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Response to Signorovitch et al.

Jean-François Flot1, Nicolas Debortoli2, Bernard Hallet3

  • 1Evolutionary Biology & Ecology, Université libre de Bruxelles, 1050 Bruxelles, Belgium.

Current Biology : CB
|August 25, 2016
PubMed
Summary

Horizontal gene transfers (HGTs) in bdelloid rotifers like Adineta vaga are a more likely explanation for observed allele sharing patterns than Oenothera-like meiosis, especially given the lack of observed meiosis in surveys.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Rotifer Biology

Background:

  • The study investigates allele sharing patterns in Adineta vaga, a bdelloid rotifer.
  • An alternative hypothesis suggests Oenothera-like meiosis could explain these patterns.
  • The authors previously attributed these patterns to horizontal gene transfers (HGTs).

Discussion:

  • The congruence of allele sharing across multiple loci challenges the HGT hypothesis.
  • Massive HGT could explain the pattern if bdelloids lose heterozygosity due to desiccation.
  • However, Oenothera-like meiosis would likely result in observable males and frequent congruent allele sharing, which is not observed.

Key Insights:

  • No trio of Adineta vaga individuals showed congruent allele sharing across four nuclear markers in previous studies.
  • The authors maintain that inter-bdelloid HGTs provide a more parsimonious explanation for their findings.
  • Direct evidence for Oenothera-like meiosis in bdelloids is currently lacking.

Outlook:

  • Further research is needed to definitively distinguish between HGT and alternative meiotic mechanisms in bdelloid rotifers.
  • Investigating the genetic mechanisms underlying desiccation tolerance in Adineta vaga could provide insights.
  • Exploring potential genomic consequences of frequent HGT in asexual organisms remains a key area.