Abstract:
:We present a novel method, based on the hybridization of allele-specific oligonucleotide probes, that allows the specific detection of chromosome 21 alpha-satellite sequences. Absence of informative polymorphic markers from the centromeric region of chromosome 21 has constituted one of the difficulties in studying the centromere of this chromosome. The alpha-satellite subfamilies from chromosomes 21 and 13 are almost identical in sequence and thus cannot be distinguished using conventional hybridization techniques. Analysis using nuclear families showed that the centromeric polymorphism, detected using our specific probe and pulsed-field gel restriction analysis, segregates in a Mendelian fashion and exhibits a high degree of polymorphism among unrelated individuals. The alphoid DNA of chromosome 21 is highly polymorphic, useful not only as a definitive anchor for the genetic map, but also for studies of chromosome 21 nondisjunction, including the unequivocal assignment of meiotic origin.
journal_name
Genomicsjournal_title
Genomicsauthors
Maratou K,Siddique Y,Kessling AM,Davies GEdoi
10.1006/geno.1999.5786subject
Has Abstractpub_date
1999-05-01 00:00:00pages
429-32issue
3eissn
0888-7543issn
1089-8646pii
S0888-7543(99)95786-5journal_volume
57pub_type
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