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Haplotype analysis and LD detection at DM1 locus.

Ashok Kumar1, Sarita Agarwal1, Sunil Pradhan2

  • 1Department of Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow 226014, India.

Gene
|May 3, 2015
PubMed
Summary
This summary is machine-generated.

This study investigated population genetics of Myotonic Dystrophy type 1 (DM1) in Northern India, identifying specific founder haplotypes. The findings suggest a common origin for mutations in the HhaI and HinfI markers within the DM1 gene.

Keywords:
BpmICKMMDMPK geneHaplotypeHhaIHinfILinkage disequilibrium (LD)Myotonic dystrophy type 1 (DM1)

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Area of Science:

  • Genetics
  • Population Genetics
  • Molecular Biology

Background:

  • Myotonic Dystrophy type 1 (DM1) is the most prevalent adult muscular dystrophy.
  • DM1 is caused by a CTG trinucleotide repeat expansion in the DMPK gene.
  • Haplotypes of neighboring genes influence DM1 pathogenesis.

Purpose of the Study:

  • To characterize population genetic features of DM1 in Northern India.
  • To identify founder haplotypes associated with DM1 in this region.

Main Methods:

  • Included 27 DM1 patients and 76 family members.
  • Utilized PCR-RFLP analysis for genetic polymorphisms (HhaI, HinfI, Bpm1, CKMM).
  • Employed SNP Stat Online Software for haplotype construction and linkage disequilibrium analysis.

Main Results:

  • Identified specific allele frequencies for HhaI, HinfI, BpmI, and CKMM markers.
  • Determined 11, 7, 10, and 11 haplotype groups in patients, fathers, mothers, and combined groups, respectively.
  • The haplotype combination 2/2/1/1/1 (HhaI/HinfI/BpmI/CKM T/CKM N) was most frequent in patients (0.4096).

Conclusions:

  • Established population-specific haplotype frequencies for DM1 in Northern India.
  • Significant linkage disequilibrium was observed between HhaI & HinfI, HinfI & BpmI, and HinfI & CKMM TaqI markers.
  • The HhaI and HinfI markers likely share a common mutation origin in this population.