Chromosomal location and gene paucity of the male specific region on papaya Y chromosome

Qingyi Yu, Shaobin Hou, Roman Hobza, F. Alex Feltus, Xiue Wang, Weiwei Jin, Rachel L. Skelton, Andrea Blas, Cornelia Lemke, Jimmy H. Saw, Paul H. Moore, Maqsudul Alam, Jiming Jiang, Andrew H. Paterson, Boris Vyskot, Ray Ming

Research output: Contribution to journalArticlepeer-review

Abstract

Sex chromosomes in flowering plants evolved recently and many of them remain homomorphic, including those in papaya. We investigated the chromosomal location of papaya's small male specific region of the hermaphrodite Y (Y h) chromosome (MSY) and its genomic features. We conducted chromosome fluorescence in situ hybridization mapping of Yh-specific bacterial artificial chromosomes (BACs) and placed the MSY near the centromere of the papaya Y chromosome. Then we sequenced five MSY BACs to examine the genomic features of this specialized region, which resulted in the largest collection of contiguous genomic DNA sequences of a Y chromosome in flowering plants. Extreme gene paucity was observed in the papaya MSY with no functional gene identified in 715 kb MSY sequences. A high density of retroelements and local sequence duplications were detected in the MSY that is suppressed for recombination. Location of the papaya MSY near the centromere might have provided recombination suppression and fostered paucity of genes in the male specific region of the Y chromosome. Our findings provide critical information for deciphering the sex chromosomes in papaya and reference information for comparative studies of other sex chromosomes in animals and plants.

Original languageEnglish (US)
Pages (from-to)177-185
Number of pages9
JournalMolecular Genetics and Genomics
Volume278
Issue number2
DOIs
StatePublished - Aug 2007

Keywords

  • Carica papaya
  • Repetitive sequences
  • Segmental duplication
  • Sex chromosome evolution
  • Suppression of recombination

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics

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