ERBB2 p.Cys26=
c.78C>T · rs1021403569 · VCV1631403
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00136%, 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 0.41 | GERP -1.9, phastCons 0.99 |
| Overall | ||
| CADD | 10.91 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00136%
African / African-American · 1/73,788 alleles
Filtering AF
8.1e-05%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 5.4e-05%
Overall
0.000316%
5/1,580,532 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.00136% | 73,788 |
| European (non-Finnish) | 0.000344% | 290,675 |
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
- ERBB2
- Protein
- p.Cys26=
- Coding
- c.78C>T
- MANE Select
- NM_004448
- dbSNP
- rs1021403569
- Type
- single nucleotide variant
- Location
- chr17:39706994 (GRCh38)
- Gene constraint
- LOEUF 0.518 · pLI 0.06 (gnomAD)
- Structure
- AlphaFold pLDDT 74.65 · 63 PDB
- Residue 26
- a disulfide bond; a β-strand
Similar variants
- ERBB2 p.Ala598Asp Uncertain significance ★★ ⚠ same type
- ERBB2 p.Ala644Thr Uncertain significance ★★ ⚠ same type
- ERBB2 p.Arg1048Cys Uncertain significance ★★ ⚠ same type
- ERBB2 p.Arg188Cys Uncertain significance ★★ ⚠ same type
- ERBB2 p.Arg188His Uncertain significance ★★ ⚠ same type
- ERBB2 p.Arg190Gln Uncertain significance ★★ ⚠ same type
- ERBB2 p.Arg203His Uncertain significance ★★ ⚠ same type
- ERBB2 p.Arg217Cys 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/erbb2-p-cys26 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown