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[Multifactorial diseases: a nightmare for the geneticist].

Josué Feingold¹

¹Inserm U.393, Hôpital Necker Enfants-Malades, 149, rue de Sèvres, 75015 Paris, France. aosaka@cochin.inserm.fr

Medecine Sciences : M/S

|November 9, 2005

Summary

Identifying genes for common familial diseases is challenging due to complex genetic and environmental interactions. Genetic heterogeneity is a major reason why susceptibility gene discovery has proven difficult.

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Area of Science:

Genetics
Complex Disease Genetics

Context:

Common diseases often exhibit familial patterns but lack simple Mendelian inheritance.
Multifactorial diseases arise from complex interactions between polygenic genetic components and environmental factors.

Purpose:

To discuss methods for locating and identifying susceptibility genes for multifactorial diseases.
To highlight challenges in genetic susceptibility gene discovery.

Summary:

Two primary model-free methods, non-parametric linkage analysis (e.g., affected sib pairs) and association studies (allele/genotype frequencies), are used to find disease-predisposing genes.
Identifying these genes is difficult, with many results lacking replication, primarily due to genetic heterogeneity.

Impact:

Current methods for identifying susceptibility genes for common diseases face significant challenges.
Genetic heterogeneity is a key factor hindering reproducible discovery of genes contributing to multifactorial diseases.

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