Cited by 66Pancreatic function and diabetesDevelopmental Biology and Gene RegulationZebrafish Biomedical Research Applications

Early developmental expression of two insulins in zebrafish (Danio rerio)

Papasani, Madhusudhan R., Robison, Barrie D., Hardy, Ronald W., Hill, Rodney A.·2006·Physiological Genomics

Abstract

We have cloned a second insulin gene in zebrafish and studied temporal and spatial expression of two zebrafish insulin genes. Zebrafish insulin-a ( insa) and -b ( insb) mRNAs are derived from two different DNA contigs on chromosomes 5 and 14, respectively, representing two different insulin genes. Real-time PCR studies suggest that insa is a maternal and also a postzygotic transcript. insa was observed at 1 h postfertilization (hpf) and was rapidly degraded by 6 and 12 hpf but induced at 24 hpf (i.e., after pancreas formation). Expression levels at 24 hpf were ∼220-fold higher than at 6 hpf and were significantly different from earlier time points. At 72 hpf (at time of hatching), zebrafish insa mRNA levels tended to be higher than at 24 hpf and were ∼727-fold higher compared with 6 hpf. This further increase in insa expression may be one of the many rapid physiological changes associated with hatching. insb expression was observed from 1 hpf and was significantly decreased from 12 hpf onward. Its expression levels at 12 and 24 hpf were approximately twofold and sixfold lower, respectively, compared with expression at 6 hpf. insb expression levels at 48 hpf were significantly lower than at 24 hpf but not different from 72 hpf. Expression levels at 72 hpf were ∼61-fold lower than at 6 hpf. In situ hybridization studies showed insb expression in proliferating blastomeres at 3 and 4 hpf. At later time points, insb expression was restricted to the brain and pancreas (24 and 48 hpf). insa expression was observed in the pancreas at 24 and 48 hpf. Expression of insb in blastomeres and head suggests that insb could be acting as a pro-growth, survival, and neurotrophic factor during development. Pancreatic insa and insb may both be involved in regulation of glucose homeostasis as in mammals.

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Crossref · 10.1152/physiolgenomics.00012.2006

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  • Human Insulin is active in zebrafish because its mature form shares extensive amino acid identity with zebrafish Insulin and was previously shown to activate zebrafish Insulin receptors.

    “We suspected that human Insulin would be active in zebrafish because its mature form exhibits extensive amino acid identity (~77%) with that of zebrafish and it was previously shown to activate zebrafish Insulin receptors (Papasani et al., 2006; Toyoshima et al., 2008).”

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Authors
Papasani, M. R., Robison, B. D., Hardy, R. W., & Hill, R. A.
Affiliations
University of Idaho (US)
Venue
Physiological Genomics
Published
2006-09
Volume
27
Issue
1
Pages
79-85
ISSN
  • 1094-8341 (ISSN-L)
  • 1531-2267
OpenAlex
W2116317329
Cited by
66
References
39
Citations by year
2025: 2 · 2024: 2 · 2023: 7 · 2022: 3 · 2021: 1 · 2020: 5 · 2019: 2 · 2018: 5 · 2017: 3 · 2016: 5 · 2015: 4 · 2014: 2 · 2013: 2 · 2012: 2
FWCI
4.04
Type
journal article
Language
en
Open access
closed
Locations
  • Physiological Genomics (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Zebrafish Biomedical Research Applications
Keywords
insulin, zebrafish, gene expression, embryonic development, pancreatic development, maternal mRNA, blastomeres, hatching, glucose homeostasis, neurotrophic factors
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Chromosome Mapping, Cloning, Molecular, Insulin, Molecular Sequence Data, RNA, Messenger, Zebrafish, Gene Expression, Sequence Alignment, In Situ Hybridization, Zebrafish Proteins

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