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- Title
Shared and Species-Specific Patterns of Nascent Y Chromosome Evolution in Two Guppy Species.
- Authors
Morris, Jake; Darolti, Iulia; Bloch, Natasha I.; Wright, Alison E.; Mank, Judith E.
- Abstract
Sex chromosomes form once recombination is halted around the sex-determining locus between a homologous pair of chromosomes, resulting in a male-limited Y chromosome. We recently characterized the nascent sex chromosome system in the Trinidadian guppy (<italic>Poecilia</italic><italic>reticulata</italic>). The guppy Y is one of the youngest animal sex chromosomes yet identified, and therefore offers a unique window into the early evolutionary forces shaping sex chromosome formation, particularly the rate of accumulation of repetitive elements and Y-specific sequence. We used comparisons between male and female genomes in <italic>P. reticulata</italic> and its sister species, Endler’s guppy (<italic>P. wingei</italic>), which share an ancestral sex chromosome, to identify male-specific sequences and to characterize the degree of differentiation between the X and Y chromosomes. We identified male-specific sequence shared between <italic>P. reticulata</italic> and <italic>P. wingei</italic> consistent with a small ancestral non-recombining region. Our assembly of this Y-specific sequence shows substantial homology to the X chromosome, and appears to be significantly enriched for genes implicated in pigmentation. We also found two plausible candidates that may be involved in sex determination. Furthermore, we found that the <italic>P. wingei</italic> Y chromosome exhibits a greater signature of repetitive element accumulation than the <italic>P. reticulata</italic> Y chromosome. This suggests that Y chromosome divergence does not necessarily correlate with the time since recombination suppression. Overall, our results reveal the early stages of Y chromosome divergence in the guppy.
- Subjects
Y chromosome analysis; SEX chromosomes; GUPPIES; PROTEIN kinases; GENETIC sex determination
- Publication
Genes, 2018, Vol 9, Issue 5, p238
- ISSN
2073-4425
- Publication type
Article
- DOI
10.3390/genes9050238