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A Genetic Map for the Only Self-Fertilizing Vertebrate.

Akira Kanamori1, Yosuke Sugita2, Yasufumi Yuasa2

  • 1Division of Biological Science, Graduate School of Science, Nagoya University, Aichi 464-8602, Japan kanamori@bio.nagoya-u.ac.jp sakakura@nagasaki-u.ac.jp.

G3 (Bethesda, Md.)
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PubMed
Summary

Researchers mapped the genomes of mangrove killifish, Kryptolebias marmoratus and K. hermaphroditus, the only vertebrates reproducing via self-fertilization. This genetic map aids understanding of their unique hermaphroditism and genome sequencing.

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centromeres and recombinationconserved chromosomesgenetics of sexhermaphroditephylogeny by RAD-seqteleost

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Reproductive Biology

Background:

  • The mangrove killifish (Kryptolebias marmoratus) and Kryptolebias hermaphroditus are unique vertebrates, exclusively reproducing through self-fertilization due to ovotestis development.
  • Understanding the genomes of these species is crucial for insights into their reproductive biology and evolutionary history.

Purpose of the Study:

  • To construct a high-density genetic map for Kryptolebias marmoratus and Kryptolebias hermaphroditus.
  • To provide a genomic framework for future studies on self-fertilization and hermaphroditism in vertebrates.

Main Methods:

  • An F1 generation was produced via artificial fertilization between K. marmoratus and K. hermaphroditus.
  • RAD-sequencing (Restriction site-associated DNA sequencing) was employed on parental strains, the F1 individual, and 49 F2 progeny.
  • 9904 polymorphic RAD-tags were identified and mapped to 24 linkage groups.

Main Results:

  • A genetic map spanning 1248 cM was constructed, with markers distributed unevenly, particularly at chromosome tips, likely due to acrocentric chromosomes.
  • Comparison with medaka and platyfish genomes revealed strong chromosomal conservation over 100 million years.
  • The map comprises 24 linkage groups, corresponding to the haploid chromosome number.

Conclusions:

  • The developed genetic map serves as a foundational resource for the K. marmoratus/K. hermaphroditus genome sequence.
  • This map is vital for advancing research into the genetic basis of hermaphroditism and self-fertilization in vertebrates.
  • Evidence suggests significant conservation of chromosome structure between mangrove killifish and other teleost fish lineages.