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Sampling strategy in linkage studies of affective disorders
M Leboyer1, M C Babron, F Clerget-Darpoux
1INSERM U 155, Unité de Recherches d'Epidemiologie Génétique, Paris, France.
Psychological Medicine
|August 1, 1990
Summary
Replication studies for bipolar disorder genetic linkage on chromosomes X and 11 are inconsistent, suggesting genetic heterogeneity. This study outlines a sampling strategy to address this challenge in affective disorder research.
Area of Science:
- Genetics
- Psychiatry
- Biostatistics
Background:
- Previous studies suggested genetic linkage for bipolar disorder on chromosomes X and 11.
- Replication of these findings has been inconsistent, pointing towards potential genetic heterogeneity.
Purpose of the Study:
- To propose a sampling strategy for replicating linkage findings in affective disorders.
- To estimate the number of families needed to replicate linkage or prove heterogeneity.
Main Methods:
- Statistical estimation of sample sizes required for linkage replication.
- Modeling the impact of genetic heterogeneity on study power.
Main Results:
- Calculations provide the average number of nuclear families needed for replication based on heterogeneity levels.
- Quantification of sample sizes required to detect heterogeneity when linkage is present.
Conclusions:
- Inconsistent linkage findings in bipolar disorder likely stem from genetic heterogeneity.
- A strategic sampling approach is crucial for successful replication and understanding genetic contributions to affective disorders.