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Related Experiment Videos

Linkage analyses in tibial muscular dystrophy

P Nokelainen1, B Udd, H Somer

  • 1Department of Human Molecular Genetics, National Public Health Institute, Helsinki, Finland.

Human Heredity
|March 1, 1996
PubMed
Summary

Tibial muscular dystrophy (TMD) is a newly identified muscle disorder. Linkage analysis in a Finnish family suggests TMD may result from a mutation at a novel genetic locus.

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Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Tibial muscular dystrophy (TMD) is a recently identified muscular disease.
  • The initial discovery was in a consanguineous Finnish family with complex phenotypes, including limb-girdle muscular dystrophy.
  • Genetic heterogeneity within the family was suspected due to overlapping symptoms.

Purpose of the Study:

  • To identify the genetic basis of Tibial muscular dystrophy (TMD).
  • To investigate the genetic cause in a complex pedigree exhibiting TMD and limb-girdle muscular dystrophy phenotypes.

Main Methods:

  • Extensive linkage analysis was performed using 157 polymorphic DNA markers.
  • Multiple inheritance models were applied to account for potential intrafamilial genetic heterogeneity.
  • Over 10,000 genotypings were conducted.

Main Results:

  • Several known muscular dystrophy loci were excluded.
  • The linkage analysis provided significant data regarding the genetic underpinnings of TMD.
  • The study successfully narrowed down potential chromosomal regions for the causative gene.

Conclusions:

  • The findings strongly suggest that Tibial muscular dystrophy (TMD) is caused by a mutation.
  • A previously unidentified genetic locus is implicated in the etiology of TMD.
  • Further research is warranted to pinpoint the specific gene and mutation responsible for TMD.

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