Frontiers in Genetics (Feb 2022)

Genome-Wide SNP Analysis of Hybrid Clariid Fish Reflects the Existence of Polygenic Sex-Determination in the Lineage

  • Dung Ho My Nguyen,
  • Dung Ho My Nguyen,
  • Dung Ho My Nguyen,
  • Jatupong Ponjarat,
  • Nararat Laopichienpong,
  • Nararat Laopichienpong,
  • Nararat Laopichienpong,
  • Thitipong Panthum,
  • Thitipong Panthum,
  • Thitipong Panthum,
  • Worapong Singchat,
  • Worapong Singchat,
  • Worapong Singchat,
  • Syed Farhan Ahmad,
  • Syed Farhan Ahmad,
  • Syed Farhan Ahmad,
  • Ekaphan Kraichak,
  • Narongrit Muangmai,
  • Prateep Duengkae,
  • Prateep Duengkae,
  • Surin Peyachoknagul,
  • Uthairat Na-Nakorn,
  • Uthairat Na-Nakorn,
  • Kornsorn Srikulnath,
  • Kornsorn Srikulnath,
  • Kornsorn Srikulnath,
  • Kornsorn Srikulnath,
  • Kornsorn Srikulnath,
  • Kornsorn Srikulnath

DOI
https://doi.org/10.3389/fgene.2022.789573
Journal volume & issue
Vol. 13

Abstract

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The African catfish (Clarias gariepinus) may exhibit the co-existence of XX/XY and ZZ/ZW sex-determination systems (SDSs). However, the SDS of African catfish might be influenced by a polygenic sex-determination (PSD) system, comprising multiple independently segregating sex “switch” loci to determine sex within a species. Here, we aimed to detect the existence of PSD using hybrid. The hybrid produced by crossing male African catfish with female bighead catfish (C. macrocephalus, XX/XY) is a good animal model to study SDSs. Determining the SDS of hybrid catfish can help in understanding the interactions between these two complex SDS systems. Using the genotyping-by-sequencing “DART-seq” approach, we detected seven moderately male-linked loci and seventeen female-linked loci across all the examined hybrid specimens. Most of these loci were not sex-linked in the parental species, suggesting that the hybrid exhibits a combination of different alleles. Annotation of the identified sex-linked loci revealed the presence of one female-linked locus homologous with the B4GALNT1 gene, which is involved in the spermatogenesis pathway and hatchability. However, this locus was not sex-linked in the parental species, and the African catfish might also exhibit PSD.

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