Abstract
Fetal growth is an important determinant of cardiometabolic disease risk during childhood and adulthood. The genetic architecture of fetal growth remains largely understudied in ancestrally diverse populations. We conducted genome-wide admixture mapping scan and analysis of genetic ancestry among Hispanic American, African American, European American, and Asian American pregnant women to identify genetic loci associated with fetal growth measures across 13–40 weeks gestation. Fetal growth measures were associated with genome-wide average African, European, Amerindigenous and East Asian ancestry proportions (P ranged from10−3 to 4.8 × 10–2). Admixture mapping analysis identified ten African ancestry loci and three Amerindigenous ancestry loci significantly associated with fetal growth measures at Bonferroni-corrected levels of significance (P ranged from 2.18 × 10–8 to 3.71 × 10–6). At the chr2q23.3–24.2 locus in which higher African ancestry was associated with long bone (femur and humerus) lengths, the T allele of rs13030825 (GALNT13) was associated with longer humerus length in African Americans (β = 0.44, P = 6.25 × 10–6 at week 27; β = 0.39, P = 7.72 × 10–5 at week 40). The rs13030825 SNP accounted for most of the admixture association at the chr2q23.3–24.2 locus and has substantial allele frequency difference between African and European reference samples (FST = 0.55, P = 0.03). Regulatory annotation shows that rs13030825 overlaps with the serum response factor (SRF) transcription factor previously implicated in postnatal bone development of mice. Overall, we identified ancestry-related maternal genetic loci that influence fetal growth, shedding light on molecular pathways that regulate fetal growth and potential effects on health across the lifespan.
Clinical trials registration ClinicalTrials.gov, NCT00912132.
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Data availability
The genotype data underlying the findings reported in this study are available for interested researchers upon request through the NICHD Division of Intramural Population Health Research Biospecimen Repository Access and Data Sharing platform.
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Acknowledgements
The authors acknowledge the research teams at all participating clinical centers for the NICHD Fetal Growth Studies, including Christina Care Health Systems, Columbia University, Fountain Valley Hospital, California, Long Beach Memorial Medical Center, New York Hospital, Queens, Northwestern University, University of Alabama at Birmingham, University of California, Irvine, Medical University of South Carolina, Saint Peters University Hospital, Tufts University, and Women and Infants Hospital of Rhode Island. The authors also acknowledge C-TASC and The EMMES Corporations in providing data and imaging support. Genotyping was performed in the Department of Laboratory Medicine and Pathology, University of Minnesota. This work utilized the computational resources of the NIH HPC Biowulf cluster (http://hpc.nih.gov).
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This work was supported by the Intramural Research Program of the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH) including American Recovery and Reinvestment Act funding via contract numbers HHSN275200800013C; HHSN275200800002I; HHSN27500006; HHSN275200800003IC; HHSN275200800014C; HHSN275200800012C; HHSN275200800028C; HHSN275201000009C and HHSN27500008. Additional support was obtained from the NIH Office of the Director, the National Institute on Minority Health and Health Disparities (NIMHD) and the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).
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FT-A conceived and designed this study; MO, FT-A, DS and JW performed statistical analyses. FT-A wrote the draft manuscript. All authors contributed to interpretation of the results, provided critical intellectual content, and approved the final manuscript.
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Tekola-Ayele, F., Ouidir, M., Shrestha, D. et al. Admixture mapping identifies African and Amerindigenous local ancestry loci associated with fetal growth. Hum Genet 140, 985–997 (2021). https://doi.org/10.1007/s00439-021-02265-4
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DOI: https://doi.org/10.1007/s00439-021-02265-4