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TitleChromosomal location and gene paucity of the male specific region on papaya Y chromosome
AuthorsQingyi 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
PublicationMol Genet Genomics: 1 March 2007
AbstractSex 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 Xuorescence 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 speciWc
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.

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.: 2009 :: Barry Marler :: Plant Genome Mapping Laboratory :: University of Georgia