Relative influence of heritability, environment and genetics on serum sclerostin
1Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA, kuipers@pitt.edu.
Summary
Serum sclerostin levels are influenced by genetics and environmental factors like age, sex, diabetes, and kidney function. Nine single nucleotide polymorphisms (SNPs) in the SOST gene region were associated with sclerostin, indicating its heritability.
Area of Science:
- Genetics and Bone Metabolism
- Endocrinology
- Population Genetics
Background:
- Sclerostin, a Wnt inhibitor encoded by the SOST gene, plays a role in bone mineralization and is implicated in osteoporosis.
- Limited understanding exists regarding the genetic and non-genetic determinants of inter-individual variation in serum sclerostin levels.
Purpose of the Study:
- To identify factors associated with serum sclerostin levels in an Afro-Caribbean population.
- To investigate the heritability of serum sclerostin and its association with genetic variations in the SOST gene region.
Main Methods:
- Serum sclerostin was measured in 446 Afro-Caribbean individuals from multigenerational families.
- Genotyping of 36 common single nucleotide polymorphisms (SNPs) within a 100 kb region of the SOST gene.
- Association analysis of genetic and non-genetic factors with serum sclerostin levels.
Main Results:
- Factors associated with higher sclerostin included increased age, body weight, male sex, diabetes, and reduced kidney function, explaining 25.4% of the variation.
- Serum sclerostin demonstrated significant genetic heritability (0.393).
- Nine SNPs in the SOST region showed nominal association with sclerostin, with three independent signals accounting for 7.8% of phenotypic variation.
Conclusions:
- Serum sclerostin is a heritable trait influenced by both genetic and environmental factors.
- Age, sex, adiposity, diabetes, and kidney function are significant environmental determinants of serum sclerostin.
- Common SNPs within the SOST region contribute to the variation in serum sclerostin levels.
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