"Compensatory" uniparental disomy of chromosome 21 in two cases.

Abstract:

:Two cases of growth failure, microcephaly, facial dysmorphism, muscular hypertonia, and severe psychomotor retardation are described. At birth, both cases had cytogenetic mosaicism in lymphocytes and skin fibroblasts, in case 1 ring chromosome 21 and monosomy 21 and in case 2, deletion of chromosome 21 and monosomy 21. At a later age the lymphocyte karyotype changed almost completely to 46,XX, but the fibroblast karyotype remained as before. DNA polymorphism analysis described elsewhere indicated that the 46,XX lymphocytes contained two identical chromosomes 21 (isodisomy), in case 1 inherited from the father and in case 2 from the mother. The isodisomy was the result of duplication of a chromosome in mitosis after the loss of the homologous abnormal chromosome ("compensatory isodisomy"). We report here that this cytogenetic mechanism can result in false normal cytogenetic findings. The phenotypes were attributed to the cells with monosomy 21 in case 1 and to the deletion and monosomy of chromosome 21 in case 2.

journal_name

J Med Genet

authors

Bartsch O,Petersen MB,Stuhlmann I,Mau G,Frantzen M,Schwinger E,Antonarakis SE,Mikkelsen M

doi

10.1136/jmg.31.7.534

subject

Has Abstract

pub_date

1994-07-01 00:00:00

pages

534-40

issue

7

eissn

0022-2593

issn

1468-6244

journal_volume

31

pub_type

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