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Something Fishy about Siamese Fighting Fish (Betta splendens) Sex: Polygenic Sex Determination or a Newly Emerged Sex-Determining Region?
- Source :
- Cells (2073-4409); Jun2022, Vol. 11 Issue 11, p1764-1764, 24p
- Publication Year :
- 2022
-
Abstract
- Fishes provide a unique and intriguing model system for studying the genomic origin and evolutionary mechanisms underlying sex determination and high sex-chromosome turnover. In this study, the mode of sex determination was investigated in Siamese fighting fish, a species of commercial importance. Genome-wide SNP analyses were performed on 75 individuals (40 males and 35 females) across commercial populations to determine candidate sex-specific/sex-linked loci. In total, 73 male-specific loci were identified and mapped to a 5.6 kb region on chromosome 9, suggesting a putative male-determining region (pMDR) containing localized dmrt1 and znrf3 functional sex developmental genes. Repeat annotations of the pMDR revealed an abundance of transposable elements, particularly Ty3/Gypsy and novel repeats. Remarkably, two out of the 73 male-specific loci were located on chromosomes 7 and 19, implying the existence of polygenic sex determination. Besides male-specific loci, five female-specific loci on chromosome 9 were also observed in certain populations, indicating the possibility of a female-determining region and the polygenic nature of sex determination. An alternative explanation is that male-specific loci derived from other chromosomes or female-specific loci in Siamese fighting fish recently emerged as new sex-determining loci during domestication and repeated hybridization. [ABSTRACT FROM AUTHOR]
- Subjects :
- SEX determination
LOCUS (Genetics)
CHROMOSOMES
SINGLE nucleotide polymorphisms
Subjects
Details
- Language :
- English
- ISSN :
- 20734409
- Volume :
- 11
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Cells (2073-4409)
- Publication Type :
- Academic Journal
- Accession number :
- 157371091
- Full Text :
- https://doi.org/10.3390/cells11111764