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Multipoint linkage disequilibrium mapping for complex diseases.

Kung-Yee Liang1, Fang-Chi Hsu, Terri H Beaty

  • 1Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland 21205, USA. kyliang@jhsph.edu

Genetic Epidemiology
|November 26, 2003
PubMed
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This study expands linkage disequilibrium (LD) methods for complex diseases. The refined approach identified maternal transmission as key for asthma susceptibility genes on chromosome 11, particularly in early-onset cases.

Area of Science:

  • Genetics
  • Statistical Genetics
  • Complex Disease Research

Background:

  • Linkage disequilibrium (LD) studies using case-parent trios are vital for identifying genes associated with complex diseases.
  • Utilizing dense marker maps simultaneously poses a significant challenge in genetic association studies.
  • Existing methods like the Transmission Disequilibrium Test (TDT) can face multiple testing issues.

Purpose of the Study:

  • To expand a multipoint LD method for simultaneously analyzing multiple markers in complex disease genetics.
  • To investigate gene-gene and gene-environment interactions, genetic heterogeneity, phenotypic refinement, and transmission patterns (paternal vs. maternal).
  • To apply the enhanced method to identify asthma susceptibility genes using case-parent trios.

Main Methods:

Related Experiment Videos

  • Application of an expanded multipoint LD method that utilizes all available trios, regardless of parental heterozygosity.
  • The method provides a single test statistic, mitigating the multiple testing problem inherent in individual marker TDTs.
  • Analysis of asthmatic case-parent trios from the Collaborative Study on the Genetics of Asthma (CSGA).

Main Results:

  • Evidence for linkage and LD in a 13.6 cM region on chromosome 11 was attributed specifically to maternal transmission.
  • No significant evidence of excess paternal transmission was found for the identified region.
  • The discrepancy in preferential transmission was most pronounced in probands with early onset of asthma (≤ 6 years old).

Conclusions:

  • The expanded multipoint LD method offers a unified framework for complex genetic analyses, including interactions and heterogeneity.
  • Maternal transmission plays a significant role in the genetic susceptibility to asthma in the studied region.
  • Early-onset asthma cases may exhibit stronger parent-of-origin effects, highlighting the importance of transmission bias.