An accumulation of tandem DNA repeats on the Y chromosome in Silene latifolia during early stages of sex chromosome evolution
Jazyk angličtina Země Rakousko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
- MeSH
- chromozom Y genetika MeSH
- DNA primery genetika MeSH
- DNA rostlinná chemie genetika MeSH
- druhová specificita MeSH
- hybridizace in situ fluorescenční MeSH
- konformace nukleové kyseliny MeSH
- molekulární evoluce * MeSH
- molekulární sekvence - údaje MeSH
- pohlavní chromozomy genetika MeSH
- sekvence nukleotidů MeSH
- sekvenční homologie nukleových kyselin MeSH
- Silene klasifikace genetika MeSH
- tandemové repetitivní sekvence MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- DNA primery MeSH
- DNA rostlinná MeSH
Sex chromosomes in mammals are about 300 million years old and typically have a highly degenerated Y chromosome. The sex chromosomes in the dioecious plant Silene latifolia in contrast, represent an early stage of evolution in which functional X-Y gene pairs are still frequent. In this study, we characterize a novel tandem repeat called TRAYC, which has accumulated on the Y chromosome in S. latifolia. Its presence demonstrates that processes of satellite accumulation are at work even in this early stage of sex chromosome evolution. The presence of TRAYC in other species of the Elisanthe section suggests that this repeat had spread after the sex chromosomes evolved but before speciation within this section. TRAYC possesses a palindromic character and a strong potential to form secondary structures, which could play a role in satellite evolution. TRAYC accumulation is most prominent near the centromere of the Y chromosome. We propose a role for the centromere as a starting point for the cessation of recombination between the X and Y chromosomes.
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