Replication strategies for rare variant complex trait association studies via next-generation sequencing.

Area of Science:

• Genetics
• Genomic Research
• Complex Trait Analysis

Background:

• Complex traits are influenced by rare genetic variants.
• Next-generation sequencing (NGS) is crucial for identifying these rare variants.
• Replication studies are essential to confirm findings from initial association studies.

Purpose of the Study:

• To compare the efficiency of two gene-based rare variant mapping replication strategies: variant-based and sequence-based.
• To evaluate the impact of study scale and error rates on replication power.

Main Methods:

• Utilized population genetic and phenotypic models to assess replication strategies.
• Simulated scenarios with varying proportions of causative variants and sample sizes.
• Analyzed the influence of sequencing and genotyping errors on study power.

Main Results:

• Sequence-based replication demonstrates consistently higher power than variant-based replication.
• The power advantage of sequence-based replication diminishes in very large studies or when many causative variants are found in stage 1.
• Genotyping is a viable, though potentially temporary, replication solution for large studies using samples from the same population.

Conclusions:

• Sequence-based replication is generally superior, especially for small stage 1 samples or when novel variant discovery is a goal.
• Current sequencing error rates have minimal impact on the comparative advantage of sequence-based replication.
• The choice of replication strategy should consider study scale, sample characteristics, and research objectives.