MCM2 p.Phe678=
c.2034C>T · rs763949869 · VCV2078735
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00553%, sas)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| REVEL | 0.354 | indeterminate |
|---|---|---|
| Splicing | ||
| SpliceAI | <0.2 | no splice effect predicted · four deltas, not one · how we know |
| Constraint at this position | ||
| Conservation | phyloP -3.6 | GERP -4.2 |
| Overall | ||
| CADD | 6.546 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00553%
South Asian · 5/90,448 alleles
Filtering AF
0.00344%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00311%
Overall
0.00367%
59/1,605,804 alleles · very rare
exomes 58/1,453,588 · genomes 1/152,216 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| South Asiangrpmax | 0.00553% | 18,090 |
| European (non-Finnish) | 0.00443% | 22,587 |
| Remaining individualsnot grpmax-eligible | 0.00322% | 31,044 |
Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.
Variant & gene context
- Gene
- MCM2
- Protein
- p.Phe678=
- Coding
- c.2034C>T
- MANE Select
- NM_004526
- dbSNP
- rs763949869
- Type
- single nucleotide variant
- Location
- chr3:127619047 (GRCh38)
- Gene constraint
- LOEUF 0.706 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 76.54 · 39 PDB
- Residue 678
- an α-helix; the mcm c-terminal aaa(+) atpase domain
Similar variants
- MCM2 p.Ala148Thr Uncertain significance ★★ ⚠ same type
- MCM2 p.Ala2Glu Uncertain significance ★★ ⚠ same type
- MCM2 p.Ala400Thr Uncertain significance ★★ ⚠ same type
- MCM2 p.Arg126Gln Uncertain significance ★★ ⚠ same type
- MCM2 p.Arg149His Uncertain significance ★★ ⚠ same type
- MCM2 p.Arg152His Uncertain significance ★★ ⚠ same type
- MCM2 p.Arg227His Uncertain significance ★★ ⚠ same type
- MCM2 p.Arg284Cys Uncertain significance ★★ ⚠ same type
Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →
Cite Sugi Variant
Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/mcm2-p-phe678 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown