Analysis of the IT15 Gene in Huntington's Disease Families

Analysis of the IT15 Gene in Huntington's Disease Families Direct molecular genetic testing carried out in 59 Huntington's disease patients belonging to 46 families from Bashkortostan revealed the (CAG) n repeat expansion in exon 1 of the IT15 gene in 57 of them. By use of this analysis the disease status was not confirmed in two patients with atypical form of the disease and negative family history. The (CAG) n repeat expansion was identified in 27 out of 127 asymptomatic at-risk individuals. Analysis of the mutant (CAG) n allele inheritance demonstrated extremely high instability and high mutation rate predominantly leading to the appearance of the alleles with increasing number of (CAG) n repeats in subsequent generations. The instability was mostly observed in cases of paternal transmission. Almost complete linkage disequilibrium between the (CCG)7 mutant alleles and the del2642 deletion was demonstrated. Three major haplotypes revealed, (CCG)7/del–, (CCG)7/del+, and (CCG)10/del–, implied the existence of at least three sources of the origin of Huntington's disease in Bashkortostan. The identified haplotype frequency distribution patterns displayed similarities with those in European populations. The contribution of a number of genetic factors to the age of onset of Huntington's disease was analyzed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Analysis of the IT15 Gene in Huntington's Disease Families

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2004 by MAIK “Nauka/Interperiodica”
Subject
Biomedicine; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1023/B:RUGE.0000039726.96053.78
Publisher site
See Article on Publisher Site

Abstract

Direct molecular genetic testing carried out in 59 Huntington's disease patients belonging to 46 families from Bashkortostan revealed the (CAG) n repeat expansion in exon 1 of the IT15 gene in 57 of them. By use of this analysis the disease status was not confirmed in two patients with atypical form of the disease and negative family history. The (CAG) n repeat expansion was identified in 27 out of 127 asymptomatic at-risk individuals. Analysis of the mutant (CAG) n allele inheritance demonstrated extremely high instability and high mutation rate predominantly leading to the appearance of the alleles with increasing number of (CAG) n repeats in subsequent generations. The instability was mostly observed in cases of paternal transmission. Almost complete linkage disequilibrium between the (CCG)7 mutant alleles and the del2642 deletion was demonstrated. Three major haplotypes revealed, (CCG)7/del–, (CCG)7/del+, and (CCG)10/del–, implied the existence of at least three sources of the origin of Huntington's disease in Bashkortostan. The identified haplotype frequency distribution patterns displayed similarities with those in European populations. The contribution of a number of genetic factors to the age of onset of Huntington's disease was analyzed.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Oct 19, 2004

References

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