Association of vitamin-D and calcitonin receptor gene polymorphism in paediatric nephrolithiasis

Area of Science:

• Genetics
• Pediatric Nephrology
• Molecular Biology

Background:

• Childhood nephrolithiasis, or kidney stones, is a growing concern with complex etiologies.
• Genetic factors are increasingly recognized as contributors to kidney stone formation in pediatric populations.
• The vitamin-D receptor (VDR) and calcitonin receptor (CTR) genes are plausible candidates due to their roles in calcium and phosphate metabolism.

Purpose of the Study:

• To investigate the association between VDR and CTR gene polymorphisms and the risk of childhood nephrolithiasis.
• To explore the potential role of these genetic variations in the pathogenesis of kidney stones in North Indian children.
• To identify candidate genes for genetic predisposition to pediatric calcium oxalate nephrolithiasis.

Main Methods:

• Case-control study involving 50 pediatric patients with kidney stones and 60 healthy pediatric controls from North India.
• Genotyping of VDR (Fok-I polymorphism) and CTR gene polymorphisms using PCR-based restriction analysis.
• Statistical analysis to compare genotype frequencies and assess the odds ratio for stone disease risk.

Main Results:

• A statistically significant difference in genotype frequencies was observed for VDR gene Fok-I polymorphism (P=0.007) and CTR gene polymorphism (P=0.048) between cases and controls.
• The C allele of VDR gene polymorphism showed an odds ratio of 1.83 (0.82-4.09) for stone disease risk.
• The C allele of CTR gene polymorphism indicated an odds ratio of 1.99 (0.90-4.39) for stone disease risk.

Conclusions:

• VDR (Fok-I) and CTR gene polymorphisms are associated with childhood nephrolithiasis in the North Indian population.
• These genetic variations may contribute to the pathogenesis of urinary calculi in children.
• VDR and CTR genes represent potential candidate genes for the genetic basis of pediatric calcium oxalate nephrolithiasis.