Molecular Genetics and Genomics

, Volume 278, Issue 2, pp 177–185

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
Original Paper

DOI: 10.1007/s00438-007-0243-z

Cite this article as:
Yu, Q., Hou, S., Hobza, R. et al. Mol Genet Genomics (2007) 278: 177. doi:10.1007/s00438-007-0243-z

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 (Yh) 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.

Keywords

Carica papayaRepetitive sequencesSegmental duplicationSex chromosome evolutionSuppression of recombination

Supplementary material

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Qingyi Yu
    • 1
  • Shaobin Hou
    • 2
  • Roman Hobza
    • 3
  • F. Alex Feltus
    • 4
  • Xiue Wang
    • 5
  • Weiwei Jin
    • 5
  • Rachel L. Skelton
    • 1
  • Andrea Blas
    • 1
    • 6
  • Cornelia Lemke
    • 4
  • Jimmy H. Saw
    • 2
  • Paul H. Moore
    • 7
  • Maqsudul Alam
    • 2
  • Jiming Jiang
    • 5
  • Andrew H. Paterson
    • 4
  • Boris Vyskot
    • 3
  • Ray Ming
    • 1
    • 8
  1. 1.Hawaii Agriculture Research CenterAieaUSA
  2. 2.Center for Advance Studies in Genomics, Proteomics and BioinformaticsUniversity of HawaiiHonoluluUSA
  3. 3.Laboratory of Plant Development Genetics, Institute of BiophysicsCzech Academy of SciencesBrnoCzech Republic
  4. 4.Plant Genome Mapping LaboratoryUniversity of GeorgiaAthensUSA
  5. 5.Department of HorticultureUniversity of WisconsinMadisonUSA
  6. 6.Department of Molecular Bioscience and BioengineeringUniversity of HawaiiHonoluluUSA
  7. 7.USDA-ARS, Pacific Basin Agricultural Research CenterHiloUSA
  8. 8.Department of Plant BiologyUniversity of Illinois at Urbana-ChampaignUrbanaUSA