COL1A1 Sp1 polymorphism associates with bone density in early puberty

Area of Science:

• Genetics and Bone Biology
• Pediatric Endocrinology
• Osteoporosis Research

Background:

• Optimal bone mass acquisition during puberty is crucial for lifelong skeletal health and osteoporosis prevention.
• Genetic factors significantly influence bone mass development.
• The COL1A1 gene plays a vital role in bone collagen formation.

Purpose of the Study:

• To investigate the association between the COL1A1 Sp1 polymorphism and bone mineral density (BMD) in early puberty.
• To examine how different COL1A1 genotypes relate to bone size, geometry, turnover, and material properties in girls.
• To identify potential genetic markers for predicting suboptimal peak bone mass acquisition.

Main Methods:

• Studied 247 girls aged 10-13 years.
• Assessed bone properties using dual-energy X-ray absorptiometry (DXA), peripheral quantitative computed tomography (pQCT), and ultrasound.
• Measured serum bone turnover markers: procollagen type 1 N-terminal propeptide (P1NP), osteocalcin (OC), bone-specific alkaline phosphatase (B-ALP), and tartrate-resistant acid phosphatase 5b (TRACP 5b).

Main Results:

• Girls with the TT genotype exhibited significantly lower total body, lumbar spine, and proximal femur bone mineral content (BMC) and BMD compared to GT and GG genotypes.
• The TT genotype was also associated with lower calcaneal broadband ultrasound attenuation (BUA).
• Significantly lower B-ALP levels and altered ratios of bone turnover markers (P1NP/TRACP 5b and (OC + B-ALP)/TRACP 5b) were observed in the TT genotype group.

Conclusions:

• The COL1A1 Sp1 polymorphism is associated with reduced bone properties in early puberty.
• This polymorphism may influence collagen metabolism and bone turnover, potentially affecting peak bone mass acquisition.
• Findings suggest the COL1A1 polymorphism could aid in identifying children at risk for osteoporosis, informing early preventive strategies.