Recurrent trisomy 21: four cases in three generations.

Abstract:

:Recurrent trisomy 21: four cases in three generations. While gonadal mosaicism can lead to recurrence of trisomy 21 (T21) for a single couple, the recurrence of free T21 in multiple members of a single pedigree has rarely been reported. We present an unusual pedigree with four cases of Down syndrome (DS) with free T21 were born to four separate women related through three generations of one family. The mothers were aged 18, 21, 29, and approximately 30 years at the time of the births. Using microsatellite markers, we excluded most of chromosome 21, excepting two small regions within 21q11.1 and 21q22.3, as being shared among the mothers of the DS children. However, two members of the pedigree, including one DS mother with a normal G-banded karyotype, carried supernumerary alleles at markers 2503J9TG, D21S369, and D21S215, which span the region from 21pter to 21q11.1. Fluorescence in situ hybridization using a centromeric probe hybridizing to chromosomes 13 and 21 did not reveal a novel location, ruling out a cryptic centromeric translocation between chromosome 21 and any chromosome other than chromosome 13. The level of meiotic recombination on chromosome 21 was unusually high in this family as well. We hypothesize that a cryptic rearrangement within the highly repetitive region of 21q11.1 is present in this family, disrupting pairing and leading to an increased risk of non-disjunction of chromosome 21 in this family.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Gair JL,Arbour L,Rupps R,Jiang R,Bruyère H,Robinson WP

doi

10.1111/j.1399-0004.2005.00512.x

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

430-5

issue

5

eissn

0009-9163

issn

1399-0004

pii

CGE512

journal_volume

68

pub_type

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