Population isolates: their special value for locating genes for bipolar disorder

Area of Science:

• Genetics
• Psychiatry
• Population Genetics

Background:

• Population isolates present unique advantages for genetic research.
• Identifying genetic predispositions for complex diseases like bipolar disorder (BP) is challenging.
• Historical isolation in certain populations can facilitate gene mapping studies.

Purpose of the Study:

• To review the rationale for gene mapping in population isolates for bipolar disorder.
• To present the findings of genetic mapping studies conducted in population isolates to date.
• To discuss the utility of population isolates for genetic analysis of BP.

Main Methods:

• Review of genetic mapping concepts and statistical analysis methods for complex diseases.
• Examination of the utility of historically isolated populations for gene mapping.
• Review of specific bipolar disorder gene studies performed in various population isolates.

Main Results:

• Genetic mapping studies for BP have been conducted in several isolates, including the Amish, Costa Ricans, Finnish, and Canadians (Quebec).
• Significant linkage scores were identified in Costa Rican, Finnish, and Canadian (Quebec) isolates.
• Population isolates offer potential for greater diagnostic homogeneity and consistency.

Conclusions:

• Population isolates provide advantages such as increased homogeneity and diagnostic consistency for BP research.
• Certain population isolates are well-suited for linkage disequilibrium (LD) based association studies.
• LD mapping allows for gene mapping at the population level, complementing pedigree-based approaches.