2012
DOI: 10.1186/1755-8166-5-28
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The key role of repeated DNAs in sex chromosome evolution in two fish species with ZW sex chromosome system

Abstract: Despite substantial progress, there are still several gaps in our knowledge about the process of sex chromosome differentiation. The degeneration of sex-specific chromosome in some species is well documented, but it is not clear if all species follow the same evolutionary pathway. The accumulation of repetitive DNA sequences, however, is a common feature. To better understand this involvement, fish species emerge as excellent models because they exhibit a wide variety of sex chromosome and sex determining syst… Show more

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Cited by 42 publications
(17 citation statements)
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References 42 publications
(38 reference statements)
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“…However, in the current study, an elongated W chromosome was observed in the karyotype of arowana females. A similar phenomenon was reported earlier in other fish species and plants, including tongue sole 42 , Leporinus reinhardti 48 and papaya 49 . The apparent size increase of these W chromosomes could either be due to early accumulation of repeats that was shown to precede the transposon-driven decrease of size in heterogametic sex chromosomes 50 or to a higher proportion of insertion to deletions or to a recent translocation of an autosomal fragment onto the proto-W chromosome 47 .…”
Section: Resultssupporting
confidence: 89%
“…However, in the current study, an elongated W chromosome was observed in the karyotype of arowana females. A similar phenomenon was reported earlier in other fish species and plants, including tongue sole 42 , Leporinus reinhardti 48 and papaya 49 . The apparent size increase of these W chromosomes could either be due to early accumulation of repeats that was shown to precede the transposon-driven decrease of size in heterogametic sex chromosomes 50 or to a higher proportion of insertion to deletions or to a recent translocation of an autosomal fragment onto the proto-W chromosome 47 .…”
Section: Resultssupporting
confidence: 89%
“…To date, the cytogenetic data of Neotropical fishes have shown some major trends: karyotypic stability in Anostomidae [ 57 , 58 ], Prochilodontidae [ 58 , 59 61 ], and Curimatidae [ 57 , 62 ], and the existence of species complexes in the genera Astyanax [ 63 ] and Hoplias [ 64 ]. However, the cytogenetic pattern observed in bryconine from Brazilian southeastern coastal basins represents the first case in which synapomorphies of chromosomal banding show monophyly of well-defined morphological species.…”
Section: Discussionmentioning
confidence: 99%
“…The gathering of such novel sequences in sex chromosomes can promote recombination suppression of the sex chromosomes; when recombination is suppressed, such sequences can accumulate rapidly in the recombination-free region. The lack of recombination and release from purifying selection avoids their deletion from the recombination-suppressed region [87,88].…”
Section: Roles Played In the Sex Chromosome Evolutionmentioning
confidence: 99%