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Idiopathic calcium urolithiasis: genetic aspects
Insights
Family history and ABO blood groups influence kidney stone formation. Blood group A and a family history of stones are linked to higher risks of hypercalciuria and reduced glycosaminoglycans (GAGs).
Area of Science:
- Nephrology
- Urology
- Medical Genetics
Background:
- Kidney stone disease (nephrolithiasis) is a complex condition with multifactorial etiology.
- Genetic predisposition and metabolic factors are implicated in stone formation.
- The role of ABO blood groups in kidney stone pathogenesis remains underexplored.
Purpose of the Study:
- To investigate the association between ABO blood groups, family history, and metabolic risk factors in kidney stone formers.
- To determine if specific blood types are linked to hypercalciuria and altered glycosaminoglycan levels.
Main Methods:
- Metabolic investigation and ABO blood group determination in 79 kidney stone patients.
- Analysis of family history for kidney stones.
- Measurement of urinary calcium excretion and glycosaminoglycans (GAGs).
Main Results:
- A positive family history for stones was observed in 37.7% of patients.
- Idiopathic hypercalciuria was present in 40.3% of cases, with higher incidence in those with a family history.
- Patients with blood group A showed significantly higher rates of hypercalciuria (54.5%) compared to blood group O (30.7%).
- Reduced GAGs were found in 36.9% of patients, particularly in those with blood group A.
- Blood group A patients with a positive family history exhibited elevated calcium excretion and reduced GAGs.
Conclusions:
- Family history is a significant factor in kidney stone pathogenesis.
- Metabolic alterations, including hypercalciuria and reduced GAGs, may be associated with specific ABO blood phenotypes.
- These findings suggest a potential link between ABO blood groups and an increased susceptibility to kidney stone formation.
Abstract:
Seventy-nine stone-formers underwent a metabolic investigation and ABO blood group determination. Incidence of blood groups in patients was similar to ABO phenotypes distribution in general population. The 37.7 p. 100 showed family history for stones. Idiopathic hypercalciuria was present in 40.3 p. 100 of cases; stone-formers with positive family history had a higher incidence of hypercalciuria (46.8 p. 100) than subjects without affected relatives (31.5 p. 100). Patients with blood group A displayed hypercalciuria in the 54.5 p. 100 of cases while subjects with blood group O only in the 30.7 p. 100 (p less than 0.05). Glycosaminoglycans (GAGs) were reduced in the 36.9 p. 100 of the whole group and particularly in patients of blood group A. Patients with blood group A, with positive family history, showed higher mean values of calcium excretion and lower ones of GAGs. Our results seem to suggest that not only familiar factors play a significant role in stone disease pathogenesis but also some metabolic alteration may be linked to ABO phenotypes.