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Genetic localization of Bethlem myopathy
G J Jobsis1, P A Bolhuis, J M Boers
1Department of Neurology, H2-214, Academic Medical Center, Amsterdam, The Netherlands.
Neurology
|March 1, 1996
Summary
Researchers identified the genetic cause of Bethlem myopathy, a rare muscle disorder. The study localized the disease gene to chromosome 21q22.3, specifically in the region distal to the PFKL gene.
Area of Science:
- Genetics
- Molecular Biology
- Neurology
Background:
- Bethlem myopathy is a rare autosomal dominant myopathy.
- It is characterized by progressive limb-girdle muscle weakness, atrophy, and joint contractures.
Purpose of the Study:
- To determine the genetic localization of Bethlem myopathy.
- To identify the specific gene responsible for the disorder.
Main Methods:
- Genome-wide search using highly polymorphic microsatellite markers in six Dutch families.
- Analysis of genetic linkage with markers across the autosomes.
- Exclusion of candidate genes, including COL6A1.
Main Results:
- Significant genetic linkage was found with the 21q22.3 locus PFKL (Zmax = 6.86).
- The disease gene was localized distal to PFKL, between COL6A1 and the telomere of chromosome 21q.
- No genetic heterogeneity was observed.
Conclusions:
- The Bethlem myopathy gene is located on chromosome 21q22.3.
- The gene is situated in the region distal to PFKL and between COL6A1 and the chromosome 21q telomere.