Journal
OSTEOPOROSIS INTERNATIONAL
Volume 16, Issue 1, Pages 86-92Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00198-004-1650-1
Keywords
BMC; BMD; COL1A1; QTDT; TGF-beta 1
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Funding
- NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES [K01AR002170] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM060402] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [P01DC001813] Funding Source: NIH RePORTER
- NIAMS NIH HHS [K01 AR02170-01] Funding Source: Medline
- NIDCD NIH HHS [P01 DC01813-07] Funding Source: Medline
- NIGMS NIH HHS [R01 GM60402-01A1] Funding Source: Medline
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Transforming growth factor beta 1 (TGF-beta1) is involved in bone metabolism and collagen type I alpha I (COL I A I) is the most abundant protein of bone matrix. Both have been considered as candidate genes for osteoporosis. In this study, we employed the transmission disequilibrium test (TDT) to examine the relationship between each of the two genes with bone mineral density (BMD) and bone mineral content (BMC) at the spine and hip in a sample of 1668 subjects from 387 Caucasian nuclear families. For the TGF-beta1 gene, three SNPs, SNP1, SNP2, and SNP4 (located in exon 1, intron 4 and intron 5, respectively) were tested and the minor allele frequencies were 30.9%, 2.1% and 27.0%, respectively. All eight possible haplotypes (TGF1-8) were observed. For the COL1A1 gene, the minor allele frequencies of SNP5, SNP6 and SNP8 (located in exon 1, intron 1, and exon 45, respectively) were 15.2%, 18.7%, 2.0%, respectively, and only six of eight potential haplotypes (COL1-6) were obtained. In the whole sample, total associations were observed between haplotype COL5 with spine BMD (P=0.027), haplotypes COL3 and TGF4 with hip BMC (P=0.002, 0.003, respectively). Within-family associations were found for spine BMD at haplotypes TGF4 (P=0.027) in female offspring families and TGF3 (P = 0.021) in male offspring families. Further studies with denser markers and larger sample size are required to eventually define the relationship between these two genes with bone mass at the spine and hip.
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