Recent genomic heritage in Scotland.

Area of Science:

• Population Genetics
• Human Genomics
• Genetic Epidemiology

Background:

• The Generation Scotland Scottish Family Health Study (GS:SFHS) is a large cohort of 23,960 participants from Scotland.
• Genomic data (700K SNPs) is available for 10,000 participants, alongside health and environmental data.
• The cohort serves as a resource for genetic research, particularly for complex traits.

Purpose of the Study:

• To analyze genomic differentiation within the GS:SFHS cohort.
• To optimize sample and methods for future genetic analyses.
• To understand the genomic structure and ancestry of the Scottish population.

Main Methods:

• Combined GS:SFHS genotype data with 1000 Genomes Project data.
• Estimated genomic relationships and performed Principal Component Analyses (PCA).
• Analyzed patterns of rare markers, rare haplotypes, homozygosity, and geographic stratification.

Main Results:

• Identified individuals with potential Italian and African/Asian ancestry based on rare markers and haplotypes.
• Observed homozygosity patterns similar to other European populations.
• Detected local geographic stratification impacting genomic structure and identified a case of uniparental disomy.

Conclusions:

• The study illuminates the historical population genetics of Scotland.
• Findings have implications for studying heritability of traits and for genomic/phenotypic prediction of disease.
• Optimized methods enhance the utility of the GS:SFHS for future genetic research.