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Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks
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Genetic basis for variation in salinity tolerance between stickleback ecotypes.

Makoto Kusakabe1,2, Asano Ishikawa3, Mark Ravinet3,4

  • 1Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba, 277-8564, Japan.

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|October 6, 2016
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Summary

Genetic adaptation to salinity drives divergence in threespine stickleback (Gasterosteus aculeatus) ecotypes. Researchers identified key genes in gill tissue related to osmoregulation and adaptation to different salt levels.

Keywords:
ATPaseFST differentiationanadromousosmoregulation

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Physiology

Background:

  • Salinity adaptation is a key driver of aquatic organism divergence.
  • Threespine stickleback (Gasterosteus aculeatus) ecotypes provide a model for studying osmoregulation divergence.
  • Understanding genetic mechanisms of osmoregulation is crucial for adaptation studies.

Purpose of the Study:

  • Identify candidate genes underlying adaptation to different salinity environments in stickleback ecotypes.
  • Investigate genetic and genomic changes associated with salinity tolerance.
  • Explore the role of gene expression and amino acid substitutions in adaptation.

Main Methods:

  • Quantitative trait loci (QTL) mapping of plasma sodium levels.
  • RNA-sequencing and microarray analysis of gill tissue gene expression.
  • Whole-genome sequencing and genome scan analysis.
  • Quantitative PCR for validating gene expression divergence.

Main Results:

  • A significant QTL for plasma sodium concentration was identified on chromosome 16.
  • Ten candidate genes related to osmoregulation were identified through expression analysis.
  • Five genes showed predicted functionally important amino acid substitutions.
  • Eight candidate genes were located in genomic islands of high differentiation, indicating divergent selection.
  • Genes involved in ATP synthesis and hormonal signaling were among the candidates.

Conclusions:

  • Integrated genomic approaches successfully identified candidate genes for salinity adaptation.
  • Divergent selection and changes in gene expression/amino acid sequences likely contribute to osmoregulation divergence.
  • Further research is needed to elucidate the precise functions of these genes in salinity tolerance.