ATM · rs748840480
Strength of the evidence
ClinVar classifies it as disease-causing (or likely), reviewed at 2 of 4 stars.
4: ClinVar disease-causing, reviewed by an expert panel or a guideline (3–4 stars). 3: ClinVar, several labs agreeing (2 stars), or a genetic study at p ≤ 10−50. 2: ClinVar from one lab (1 star), or p ≤ 10−20. 1: ClinVar submitted without criteria (0 stars), or genome-wide significance (p ≤ 5×10−8). The higher of the two counts. It says how solid the evidence is, not whether it matters for a particular person.
What ClinVar records
Classification
Pathogenic/Likely pathogenic for Hereditary cancer-predisposing syndrome, Ataxia-telangiectasia syndrome, Familial cancer of breast, Ovarian serous cystadenocarcinoma; criteria provided, multiple submitters, no conflicts (2 of 4 stars, 13 submitters), last evaluated 2026-01-25.
ClinVar record 186761 NM_000051.4(ATM):c.901+1G>A
Classification
Pathogenic/Likely pathogenic for Hereditary cancer-predisposing syndrome, Ataxia-telangiectasia syndrome, Familial cancer of breast; criteria provided, multiple submitters, no conflicts (2 of 4 stars, 6 submitters), last evaluated 2025-08-04.
ClinVar record 234172 NM_000051.4(ATM):c.901+1G>T
Classification
Pathogenic/Likely pathogenic for Hereditary cancer-predisposing syndrome, Ataxia-telangiectasia syndrome, Familial cancer of breast; criteria provided, multiple submitters, no conflicts (2 of 4 stars, 4 submitters), last evaluated 2025-07-16.
ClinVar record 379348 NM_000051.4(ATM):c.901+1G>C
Change history MyGeneLog™ keeps a copy of every weekly release from 2026-10-19 and compares them. This position's classification has not changed since.
What this is ClinVar's aggregate record for this position (as of its 2026-10-19 release), not a result about you. A classification describes the variant against the condition named, as laboratories submitted it. Whether a person carries this variant, and what that would mean for them, is a question for a clinical test and a genetic counsellor.
Source: ClinVar VCV000186761, criteria provided, multiple submitters, no conflicts
rs748840480 is a single position in the genome, in or near the ATM gene. Published research associates it with hereditary cancer-predisposing syndrome. A single variant does not decide an outcome — it shifts a probability, and for most common variants the shift is small.
On MyGeneLog this position is linked to Hereditary Cancer-predisposing Syndrome. The research behind each link, and its sources, are set out on that condition page.
ATM carries pharmacogenomic findings for Metformin. That is educational information, not a prescription or a dosing guide. Any decision to start, stop or change a medicine belongs with the clinician or pharmacist managing your treatment.
No. Common variants like this one move a probability slightly and, on their own, rarely decide anything about one person. Nothing on this page is a diagnosis, and health decisions should be made with a clinician who can see your whole picture.
ClinVar VCV000186761, criteria provided, multiple submitters, no conflicts. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.
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Hereditary cancer-predisposing syndrome (rs748840480). MyGeneLog™. https://www.mygenelog.com/variants/rs748840480