Parental alpha 1-antitrypsin (PI) types and meiotic nondisjunction in the aetiology of Down syndrome.

Abstract:

:In 100 children with Down syndrome (DS), the parental origin of the supernumery chromosome 21 was investigated. In 76 out of the 100 cases the polymorphic regions were informative, i.e. the nondisjunction could be traced. Assessment of the alpha 1-antitrypsin/alpha 1-protease inhibitor (PI) types in these DS children revealed a significantly higher value of non-M PI variants (P less than 0.05). In their fathers the non-M PI variants were not increased, not even in those in whom nondisjunction had taken place. A clearly significantly higher value (P less than 0.001) of non-M PI variants was found in their mothers, particularly when only the MS and MZ types which are recognised as deficiency variants were considered. Most striking, however, is the almost 5-fold increased frequency of MS and MZ types found in mothers where the nondisjunction had occurred during the first meiotic division. This would suggest that PI deficiency interferes with some process leading to non-disjunction. If these findings are confirmed, application of Bayes' theorem enables us to estimate the risk for MZ and MS heterozygous women to have a DS child: this would be 3- to 4- fold higher than for MM homozygous women. This would be of interest for genetic counselling and enhance the benefits of prenatal diagnosis programmes.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Jongbloet PH,Frants RR,Hamers AJ

doi

10.1111/j.1399-0004.1981.tb01037.x

subject

Has Abstract

pub_date

1981-10-01 00:00:00

pages

304-9

issue

4

eissn

0009-9163

issn

1399-0004

journal_volume

20

pub_type

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