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Hum Genet. 2009 Sep;126(3):375-84. doi: 10.1007/s00439-009-0681-2. Epub 2009 May 12.

Common polymorphic variation in the genetically diverse African insulin gene and its association with size at birth.

Author information

1
Department of Paediatrics, Box 116, Addenbrooke's Hospital, University of Cambridge, Hills Road, Cambridge, CB2 0QQ, UK. cjp1002@cam.ac.uk

Abstract

The insulin variable number of tandem repeats (INS VNTR) has been variably associated with size at birth in non-African populations. Small size at birth is a major determinant of neonatal mortality, so the INS VNTR may influence survival. We tested the hypothesis, therefore, that genetic variation around the INS VNTR in a rural Gambian population, who experience seasonal variation in nutrition and subsequently birth weight, may be associated with foetal and early growth. Six polymorphisms flanking the INS VNTR were genotyped in over 2,500 people. Significant associations were detected between the maternally inherited SNP 27 (rs689) allele and birth length [effect size 17.5 (5.2-29.8) mm; P = 0.004; n = 361]. Significant associations were also found between the maternally inherited African-specific SNP 28 (rs5506) allele and post-natal weight gain [effect size 0.19 (0.05-0.32) z score points/year; P = 0.005; n = 728). These results suggest that in the Gambian population studied there are associations between polymorphic variation in the genetically diverse INS gene and foetal and early growth characteristics, which contribute to overall polygenic associations with these traits.

PMID:
19434426
PMCID:
PMC2760954
DOI:
10.1007/s00439-009-0681-2
[Indexed for MEDLINE]
Free PMC Article

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