Abstract:
:Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are distinct neurobehavioral disorders that most often arise from a 4-Mb deletion of chromosome 15q11-q13 during paternal or maternal gametogenesis, respectively. At a de novo frequency of approximately.67-1/10,000 births, these deletions represent a common structural chromosome change in the human genome. To elucidate the mechanism underlying these events, we characterized the regions that contain two proximal breakpoint clusters and a distal cluster. Novel DNA sequences potentially associated with the breakpoints were positionally cloned from YACs within or near these regions. Analyses of rodent-human somatic-cell hybrids, YAC contigs, and FISH of normal or rearranged chromosomes 15 identified duplicated sequences (the END repeats) at or near the breakpoints. The END-repeat units are derived from large genomic duplications of a novel gene (HERC2), many copies of which are transcriptionally active in germline tissues. One of five PWS/AS patients analyzed to date has an identifiable, rearranged HERC2 transcript derived from the deletion event. We postulate that the END repeats flanking 15q11-q13 mediate homologous recombination resulting in deletion. Furthermore, we propose that active transcription of these repeats in male and female germ cells may facilitate the homologous recombination process.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Amos-Landgraf JM,Ji Y,Gottlieb W,Depinet T,Wandstrat AE,Cassidy SB,Driscoll DJ,Rogan PK,Schwartz S,Nicholls RDdoi
10.1086/302510subject
Has Abstractpub_date
1999-08-01 00:00:00pages
370-86issue
2eissn
0002-9297issn
1537-6605pii
S0002-9297(07)62054-0journal_volume
65pub_type
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