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Linkage analysis in familial Angelman syndrome
J Wagstaff1, Y Y Shugart, M Lalande
1Genetics Division, Children's Hospital, Boston, MA 02115.
American Journal of Human Genetics
|July 1, 1993
Summary
Angelman syndrome (AS) is caused by imprinted mutations on chromosome 15q11q13. This study analyzes familial cases, identifying specific genetic markers and confirming new mutations in non-deletion AS.
Area of Science:
- Genetics
- Molecular Biology
- Developmental Biology
Background:
- Angelman syndrome (AS) is a neurodevelopmental disorder.
- AS arises from mutations in chromosome 15q11q13, exhibiting imprinting.
- Imprinted mutations show parent-of-origin-specific effects, unlike dominant or recessive inheritance.
Purpose of the Study:
- To investigate the genetic basis of familial Angelman syndrome.
- To analyze inheritance patterns and identify mutation locations in AS families.
- To demonstrate new mutations in non-deletion AS.
Main Methods:
- Microsatellite polymorphism analysis in affected and unaffected siblings.
- Linkage analysis of AS to the GABRB3 locus.
- Recombination event analysis to map mutation location.
Main Results:
- AS siblings shared identical maternal alleles at GABRB3 and GABRA5 loci.
- Analysis indicated the AS mutation is distal to D15S63, consistent with imprinted deletions.
- The study provided the first clear evidence of new mutations in non-deletion AS.
Conclusions:
- Maternal transmission of 15q11q13 mutations causes Angelman syndrome.
- Genetic analysis confirmed imprinted inheritance and localized AS mutations.
- The findings contribute to understanding the genetic heterogeneity of Angelman syndrome.