BackgroundThe papaya Y chromosome has undergone a degenerative expansion from its ancestral autosome, as a consequence of recombination suppression in the sex determining region of the sex chromosomes. The non-recombining feature led to the accumulation of repetitive sequences in the male- or hermaphrodite-specific regions of the Y or the Yh chromosome (MSY or HSY). Therefore, repeat composition and distribution in the sex determining region of papaya sex chromosomes would be informative to understand how these repetitive sequences might be involved in the early stages of sex chromosome evolution.
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机译：背景技术由于性染色体的性别决定区域中重组的抑制作用，木瓜Y染色体已从其祖先的常染色体进行了退化性扩增。非重组特征导致Y或Y h 染色体（MSY或HSY）的雄性或雌雄同体特异性区域中的重复序列积累。因此，番木瓜性染色体的性别决定区域中的重复组成和分布将有助于了解这些重复序列如何参与性染色体进化的早期阶段。
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