TOP2B p.Phe577=
c.1731C>T · rs370638500 · VCV1623011
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 3 submitters
gnomAD v4.1
Rare
ultra-rare (popmax 0.0857%, afr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP 2.9 | GERP -0.47, phastCons 1 |
| Overall | ||
| CADD | 9.583 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0857%
African / African-American · 64/74,722 alleles
Filtering AF
0.0688%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0627%
Overall
0.00636%
102/1,604,082 alleles · ultra-rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.0857% | 1,168 |
| Admixed American | 0.0378% | 2,647 |
| Middle Eastern | 0.0167% | 6,002 |
| Remaining individualsnot grpmax-eligible | 0.0161% | 6,204 |
| European (non-Finnish) | 0.000425% | 235,262 |
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
- TOP2B
- Protein
- p.Phe577=
- Coding
- c.1731C>T
- MANE Select
- NM_001330700
- dbSNP
- rs370638500
- Type
- single nucleotide variant
- Location
- chr3:25629104 (GRCh38)
- Gene constraint
- LOEUF 0.328 · pLI 1.00 (gnomAD)
- Structure
- AlphaFold pLDDT 74.09 · 21 PDB
- Residue 577
- an α-helix; the toprim domain
Similar variants
- TOP2B p.Ala1290Thr Uncertain significance ★★ ⚠ same type
- TOP2B p.Ala188Gly Uncertain significance ★★ ⚠ same type
- TOP2B p.Ala777Ser Uncertain significance ★★ ⚠ same type
- TOP2B p.Ala890Ser Uncertain significance ★★ ⚠ same type
- TOP2B p.Arg1047Gln Uncertain significance ★★ ⚠ same type
- TOP2B p.Arg1074Cys Uncertain significance ★★ ⚠ same type
- TOP2B p.Arg1171Gln Uncertain significance ★★ ⚠ same type
- TOP2B p.Arg1305Thr 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/top2b-p-phe577 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown