Novel methodology for the detection of chromosome 21-specific alpha-satellite DNA sequences.

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

Genomics

journal_title

Genomics

authors

Maratou K,Siddique Y,Kessling AM,Davies GE

doi

10.1006/geno.1999.5786

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

429-32

issue

3

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(99)95786-5

journal_volume

57

pub_type

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