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Evolution of the Insulin Gene: Changes in Gene Number, Sequence, and Processing.
1Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada.
Frontiers in Endocrinology
|April 19, 2021
Summary
Insulin
Area of Science:
- Evolutionary biology
- Molecular biology
- Endocrinology
Background:
- Insulin is vital for vertebrate health.
- Species-specific functional modifications of insulin are observed.
- Genome sequencing reveals evolutionary changes in insulin genes.
Purpose of the Study:
- To investigate evolutionary modifications in insulin genes across vertebrates.
- To explore the functional implications of changes in insulin gene number and sequence.
- To understand the impact of altered proteolytic processing on insulin's biological activities.
Main Methods:
- Comparative genomics analysis of insulin coding sequences.
- Bioinformatic identification of gene duplications and sequence variations.
- Analysis of insulin processing pathways in diverse species.
Main Results:
- Identification of numerous insulin gene family expansions and contractions across vertebrate genomes.
- Sequence divergence in insulin genes suggests functional specialization.
- Evidence for alternative insulin processing pathways independent of the canonical two-chain structure.
Conclusions:
- Insulin evolution is characterized by significant gene number and sequence changes.
- These evolutionary modifications allow for species-specific insulin functions.
- Insulin's biological activities can be mediated through non-traditional processing mechanisms.
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