A common, painful condition with a real genetic component. A whole-genome study of Iceland's own population found a risk variant in a gene that normally helps keep calcium crystals from forming in urine in the first place.
Kidney stones (nephrolithiasis) form when minerals and salts in urine -- most often calcium combined with oxalate or phosphate -- crystallize into hard deposits in the kidney. They are common, often extremely painful when they pass, and tend to recur once someone has had one; a meaningful share of that recurrence risk is genetic rather than purely dietary.
The study behind this page took advantage of Iceland's deCODE genetics resource: whole-genome sequencing of 2,636 Icelanders was used to impute 28.3 million sequence variants into a much larger group -- 5,419 kidney stone cases, including 2,172 with a history of recurrent stones, against 279,870 controls. The strongest signal reported was rs1256328, in ALPL (odds ratio 1.21).
ALPL encodes an enzyme that breaks down extracellular inorganic pyrophosphate -- a molecule that normally works specifically to inhibit calcium oxalate and calcium phosphate crystals from forming in urine. A variant that increases ALPL activity would deplete this natural inhibitor faster, which is a biologically direct, plausible mechanism for raising stone risk, not just a statistical association.
Kidney stones are diagnosed by imaging (CT or ultrasound) once someone has symptoms, and prevention after a first stone is guided by urine and blood chemistry, not genotype -- adequate fluid intake, and depending on stone type, dietary changes (sodium, oxalate, animal protein) or specific medications. A urologist or nephrologist manages recurrent cases.
One variant, modest effect. An odds ratio of 1.21 is a real but small shift in risk -- hydration and diet remain the interventions with the strongest evidence for preventing kidney stones, regardless of this genotype.
What a 23andMe/AncestryDNA export or raw VCF can and can't tell you about Kidney Stones comes down to these specific, well-studied positions — not a diagnosis.
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Kidney Stones. MyGeneLog™. https://www.mygenelog.com/conditions/kidney-stones
No. It is a single common variant with a modest effect (odds ratio 1.21) found in one large population study. Hydration and diet remain the interventions with the strongest evidence for prevention.
It encodes an enzyme that breaks down a molecule that normally helps prevent calcium crystals from forming in urine. More enzyme activity means less of that natural protection -- a direct, plausible mechanism for the association, not just a statistical one.
Diagnosed by imaging once symptoms appear. Prevention after a first stone is guided by urine and blood chemistry -- fluid intake and, depending on stone type, dietary or medical changes -- not by genotype.
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