., Saito T. & Skjærven K.H. 2023. Methionine: An indispensable amino acid in cellular metabolism and health of Atlantic salmon – a review. Aquaculture nutrition https://doi.org/10.1155/2023/5706177
J. Klughammer, D. Romanovskaia, et al. C. Bock. 2023. Comparative analysis of genome-scale, base-resolution DNA methylation profiles across 580 animal species. Nature Communications. Doi: 10.1038/s41467-022-34828-y
K.H. Skjærven, A.-C. Adam, T. Saito, R. Waagbø, M. Espe. 2023. Epigenetics in fish nutritional programming. Book chapter number 10 in Epigenetics in Aquaculture. Wiley. Editors: Francesc Piferrer and Hanping Wang.
K.H. Skjærven, M. Mommens, A.-C. Adam, T. Saito, E. Oveland and M. Espe. 2022. Earlier or delayed seasonal broodstock spawning changes nutritional status and metabolic programming of growth for next-generation Atlantic salmon. Aquaculture Vol 554, doi: 10.1016/j.aquaculture.2022.738187
K.H. Skjærven, A.-C. Adam, T. Saito, R. Waagbø, M. Espe. 2022. Nutritional epigenetics. Book chapter number 5 in Cellular and Molecular Approaches in Fish Biology. Elsevier. Editors: I. Fernandez, J. Fernandes, doi: 10.1016/B978-0-12-822273-7.00006-9

https://www.sciencedirect.com/science/article/pii/B9780128222737000069?via%3Dihub

T. Saito, P. Whatmore, J. F. Taylor, J.M.O. Fernandes, A.-C. Adam, D.R. Tocher, M. Espe; K.H. Skjærven. 2022. Micronutrient supplementation affects DNA methylation in male gonads with potential intergenerational epigenetic inheritance involving the embryonic development through glutamate receptor-associated genes. BMC Genomics 23. 115 doi: 10.1186/s12864-022-08348-4
E. Holen, M. Chen, P.G. Fjelldal, K.H. Skjaerven, N.H. Sissener, S.C. Remø. A.J.P. Philip, K. Hamre, V. Vikeså, S. Subramanian, M. Espe, 2022. Tailoring freshwater diets towards boosted immunity and pancreas disease infection robustness in Atlantic salmon post smolts. Fish & Shellfish Immunology vol 120 doi: 10.1016/j.fsi.2021.11.019
N.H. Sissener, K. Hamre, P.G. Fjelldal, A.J.P. Philip, M. Espe, L. Miao, E. Høglund, C. Sørensen, K.H. Skjaerven, E. Holen, S. Subramanian, V. Vikeså, B. Norberg, S.C. Remø. 2021. Can improved nutrition for Atlantic salmon in freshwater increase fish robustness, survival and growth after seawater transfer? Aquaculture vol 542, doi: 10.1016/j.aquaculture.2021.736852
A.J.P. Philip, P.G. Fjelldal, S.C. Remø, C. Selvama, K. Hamre, M. Espe, E. Holen, K.H. Skjaerven, V. Vikeså, S. Subramanian, J.W. Schramac, N.H. Sissener. 2021. Dietary electrolyte balance of Atlantic salmon (Salmo salar) freshwater feeds: Impact on osmoregulation, mineral metabolism and performance in seawater. Aquaculture vol 546 doi: 10.1016/j.aquaculture.2021.737305
Nedoluzhko, R. Mjelle, M. Renström, K.H. Skjærven, F. Piferrer, J. M.O.Fernandes. 2021.The first mitochondrial 5-methylcytosine map in a non-model teleost (Oreochromis niloticus) reveals extensive strand-specific and non-CpG methylation. Genomics, Vol 113, Issue 5, Pages 3050-3057 doi:10.1016/j.ygeno.2021.07.007
A.-C. Adam, T. Saito, M. Espe, P. Whatmore, J. M. O. Fernandes, V. Vikeså, K. H. Skjærven. 2021. Metabolic and molecular signatures of improved growth in Atlantic salmon (Salmo salar) fed surplus levels of methionine, folic acid, vitamin B6 and B12 throughout smoltification. British Journal of Nutrition. doi:10.1017/S0007114521002336
T. Saito, P. Whatmore, J.F. Taylor, J.M.O. Fernandes, A-C. Adam, D. R. Tocher, M. Espe, and K.H. Skjærven. 2021. Micronutrient supplementation affects transcriptional and epigenetic regulation of lipid metabolism in a dose-dependent manner. Epigenetics, doi: 10.1080/15592294.2020.1859867
K. H. Skjærven, E.Oveland, M.Mommens, E. Samori, T. Saito, A-C. Adam, M. Espe 2020. Out-of-season spawning affects the nutritional status and gene expression in both Atlantic salmon female broodstock and their offspring. Comp Biochem Physiol A Mol Integr Physiol. 247:110717. doi: 10.1016/j.cbpa.2020.110717.
L. M. Vera, K. Hamre, M, Espe, G-I. Hemre, K. Skjærven, E-J. Lock, A. J. Prabhu, D. Leeming, H. Migaud, D. R. Tocher, J. F. Taylor 2020 Higher dietary micronutrients are required to maintain optimal performance of Atlantic salmon (Salmo salar) fed a high plant material diet during the full production cycle. Aquaculture. Vol: 528,doi: 10.1016/j.aquaculture.2020.735551
P. Wischhusen, T. Saito, C. Heraud, S.J. Kaushik, B. Fauconneau, A.J. Prabhu, S. Fontagné-Dicharry, K.H. Skjærven. 2020. Parental selenium nutrition affects the one-carbon metabolism and the hepatic DNA methylation pattern of rainbow trout (Oncorhynchus mykiss) in the progeny. Life (Basel). 25;10(8):121. doi: 10.3390/life10080121.
M. Espe, K.H. Skjærven, M. Chen, V. Vikeså, A-C. Adam, T. Saito, E. Holen. 2020. The level of 1C diets fed prior to cell isolation affect lipid metabolism in primary liver cells isolated from Atlantic salmon. Aquaculture Nutrition. doi:10.1111/anu.13058
M. Espe, V. Vikeså, T. H. Thomsen, A-C. Adam, T. Saito and K.H. Skjærven. Atlantic salmon fed a nutrient package of surplus methionine, vitamin B12, folic acid and vitamin B6 improved growth and reduced the relative liver size, but when in excess growth reduced. Aquaculture Nutrition. 1-13, doi:10.1111/anu.13010 (2019)
J.F.Taylor, L.M.Vera, C. De Santis, E.J. Lock, M. Espe, K.H. Skjærven, D. Leeming, J. Del Pozo, J. Mota-Velasco, H. Migaud, K. Hamre, D. R. Tocher. 2019. The effect of micronutrient supplementation on growth and hepatic metabolism in diploid and triploid Atlantic salmon (Salmo salar) parr fed a low marine ingredient diet. Comparative Biochemistry and Physiology, Part B 227: 106-121 doi: 10.1016/j.cbpb.2018.10.004.
P. A. Olsvik, P. Whatmore, S. J. Penglase, K.H. Skjaerven, M. Anglès d'Auriac, S. Ellingsen. Associations between behavioral effects, of bisphenol A and DNA methylation in zebrafish embryos. Front Genet. 8;10:184. doi: 10.3389/fgene.2019.00184 (2019)
A.C. Adam, K.K. Lie, P. Whatmore, L.M. Jakt, M. Moren, K.H. Skjaerven. 2019. Profiling DNA methylation patterns of zebrafish liver associated with parental high dietary arachidonic acid. PLoS One 14, doi: 10.1371/journal.pone.0220934 (2019)
K.H. Skjaerven, L.M. Jakt, J.M.O. Fernandes, J.A. Dahl, A-C. Adam, J. Klughammer, C. Bock, M. Espe. Parental micronutrient deficiency distorts liver DNA methylation and expression of lipid genes associated with a fatty-liver-like phenotype in offspring. Scientific Reports 8, 3055, doi:10.1038/s41598-018-21211-5 (2018)
I.G. Guimaraes, K.H. Skjærven, M. Moren, M. Espe, K. Hamre. Dietary taurine supplementation in plant protein based diets do not affect growth and reproductive performance of zebrafish, Aquaculture Research doi: 10.1111/are.13658 (2018)
A-C. Adam, K.H. Skjaerven, P. Whatmore, M. Moren, K. K. Lie. Parental high dietary arachidonic acid levels modulated the hepatic transcriptome of adult zebrafish (Danio rerio) progeny. PlosOne: doi: 10.1371/journal.pone.0201278PONE-D-17-35539R1 (2018)
A.C. Adam, K.K. Lie, M. Moren, K.H. Skjærven. High dietary arachidonic acid levels induce changes in complex lipids, immune-related eicosanoids and increase levels of oxidized metabolites in zebrafish (Danio rerio) Br J Nutr 117, 1075, doi: 10.1017/S0007114517000903 (2017)
L.M. Vera, C. Metochis, J.F. Taylor, M. Clarkson, K.H. Skjærven, H. Migaud, D.R.L. Tocher. Early nutritional programming affects liver transcriptome in diploid and triploid Atlantic salmon, Salmo salar. BMC Genomics 18, 886, doi: 10.1186/s12864-017-4264-7 (2017)
P.A. Olsvik, K.H. Skjærven, L. Søfteland. Metabolic signatures of bisphenol A and genistein in Atlantic salmon liver cells. Chemosphere 189, 730 doi: 10.1016/ S0045-6535(17)31489-3 (2017)
K.H. Skjærven, L.M. Jakt, J.A. Dahl, M. Espe, H. Aanes, K. Hamre, K., J.M.O. Fernandes. Parental vitamin deficiency affects the embryonic gene expression of immune-, lipid transport- and apolipoprotein genes. Scientific Reports 6, 34535, doi: 10.1038/srep34535 (2016)
K. Hamre, S.J. Penglase, J.D. Rasinger, K.H. Skjærven, P.A. Olsvik. Ontogeny of redox regulation in Atlantic cod (Gadus morhua) larvae. Free Radic Biol Med 73, 337 doi: 10.1016/S0891-5849(14) 00233-0 (2014)
P.A. Olsvik, H. Amlund, O. Saele, S. Ellingsen, K.H. Skjaerven. Impact of dietary selenium on methylmercury toxicity in juvenile Atlantic cod: A transcriptional survey. Chemosphere 120, 199 doi: 10.1016/S0045-6535(14)00772-3 (2015)
P.A. Olsvik, T.D. Williams, H.S. Tung, L. Mirbahai, M. Sanden, K.H. Skjaerven, S. Ellingsen. Impacts of TCDD and MeHg on DNA methylation in zebrafish (Danio rerio) across two generations. Comp Biochem Phys C 165, 17, doi: 10.1016/S1532-0456(14)00077-5 (2014)
K.H. Skjærven, K. Hamre, R.N. Finn and P.A. Olsvik. Thermal stress alters expression of genes involved in one carbon and DNA methylation pathways in Atlantic cod embryos. Comp Biochem Physiol A 173C, 17-27, doi: 10.1016/S1095-6433(14)00053-1 (2014)
K.H. Skjærven, S. Penglase, P.A. Olsvik, K. Hamre. Redox regulation in Atlantic cod (Gadus morhua) embryos developing under normal and heat stressed conditions. Free Radic Biol Med. 57, 29-38, doi: 10.1016/S0891-5849(12)01840-0 (2013)
K.H. Skjærven, P.A. Olsvik, R.N. Finn, E. Holen, K. Hamre. Ontogenetic expression of maternal and zygotic genes in Atlantic cod embryos under ambient and thermally stressed conditions. Comp Biochem Physiol A 159, 196-205, doi: 10.1016/ S1095-6433(11)00059-6 (2011)
L. Oftedal, K.H. Skjærven, R.T. Coyne, B. Edvardsen, T. Rohrlack, O.M. Skulberg, S.O. Døskeland, L. Herfindal. The apoptosis-inducing activity towards leukemia and lymphoma cells in a cyanobacterial culture collection is not associated with mouse bioassay toxicity. J Ind Microbiol Biotechnol. 38, 489-501, doi: 10.1007/s10295-010-0791-9 (2011)
E. Holen, A. Kausland, K.H. Skjærven. Embryonic stem cells isolated from Atlantic cod (Gadus morhua) and the developmental expression of a stage-specific transcription factor ac-Pou2. Fish Physiol Biochem., 36, 1029-1039, doi: 10.1007/s10695-010-9381-z (2010)
S.K. Prestegard, L. Oftedal, R.T. Coyne, G. Nygaard, K.H. Skjærven, G. Knutsen, S.O. Døskeland, L. Herfindal. Marine Benthic Diatoms Contain Compounds Able to Induce Leukemia Cell Death and Modulate Blood Platelet Activity. Mar. Drugs 7, 605-623, doi: 10.3390/md7040605 (2009)
R.F. Martins, M.F. Ramos, L. Herfindal, J.A. Sousa, K.H. Skjærven, and V.M. Vasconcelos. Antimicrobial and Cytotoxic Assessment of Marine Cyanobacteria - Synechocystis and Synechococcus. Mar. Drugs 6, 1–11, PMCID: PMC2474953 (2008)
H. Hagland, F. Selheim, T.J. Keen, K.H. Skjærven, C. Krakstad, A-E. Christensen, L. Herfindal, F. Schwede, H-G. Genieser and S.O. Døskeland. The cAMP Receptors Epac and PKA Synergize To Induce PC12 Cell Neuritogenesis and To Protect Against Apoptosis. Peer review. Proceeding of the 12th International Conference on Second Messengers and Phosphoproteins, 123-128 (2004)
K.H. Skjærven, R.N. Finn, H. Kryvi and H.J. Fyhn Yolk resorption in developing plaice (Pleuronectes platessa). Peer review. In: The Big Fish Bang; Proceedings of the 26th Annual Larval Fish Conference, 193-210 (2003)

Publications

Academic articles

2024

Ocean warming shapes embryonic developmental prospects of the next generation in Atlantic cod

Kaja Helvik Skjærven, Maud Alix, Lene Kleppe, Jorge Manuel de Oliveira Fernandes, Paul Whatmore, Artem Nedoluzhko, Eva Andersson, Olav Sigurd Kjesbu

ICES Journal of Marine Science 81 p. 733-747

2024

One-carbon metabolism nutrients impact the interplay between DNA methylation and gene expression in liver, enhancing protein synthesis in Atlantic salmon

Takaya Saito, Marit Espe, Vibeke Vikeså, Christoph Bock, Tårn H. Thomsen, Anne-Catrin Adam, Jorge Manuel de Oliveira Fernandes, Kaja Helvik Skjærven

Epigenetics 19

2024

Spawning manipulation, broodfish diet feeding and egg production in farmed Atlantic salmon

Per Gunnar Fjelldal, Anne-Catrin Adam, Gerd Marit Berge, Ingrid Lein, Ernst Morten Hevrøy, Ingun Næve, Rudi R. Seim, Maren Mommens, Kaja Helvik Skjærven, Tom Johnny Hansen, Kristin Hamre

Aquaculture 580

2023

Risk assessment of Aquaterra® oil for its intended use as ingredient in fish feed. Scientific Opinion of the Norwegian Scientific Committee for Food and Environment

Tage Thorstensen, Johanna Eva Bodin, Nur Duale, Johan Johansen, Volha Shapaval, Øystein Sæle, Anne-Marthe Ganes Jevnaker, Ville Erling Sipinen, Kristian Prydz, Kaja Helvik Skjærven

VKM Report p. 1-58

2023

Methionine: An Indispensable Amino Acid in Cellular Metabolism and Health of Atlantic Salmon

Marit Espe, Anne-Catrin Adam, Takaya Saito, Kaja Helvik Skjærven

Aquaculture Nutrition 2023

2023

Risk assessment of Aquaterra® oil for its intended use as ingredient in fish feed. Scientific Opinion of the Norwegian Scientific Committee for Food and Environment

Tage Thorstensen, Johanna Eva Bodin, Nur Duale, Anne-Marthe Ganes Jevnaker, Johan Johansen, Ville Erling Sipinen, Volha Shapaval, Øystein Sæle, Kristian Prydz, Kaja Helvik Skjærven

VKM Report 2023 p. 1-58

2023

Risk assessment of Aquaterra® oil for its intended use as ingredient in fish feed

Tage Thorstensen, Johanna Eva Bodin, Nur Duale, Anne-Marthe Ganes Jevnaker, Johan Johansen, Ville Erling Sipinen, Volha Shapaval, Øystein Sæle, Kristian Prydz, Kaja Helvik Skjærven

VKM Report 8 p. 1-58

2023

Comparative analysis of genome-scale, base-resolution DNA methylation profiles across 580 animal species

Johanna Klughammer, Daria Romanovskaia, Amelie Nemc, Annika Posautz, Charlotte A. Seid, Linda C. Schuster, Melissa C. Keinath, Juan Sebastian Lugo Ramos, Lindsay Kosack, Ann Evankow, Dieter Printz, Stefanie Kirchberger, Bekir Ergüner, Paul Datlinger, Nikolaus Fortelny, Christian Schmidl, Matthias Farlik, Kaja Helvik Skjærven, Andreas Bergthaler, Miriam Liedvogel, Denise Thaller, Pamela A. Burger, Marcela Hermann, Martin Distel, Daniel L. Distel, Anna Kübber-Heiss, Christoph Bock

Nature Communications 14

2023

Risk assessment of Aquaterra® oil for its intended use as ingredient in fish feed

Tage Thorstensen, Johanna Eva Bodin, Nur Duale, Anne-Marthe Ganes Jevnaker, Johan Johansen, Ville Erling Sipinen, Volha Shapaval, Sæle Øystein, Kristian Prydz, Kaja Helvik Skjærven

VKM Report 8 p. 1-58

2022

Long-term effect of parental selenium supplementation on the one-carbon metabolism in rainbow trout (Oncorhynchus mykiss) fry exposed to hypoxic stress

Pauline Wischhusen, Cécile Heraud, Kaja Helvik Skjærven, Sadasivam J. Kaushik, Benoit Fauconneau, P. Antony Jesu Prabhu, Stéphanie Fontagné-Dicharry

British Journal of Nutrition 127 p. 23-34

2022

Dietary electrolyte balance of Atlantic salmon (Salmo salar) freshwater feeds: Impact on osmoregulation, mineral metabolism and performance in seawater

P. Antony Jesu Prabhu, Per Gunnar Fjelldal, Sofie C. Remø, Chandrasekar Selvam, Kristin Hamre, Marit Espe, Elisabeth Holen, Kaja Helvik Skjærven, Vibeke Vikså, Saravanan Subramanian, Johan W. Schrama, Nini Sissener

Aquaculture 546

2022

Tailoring freshwater diets towards boosted immunity and pancreas disease infection robustness in Atlantic salmon post smolts

Elisabeth Holen, M Chen, Per Gunnar Fjelldal, Kaja Helvik Skjærven, Nini Sissener, Sofie C. Remø, P. Antony Jesu Prabhu, Kristin Hamre, Vibeke Vikeså, S. Subramanian, Marit Espe

Fish and Shellfish Immunology 120 p. 377-391

2022

Micronutrient supplementation affects DNA methylation in male gonads with potential intergenerational epigenetic inheritance involving the embryonic development through glutamate receptor-associated genes

Takaya Saito, Paul Whatmore, John F. Taylor, Jorge Manuel de Oliveira Fernandes, Anne-Catrin Adam, Douglas R. Tocher, Marit Espe, Kaja Helvik Skjærven

BMC Genomics 23

2022

Dietary plant oil supplemented with arachidonic acid and eicosapentaenoic acid affects the fatty acid composition and eicosanoid metabolism of Atlantic salmon (Salmo salar L.) during smoltification

L. Miao, Sofie C. Remø, Marit Espe, P. Antony Jesu Prabhu, Kristin Hamre, Per Gunnar Fjelldal, Kaja Helvik Skjærven, Elisabeth Holen, Vibeke Vikeså, Nini Sissener

Fish and Shellfish Immunology 123 p. 194-206

2022

Earlier or delayed seasonal broodstock spawning changes nutritional status and metabolic programming of growth for next-generation Atlantic salmon

Kaja Helvik Skjærven, Maren Mommens, Anne-Catrin Adam, Takaya Saito, Eystein Oveland, Marit Espe

Aquaculture 554 p. 1-14

2021

The first mitochondrial 5-methylcytosine map in a non-model teleost (Oreochromis niloticus) reveals extensive strand-specific and non-CpG methylation

Artem Nedoluzhko, Robin Mjelle, Maria Renström, Kaja Helvik Skjærven, Francesc Piferrer, Jorge Manuel de Oliveira Fernandes

Genomics 113 p. 3050-3057

2021

The first mitochondrial 5-methylcytosine map in a non-model teleost (Oreochromis niloticus) reveals extensive strand-specific and non-CpG methylation

Artem Nedoluzhko, Robin Mjelle, Maria Renström, Kaja H. Skjærven, Francesc Piferrer, Jorge Manuel de Oliveira Fernandes

Genomics 113 p. 3050-3057

2021

Can improved nutrition for Atlantic salmon in freshwater increase fish robustness, survival and growth after seawater transfer?

Nini Sissener, Kristin Hamre, Per Gunnar Fjelldal, P. Antony Jesu Philip, Marit Espe, L. Miao, Erik Höglund, Christina Sørensen, Kaja Skjærven, Elisabeth Holen, S. Subramanian, V. Vikeså, Birgitta Norberg, Sofie Remø

Aquaculture 542

2021

Metabolic and molecular signatures of improved growth in Atlantic salmon (Salmo salar) fed surplus levels of methionine, folic acid, vitamin B6 and B12 throughout smoltification.

Anne-Catrin Adam, Takaya Saito, Marit Espe, Paul Whatmore, Jorge Manuel de Oliveira Fernandes, Vibeke Vikeså, Kaja Helvik Skjærven

British Journal of Nutrition

2020

Out-of-season spawning affects the nutritional status and gene expression in both Atlantic salmon female broodstock and their offspring

Kaja Helvik Skjærven, Eystein Oveland, Maren Mommens, Elisa Samori, Takaya Saito, Anne-Catrin Adam, Marit Espe

Comparative Biochemistry and Physiology A 247

2020

Micronutrient supplementation affects transcriptional and epigenetic regulation of lipid metabolism in a dose-dependent manner

Takaya Saito, Paul Whatmore, John F. Taylor, Jorge Manuel de Oliveira Fernandes, Anne-Catrin Adam, Douglas R. Tocher, Marit Espe, Kaja Helvik Skjærven

Epigenetics

2020

Higher dietary micronutrients are required to maintain optimal performance of Atlantic salmon (Salmo salar) fed a high plant material diet during the full production cycle

Luisa M. Vera, Kristin Hamre, Marit Espe, Gro Ingunn Hemre, Kaja Helvik Skjærven, Erik-Jan Lock, P. Antony Jesu Prabhu, Daniel Leeming, Herve Migaud, Douglas R. Tocher, John F. Taylor

Aquaculture 528

2020

The level of 1C diets fed prior to cell isolation affect lipid metabolism in primary liver cells isolated from Atlantic salmon

Marit Espe, Kaja Helvik Skjærven, Ming Chen, Vibeke Vikeså, Anne-Catrin Adam, Takaya Saito, Elisabeth Holen

Aquaculture Nutrition 26 p. p. 1019-1025

2020

Higher dietary micronutrients are required to maintain optimal performance of Atlantic salmon (Salmo salar) fed a high plant material diet during the full production cycle.

Luisa M.Vera, Kristin Hamre, Marit Espe, Gro-Ingunn Hemre, Kaja Skjærven, Erik-Jan Lock, Antony J Prabhu, Daniel Leeming, Herve Migaud, Douglas R. Tocher, John F. Taylor

Aquaculture 528

2020

Out-of-season spawning affects the nutritional status and gene expression in both Atlantic salmon female broodstock and their offspring

Kaja H Skjærven, Eystein Oveland, Maren Mommens, Elisa Samori, Takaya Saito, Anne-Catrin Adam, Marit Espe

Comp Biochem Physiol A Mol Integr Physiol 247

2020

Micronutrient supplementation affects transcriptional and epigenetic regulation of lipid metabolism in a dose-dependent manner.

Takaya Saito, Paul Whatmore, John F. Taylor, Jorge M.O. Fernandes, Anne-Catrin Adam, Douglas R. Tocher, Marit Espe & Kaja H. Skjærven

Epigenetics

2020

The level of 1C diets fed prior to cell isolation affects lipid metabolism in primary liver cells isolated from Atlantic salmon (Salmo salar)

Marit Espe, Kaja Helvik Skjærven, Ming Chen, Vibeke Vikeså, Anne-Catrin Adam, Takaya Saito, Elisabeth Holen

Aquaculture Nutrition 26 p. 1019-1025

2020

Parental selenium nutrition affects the one-carbon metabolism and the hepatic dna methylation pattern of rainbow trout (Oncorhynchus mykiss) in the progeny

Pauline Wischhusen, Takaya Saito, Cécile Heraud, Sadasivam J. Kaushik, Benoit Fauconneau, P. Antony Jesu Prabhu, Stéphanie Fontagné-Dicharry, Kaja Helvik Skjærven

Life 10 p. 1-25

2019

The effect of micronutrient supplementation on growth and hepatic metabolism in diploid and triploid Atlantic salmon (Salmo salar) parr fed a low marine ingredient diet.

John F. Taylor, L.M. Vera, Christian De Santis, Erik-Jan Lock, Marit Espe, Kaja Helvik Skjærven, DJ Leeming, J del Pozo, J Mota-Velasco, Hervé Migaud, Kristin Hamre, Douglas R. Tocher

Comparative Biochemistry and Physiology, Part B 227 p. 106-121

2019

Atlantic salmon fed a nutrient package of surplus methionine, vitamin B12, folic acid and vitamin B6 improved growth and reduced the relative liver size, but when in excess growth reduced

Marit Espe, Vibeke Vikeså, Tårn Helgøy Thomsen, Anne-Catrin Adam, Takaya Saito, Kaja Helvik Skjærven

Aquaculture Nutrition p. 1-13

2019

Profiling DNA methylation patterns of zebrafish liver associated with parental high dietary arachidonic acid.

Anne-Catrin Adam, Kai Kristoffer Lie, Paul Whatmore, Lars Martin Jakt, Mari Moren, Kaja Helvik Skjærven

PLOS ONE 14

2019

Associations Between Behavioral Effects of Bisphenol A and DNA Methylation in Zebrafish Embryos

Pål A Olsvik, Paul Whatmore, Sam J Penglase, Kaja H Skjærven, Marc Anglès d'Auriac, Ståle Ellingsen

Frontiers in Genetics 10

2019

The effect of micronutrient supplementation on growth and hepatic metabolism in diploid and triploid Atlantic salmon (Salmo salar) parr fed a low marine ingredient diet

John F. Taylor, L.M. Vera, Christian De Santis, Erik-Jan Lock, Marit Espe, Kaja Helvik Skjærven, DJ Leeming, J del Pozo, J Mota-Velasco, Hervé Migaud, Kristin Hamre, Douglas R. Tocher

227 p. 106-121

2018

Parental high dietary arachidonic acid levels modulated the hepatic transcriptome of adult zebrafish (Danio rerio) progeny

Anne-Catrin Adam, Kaja Helvik Skjærven, Paul Whatmore, Mari Moren, Kai Kristoffer Lie

PLOS ONE 13

2018

Parental micronutrient deficiency distorts liver DNA methylation and expression of lipid genes associated with a fatty-liver-like phenotype in offspring

Kaja Helvik Skjærven, Lars Martin Jakt, Jorge Manuel de Oliveira Fernandes, John Arne Dahl, Anne-Catrin Adam, Johanna Klughammer, Christoph Bock, Marit Espe

Scientific Reports 8

2018

Dietary taurine supplementation in plant protein based diets do not affect growth and reproductive performance of zebrafish

Igo Gomes Guimarães, Kaja Helvik Skjærven, Mari Moren, Marit Espe, Kristin Hamre

Aquaculture Research 49 p. 2013-2022

2017

High dietary arachidonic acid levels induce changes in complex lipids and immune-related eicosanoids and increase levels of oxidised metabolites in zebrafish (Danio rerio)

Anne-Catrin Adam, Kai Kristoffer Lie, Mari Moren, Kaja Helvik Skjærven

British Journal of Nutrition 117 p. 1075-1085

2017

Metabolic signatures of bisphenol A and genistein in Atlantic salmon liver cells

Pål Asgeir Olsvik, Kaja Helvik Skjærven, Liv Ingeborg Rosvoll Søfteland

Chemosphere 189 p. 730-743

2017

Early nutritional programming affects liver transcriptome in diploid and triploid Atlantic salmon, Salmo salar

LM Vera, C Metochis, John F. Taylor, Michael Clarkson, Kaja Helvik Skjærven, Hervé Migaud, Douglas R. Tocher

BMC Genomics 18 p. 1-15

2016

Parental vitamin deficiency affects the embryonic gene expression of immune-, lipid transport-and apolipoprotein genes

Kaja Helvik Skjærven, Lars Martin Jakt, John Arne Dahl, Marit Espe, Håvard Aanes, Kristin Hamre, Jorge Fernandes

Scientific Reports 6

2015

Impact of dietary selenium on methylmercury toxicity in juvenile Atlantic cod: A transcriptional survey

Pål Asgeir Olsvik, Heidi Amlund, Øystein Sæle, Ståle Ellingsen, Kaja Helvik Skjærven

Chemosphere 120 p. 199-205

2014

Thermal stress alters expression of genes involved in one carbon and DNA methylation pathways in Atlantic cod embryos

Kaja Helvik Skjærven, Kristin Hamre, Samuel Penglase, Roderick Nigel Finn, Pål Asgeir Olsvik

Comparative Biochemistry and Physiology A 173 p. 17-27

2014

Impacts of TCDD and MeHg on DNA methylation in zebrafish (Danio rerio) across two generations

Pål Asgeir Olsvik, Timothy Williams, Hai-Shan Tung, Leda Mirbahai, Monica Sanden, Kaja Helvik Skjærven, Ståle Ellingsen

165 p. 17-27

2014

Ontogeny of redox regulation in Atlantic cod (Gadus morhua) larvae

Kristin Hamre, Samuel Penglase, Josef Daniel Rasinger, Kaja Helvik Skjærven, Pål Asgeir Olsvik

73 p. 337-348

2013

Redox regulation in Atlantic cod (Gadus morhua) embryos developing under normal and heat-stressed conditions

Kaja Helvik Skjærven, Samuel Penglase, Pål Asgeir Olsvik, Kristin Hamre

57 p. 29-38

2011

The apoptosis-inducing activity towards leukemia and lymphoma cells in a cyanobacterial culture collection is not associated with mouse bioassay toxicity

Linn Silje Wathne Oftedal, Kaja Helvik Skjærven, Rosie Theresa Coyne, Bente Edvardsen, Thomas Rohrlack, Olav Skulberg, Stein Ove Doskeland, Lars Herfindal

38 p. 489-501

2011

Ontogenetic expression of maternal and zygotic genes in Atlantic cod embryos under ambient and thermally stressed conditions

Kaja Helvik Skjærven, Pål Asgeir Olsvik, Roderick Nigel Finn, Elisabeth Holen, Kristin Hamre

Comparative Biochemistry and Physiology A 159 p. 196-205

2010

Embryonic stem cells isolated from Atlantic cod (Gadus morhua) and the developmental expression of a stage-specific transcription factor ac-Pou2

Elisabeth Holen, Anette Kausland, Kaja Helvik Skjærven

36 p. 1029-1039

2009

Marine Benthic Diatoms Contain Compounds Able to Induce Leukemia Cell Death and Modulate Blood Platelet Activity

Siv Kristin Prestegard, Linn Silje Wathne Oftedal, Rosie Theresa Coyne, Gyrid Nygård, Kaja Helvik Skjærven, Gjert Knutsen, Stein Ove Doskeland, Lars Herfindal

Marine Drugs 7 p. 605-623

2008

Antimicrobial and cytotoxic assessment of marine cyanobacteria - Synechocystis and synechococcus

Rosário F. Martins, Miguel F. Ramos, Lars Herfindal, José A. Sousa, Kaja Helvik Skjærven, Vitor M. Vasconcelos

Marine Drugs 6 p. 1-11

Other journal contributions

2020

Corrigendum: Associations Between Behavioral Effects of Bisphenol A and DNA Methylation in Zebrafish Embryos (Frontiers in Genetics, (2019), 10, 10.3389/fgene.2019.00184)

Pål Asgeir Olsvik, Paul Whatmore, Samuel Penglase, Kaja Helvik Skjærven, Marc Anglès d’Auriac, Ståle Ellingsen

Frontiers in Genetics 11

2012

Kysttorsken vår er sterkt truet

Skjærven, Kaja Helvik

Bergens Tidende

Scientific lectures

2024

VITAMIN E REQUIREMENT IN ATLANTIC SALMON Salmo salar DURING SMOLTIFICATION AND ENVIRONMENTAL CHALLENGE

Pauline Wischhusen, Kristin Hamre, Antony Jesu Prabhu Philip, Anne-Catrin Adam, Kaja Helvik Skjærven, Sofie c Remø, Ingunn Stubhaug, Nini Hedberg Sissener

2022

Atlantic cod facing climate-driven warming: reproductive physiology under challenging environmental conditions

Maud Alix, Lene Kleppe, Eva Andersson, Lena Birgitta Norberg, Ørjan Karlsen, Paul Whatmore, Jorge Manuel de Oliveira Fernandes, Artem Nedoluzhko, Kaja Helvik Skjærven, Jon Egil Skjæraasen, Olav Sigurd Kjesbu

2022

Seasonal broodstock management influences the nutritional status, gene expression and epigenetic gene regulation in Atlantic salmon progeny

Kaja Helvik Skjærven, Takaya Saito, Jorge Manuel de Oliveira Fernandes, Maren Mommens, Anne-Catrin Adam, Marit Espe

2022

Nutrient-sensitive epigenetic regulation in salmon muscle

Anne-Catrin Adam, Takaya Saito, A.L.K. Putman, Paul Whatmore, Marit Espe, Jorge Manuel de Oliveira Fernandes, Eric A. Miska, Kaja Helvik Skjærven

2022

1-carbon nutrients impact histone modification enrichment in the Atlantic salmon genome

A.L.K. Putman, Anne-Catrin Adam, Takaya Saito, Marit Espe, Kaja Helvik Skjærven, Eric A. Miska

2022

Atlantic cod facing climate-driven warming: Reproductive physiology under challenging environmental conditions

A. Maud, Lene Kleppe, Eva Andersson, Birgitta Norberg, Ørjan Karlsen, Paul Whatmore, Jorge Manuel de Oliveira Fernandes, Artem Nedoluzhko, Kaja Helvik Skjærven, Jon Egil Skjæraasen, Olav Sigurd Kjesbu

2021

The mitochondrial 5-methylcytosine profile in Nile tilapia (Oreochromis niloticus)

Artem Nedoluzhko, Robin Mjelle, Maria Renström, Kaja Helvik Skjærven, Francesc Piferrer, Jorge Manuel de Oliveira Fernandes

2021

Epigenetic mechanism of improved post-smolt growth in Atlantic salmon fed a moderate surplus package of methionine, folic acid, vitamin B6 and B12 throughout smoltification

Kaja Helvik Skjærven, Anne-Catrin Adam, Takaya Saito, Paul Whatmore, A.L.K. Putman, Jorge Manuel de Oliveira Fernandes, Vibeke Vikeså, Marit Espe

2021

Surplus methionine, cobalamin, folate and pyridoxine improved growth and lipid metabolism in Atlantic salmon

Marit Espe, Elisabeth Holen, Anne-Catrin Adam, Takaya Saito, Kaja Helvik Skjærven

2021

Seasonal broodstock management alters the epigenome of the next generation of Atlantic salmon (Salmo salar)

Kaja Helvik Skjærven, Takaya Saito, Jorge Manuel de Oliveira Fernandes, Paul Whatmore, Pedro Araujo, Maren Mommens, Marit Espe

2021

Seasonal broodstock management influences the nutritional status, gene expression and epigenetic gene regulation in Atlantic salmon progeny

Kaja Helvik Skjærven, Takaya Saito, Jorge Manuel de Oliveira Fernandes, Maren Mommens, Paul Whatmore, Anne-Catrin Adam, Marit Espe

2021

Påvirker endret gytetidspunkt neste generasjon?

Kaja Helvik Skjærven, Takaya Saito, Maren Mommens, Eystein Oveland, Anne-Catrin Adam, Marit Espe

2020

Moderat overskudd av mikronæringsstoff i laksefôr gir økt vekst og endrer ernæringssensitive epigenetiske reguleringsmekanismer i muskel til atlantisk laks

Anne-Catrin Adam, Marit Espe, Takaya Saito, Paul Whatmore, Jorge Manuel de Oliveira Fernandes, Kaja Helvik Skjærven

2019

The metabolic footprint of a surplus of dietary micronutrients on salmon muscle – stories from pre- and post-smolts

Anne-Catrin Adam, Marit Espe, Takaya Saito, Paul Whatmore, Kaja Helvik Skjærven

2019

Epigenetic effects of dietary micronutrients in Atlantic salmon (Salmo salar) muscle

Anne-Catrin Adam, Marit Espe, Takaya Saito, Paul Whatmore, Jorge Manuel de Oliveira Fernandes, Kaja Helvik Skjærven

2019

Nutrient-responsive epigenetic programming in Atlantic salmon and zebrafish

Anne-Catrin Adam, Paul Whatmore, Takaya Saito, Marit Espe, Jorge Manuel de Oliveira Fernandes, Luisa M.P. Valente, Kaja Helvik Skjærven

2018

The mitochondrial epigenome of Nile tilapia(Oreochromis niloticus)

Maria Renström, Tomasz Krzysztof Podgorniak, Paul Whatmore, Francesc Piferrer, Steinar Daae Johansen, Kaja Helvik Skjærven, Jorge Manuel de Oliveira Fernandes

2018

Bisfenol A påvirker adferd, genekspresjon og DNA metylering i sebrafisk embryo.

Pål Asgeir Olsvik, Samuel Penglase, Kaja Helvik Skjærven, Marc Angles d'Auriac, Ståle Ellingsen

2018

Profiling DNA methylation patterns of zebrafish liver associated with parental high dietary arachidonic

Anne-Catrin Adam, Kai Kristoffer Lie, Paul Whatmore, Lars Martin Jakt, Mari Moren, Kaja Helvik Skjærven

2018

Nivået av arakidonsyre påvirker genuttrykket og DNA metylering i neste generasjon

Anne-Catrin Adam, Kai Kristoffer Lie, Paul Whatmore, Lars Martin Jakt, Mari Moren, Kaja Helvik Skjærven

2018

Behavioral, transcriptional and whole-genome DNA methylation effects of bisphenol A in zebrafish embryos

Kaja Helvik Skjærven, Paul Whatmore, Samuel Penglase, Marc Angles d'Auriac, Ståle Ellingsen, Pål Asgeir Olsvik

2018

Epigenetic and transcriptional effects of optimizing 1-C nutrients in plant based feeds for Atlantic salmon

Kaja Helvik Skjærven, Jorge Manuel de Oliveira Fernandes, John Arne Dahl, Kristin Hamre, Lars Martin Jakt

2018

Epigenetiske effekter av fiskefôr

Kaja Helvik Skjærven, Lars Martin Jakt, Marit Espe

2018

Effect of dietary inorganic and organic selenium supplementation on reproduction and egg quality in rainbow trout (Oncorhynchus mykiss)

P. Wischhusen, M. Briens, P-A. Geraert, M. Parailloux, B. Bouyssiere, M Bueno, S. Monicou, J. Prahbu, Kaja Helvik Skjærven, B. Fauconneau, Stéphanie Fontagné-Dicharry

2017

Investigating the effect of high dietary arachidonic acid in zebrafish (Danio rerio) using high-throughput technologies

Anne-Catrin Adam, Kai Kristoffer Lie, Mari Moren, Kaja Helvik Skjærven

2016

High arachidonic acid level in the feed for zebrafish changes the metabolism and DNA methylation in both parents and offspring

Anne-Catrin Adam, Kai Kristoffer Lie, Lars Martin Jakt, Mari Moren, Kaja Helvik Skjærven

2015

Changes in metabolic pathways and DNA methylation patterns in zebrafish fed high arachidonic acid levels

Anne-Catrin Adam, Kai Kristoffer Lie, Lars Martin Jakt, Mari Moren, Kaja Helvik Skjærven

2013

Ontogeny of the redox balance in relation to organogenesis in Atlantic cod (Gadus morhua) larvae

Kristin Hamre, Samuel Penglase, Josef Daniel Rasinger, Kaja Helvik Skjærven, Pål Asgeir Olsvik

Poster

2022

Mitochondrial DNA Methylation Profiling in Nile Tilapia (Oreochromis niloticus) through Nanopore Sequencing

Partha Sarathi Tripathy, Artem Nedoluzhko, Kaja Helvik Skjærven, Francesc Piferrer, Jorge Manuel de Oliveira Fernandes

2021

The landscape of two major histone modifications in Atlantic salmon (Salmo Salar) fed a surplus of methionine and B vitamins

A.L.K. Putman, Anne-Catrin Adam, Takaya Saito, Marit Espe, Kaja Helvik Skjærven, Eric A. Miska

2018

Salmon Production and Quantification of Folates using AOAC Trienzyme UHPLC-MS/MS Method

Eystein Overland, Rikard Hageskal, Elsa Samori, Nina Wollertsen, Maren Mommens, Rune Waagbø, Kaja Helvik Skjærven

2016

Behavioral and transcriptional effects of bisphenol A in zebrafish embryos

Pål Asgeir Olsvik, Paul Whatmore, Samuel Penglase, Kaja Helvik Skjærven, Marc Angles d'Auriac, Ståle Ellingsen

2015

Dietary high arachidonic acid level affects the DNA methylation pattern in zebrafish

Anne-Catrin Adam, Kai Kristoffer Lie, Lars Martin Jakt, Mari Moren, Kaja Helvik Skjærven

2015

Insufficient Methionine and B-vitamin Levels in Zebrafish Feed Increases the Liver Lipid Accumulation and Affects Redox Regulation and One Carbon Metabolism in the Next Generation.

Kaja Helvik Skjærven, Jorge Fernandes, Christoph Bock, Johanna Hadler, Håvard Aanes, Kai Kristoffer Lie, Kristin Hamre, John Arne Dahl

2014

Insufficient B-vitamin levels in the feed for zebrafish increases the lipid accumulation in the liver of the next generation.

Kaja Helvik Skjærven, Håvard Aanes, Kai Kristoffer Lie, Kristin Hamre, John Arne Dahl

Reports and dissertations

2023

Program for overvåking av fiskefôr - Årsrapport for prøver innsamlet i 2022

Veronika Sele, Marta Sofia Silva, P. Antony Jesu Prabhu, Kristin Hamre, Kaja Helvik Skjærven, Marit Espe, Nina Sylvia Liland, Kai Kristoffer Lie, Marc HG Berntssen, Anne-Katrine Lundebye

Rapport fra havforskningen

2018

Investigating the metabolic, transcriptomic and DNA methylation signatures of high dietary arachidonic acid in zebrafish. Epigenetic and transcriptional effects in the next generation

Anne-Catrin Adam, Kai Kristoffer Lie, Kaja Helvik Skjærven, Rune Waagbø

2012