STS markers spanning the AZFc region of human Y Chromosome (Chr) were used to isolate a series of 14 P1 artificial chromosome (PAC) clones covering at least 560 kb of DNA. End clone analysis of these PAC clones was used to derive 10 new STS markers. Together with other markers mapped to the region, an STS content analysis was used to assemble these PAC clones into three distinct contigs. A minimum tiling path of ten PAC clones was subjected to exon trapping to identify potentially new genes mapping to the AZFs region. In all, 39 potential exons were isolated, including 2 exons from the DAZ gene, 3 exons from the BPY2 gene, 2 exons from the PRY gene, and 1 exon from a member of the RBM II gene family; all these genes have been shown previously to map to the AZFc region. One further exon was found that shows homology to the DFFRY gene, which maps to Yq11.2, indicating that there may be a further copy of this gene or a pseudogene in the distal Yq euchromatin. The majority of the remaining potential exons appear to be novel, suggesting that additional genes lie in the AZFc region. Mapping of these exons by PCR analysis of somatic cell hybrids has shown that six of these exons are homologous to autosomal sequences, and five to sequences on the X Chr. RT-PCR analysis of primary cDNA from adult testis, brain, liver, and skeletal muscle mRNA has shown that 11 of the novel exons are expressed in one or a combination of these tissues, indicating that they form parts of genuine transcripts.
Mammalian Genome – Springer Journals
Published: Jan 1, 1999
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