Genomic degradation of a young Y chromosome in Drosophila miranda

Bachtrog, Doris; Hom, Emily; Wong, Karen M.; Maside, Xulio; Jong, Pieter J. de

doi:10.1186/gb-2008-9-2-r30

Cited by 153 publications

(173 citation statements)

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“…still harbors many functional genes. Even in this much younger Y chromosome, there is a more than 20-fold greater accumulation of repetitive sequences, mainly transposable elements, compared with that in the X chromosome (Bachtrog et al, 2008). These findings in animal species show that the accumulation of junk DNA is an important step in promoting the morphogenesis of sex chromosomes.…”

mentioning

confidence: 62%

“…Insertion of repetitive sequences into coding genes and regulatory regions induces alteration in the genes' functions and results in gene loss. However, there is no correlation between the insertion of the transposable element and gene dysfunction on the Y chromosome of D. miranda (Bachtrog et al, 2008). Moreover, the rate of gene gain on the Drosophila Y chromosomeusing the sequences of 12 species-is more than 10 times the rate of gene loss, in contrast with the mammalian Y chromosome (Koerich et al, 2008).…”

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confidence: 88%

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Junk DNA promotes sex chromosome evolution

Matsunaga

2009

Heredity

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confidence: 62%

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confidence: 88%

Junk DNA promotes sex chromosome evolution

Matsunaga

2009

Heredity

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“…Rapid degeneration of recently formed Y chromosomes has been demonstrated in Drosophila (Bachtrog et al, 2008) and sticklebacks (Peichel et al, 2001). However, there are few empirical data for W chromosomes.…”

Section: Evolution Of Sex Chromosomes In Congeneric Speciesmentioning

confidence: 99%

Highly conserved Z and molecularly diverged W chromosomes in the fish genus Triportheus (Characiformes, Triportheidae)

et al. 2016

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The main objectives of this study were to test: (1) whether the W-chromosome differentiation matches to species' evolutionary divergence (phylogenetic concordance) and (2) whether sex chromosomes share a common ancestor within a congeneric group. The monophyletic genus Triportheus (Characiformes, Triportheidae) was the model group for this study. All species in this genus so far analyzed have ZW sex chromosome system, where the Z is always the largest chromosome of the karyotype, whereas the W chromosome is highly variable ranging from almost homomorphic to highly heteromorphic. We applied conventional and molecular cytogenetic approaches including C-banding, ribosomal DNA mapping, comparative genomic hybridization (CGH) and cross-species whole chromosome painting (WCP) to test our questions. We developed Z-and W-chromosome paints from T. auritus for cross-species WCP and performed CGH in a representative species (T. signatus) to decipher level of homologies and rates of differentiation of W chromosomes. Our study revealed that the ZW sex chromosome system had a common origin, showing highly conserved Z chromosomes and remarkably divergent W chromosomes. Notably, the W chromosomes have evolved to different shapes and sequence contents within~15-25 Myr of divergence time. Such differentiation highlights a dynamic process of W-chromosome evolution within congeneric species of Triportheus.

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“…Heterochromatinization of the region, which may have originally served as a defense against TEs, probably started, or at least accelerated, the degeneration of the MSY in the papaya (Zhang et al, 2008). Bachtrog et al (2008) showed that in the neo-Y chromosome of D. miranda there are 20 times as many TE insertions compared with the neo-X chromosome. They also show that the fraction of TE insertions is similar in functional and non-functional genes.…”

Section: Processes Acting In Regions Of Reduced Recombinationmentioning

confidence: 99%

The role of repetitive DNA in structure and evolution of sex chromosomes in plants

et al. 2009

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Eukaryotic genomes contain a large proportion of repetitive DNA sequences, mostly transposable elements (TEs) and tandem repeats. These repetitive sequences often colonize specific chromosomal (Y or W chromosomes, B chromosomes) or subchromosomal (telomeres, centromeres) niches. Sex chromosomes, especially non-recombining regions of the Y chromosome, are subject to different evolutionary forces compared with autosomes. In nonrecombining regions of the Y chromosome repetitive DNA sequences are accumulated, representing a dominant and early process forming the Y chromosome, probably before genes start to degenerate. Here we review the occurrence and role of repetitive DNA in Y chromosome evolution in various species with a focus on dioecious plants. We also discuss the potential link between recombination and transposition in shaping genomes.

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Genomic degradation of a young Y chromosome in Drosophila miranda

Abstract: Study of the recently formed neo-Y chromosome of Drosophila miranda demonstrate that degeneration of a recently formed Y-chromosome can proceed very rapidly.

Cited by 153 publications

References 33 publications

Junk DNA promotes sex chromosome evolution

Junk DNA promotes sex chromosome evolution

Highly conserved Z and molecularly diverged W chromosomes in the fish genus Triportheus (Characiformes, Triportheidae)

The role of repetitive DNA in structure and evolution of sex chromosomes in plants

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