Accumulation of interspersed and sex-specific repeats in the non-recombining region of papaya sex chromosomes.

ABSTRACT:

Background

The 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.

Results

Detailed composition of interspersed, sex-specific, and tandem repeats was analyzed from 8.1 megabases (Mb) HSY and 5.3 Mb corresponding X chromosomal regions. Approximate

SUBMITTER: Na JK 

PROVIDER: S-EPMC4035066 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature