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Linkage analysis in familial amyotrophic lateral sclerosis
T Siddique1, M A Pericak-Vance, B R Brooks
1Duke University Medical Center, Durham, NC 27710.
Neurology
|July 1, 1989
Summary
Researchers investigated the genetic basis of familial amyotrophic lateral sclerosis (FALS). Despite analyzing DNA from 131 individuals across 6 families, no specific genetic linkage was found, but regions were excluded for the FALS gene.
Area of Science:
- Genetics
- Neurodegenerative Diseases
- Molecular Biology
Background:
- Familial amyotrophic lateral sclerosis (FALS) accounts for 5-10% of ALS cases.
- FALS typically follows an autosomal dominant inheritance pattern with age-dependent penetrance.
- The underlying biochemical abnormality in FALS remains unidentified.
Purpose of the Study:
- To identify the genetic locus responsible for FALS.
- To analyze DNA from multigenerational FALS families for genetic linkage.
- To exclude chromosomal regions as potential locations for the FALS gene.
Main Methods:
- DNA analysis of 131 members from 6 multigenerational FALS families.
- Utilized 2-point linkage analysis, multilocus linkage analysis, and exclusion mapping.
- Employed computer simulation to identify suitable FALS family structures for linkage analysis.
Main Results:
- No genetic linkage was established between FALS and the 39 expressed and DNA markers studied.
- Significant chromosomal regions were excluded as potential locations for the FALS gene.
- A comprehensive DNA bank of FALS families was utilized, including lymphoblast cell lines and postmortem tissue.
Conclusions:
- Current genetic markers do not pinpoint the FALS gene locus.
- Exclusion mapping has narrowed down potential genomic regions for the FALS gene.
- Future research will focus on the remaining unexcluded regions of the human genome.