Genetic variation in GC and CYP2R1 affects 25-hydroxyvitamin D concentration and skeletal parameters: A genome-wide association study in 24-month-old Finnish children

Autoři: Anders Kämpe aff001;  Maria Enlund-Cerullo aff003;  Saara Valkama aff003;  Elisa Holmlund-Suila aff003;  Jenni Rosendahl aff003;  Helena Hauta-alus aff003;  Minna Pekkinen aff003;  Sture Andersson aff003;  Outi Mäkitie aff001
Působiště autorů: Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden aff001;  Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden aff002;  Children’s Hospital, Pediatric Research Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland aff003;  Folkhälsan Research Center, Helsinki, Finland aff004;  Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Finland aff005
Vyšlo v časopise: Genetic variation in GC and CYP2R1 affects 25-hydroxyvitamin D concentration and skeletal parameters: A genome-wide association study in 24-month-old Finnish children. PLoS Genet 15(12): e1008530. doi:10.1371/journal.pgen.1008530
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008530


Vitamin D is important for normal skeletal homeostasis, especially in growing children. There are no previous genome-wide association (GWA) studies exploring genetic factors that influence vitamin D metabolism in early childhood. We performed a GWA study on serum 25-hydroxyvitamin D (25(OH)D) and response to supplementation in 761 healthy term-born Finnish 24-month-old children, who participated in a randomized clinical trial comparing effects of 10 μg and 30 μg of daily vitamin D supplementation from age 2 weeks to 24 months. Using the Illumina Infinium Global Screening Array, which has been optimized for imputation, a total of 686085 markers were genotyped across the genome. Serum 25(OH)D was measured at the end of the intervention at 24 months of age. Skeletal parameters reflecting bone strength were determined at the distal tibia at 24 months using peripheral quantitative computed tomography (pQCT) (data available for 648 children). For 25(OH)D, two strong GWA signals were identified, localizing to GC (Vitamin D binding protein) and CYP2R1 (Vitamin D 25-hydroxylase) genes. The GWA locus comprising the GC gene also associated with response to supplementation. Further evidence for the importance of these two genes was obtained by comparing association signals to gene expression data from the Genotype-Tissue Expression project and performing colocalization analyses. Through the identification of haplotypes associated with low or high 25(OH)D concentrations we used a Mendelian randomization approach to show that haplotypes associating with low 25(OH)D were also associated with low pQCT parameters in the 24-month-old children. In this first GWA study on 25(OH)D in this age group we show that already at the age of 24 months genetic variation influences 25(OH)D concentrations and determines response to supplementation, with genome-wide significant associations with GC and CYP2R1. Also, the dual association between haplotypes, 25(OH)D and pQCT parameters gives support for vertical pleiotropy mediated by 25(OH)D.

Klíčová slova:

Gene expression – Genetic loci – Genome-wide association studies – Haplotypes – Human genetics – Molecular genetics


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