Is CCNH p.Ser219Cys (c.656C>G) pathogenic?

CCNH p.Ser219Cys (c.656C>G) is classified Uncertain significance in CCNH (ClinVar, Single submitter, 1 submitter; last evaluated 2022-07-14). AlphaMissense: likely benign (0.0787); Very rare (popmax 0.0011%, sas).

How common is CCNH p.Ser219Cys (c.656C>G) in the general population?

CCNH p.Ser219Cys (c.656C>G) is very rare (popmax 0.0011%, sas) (gnomAD).

What do computational predictors say about CCNH p.Ser219Cys (c.656C>G)?

AlphaMissense predicts likely benign (score 0.0787) — an in-silico prediction, not a clinical call.

CCNH p.Ser219Cys

c.656C>G · rs756773005 · VCV2301884

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0787 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0787	likely benign
REVEL	0.144	moderately benign-leaning
SaProt	LLR -8.26	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 10	GERP 2, phastCons 1
Regional constraint	o/e 0.93	unconstrained · MANE · 18 kb · p 0.18 · regional, not allelic
Overall
CADD	23.5	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/91,062 alleles

Overall 0.000124% 2/1,613,412 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0011%	91,062
European (non-Finnish)	8.48e-05%	1,179,714

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: CCNH
Protein: p.Ser219Cys
Coding: c.656C>G
MANE Select: NM_001239
dbSNP: rs756773005
Type: single nucleotide variant
Location: chr5:87404877 (GRCh38)
Gene constraint: LOEUF 1.05 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 86.26 · 49 PDB
Residue 219: an α-helix

Full CCNH gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

RASA1 p.Ser219= Likely benign ★★ same residue
RASA1 p.Ser219Leu Uncertain significance ★ ⚠ same residue
RASA1 c.1698+1G>A Pathogenic/Likely pathogenic ★★ same type
RASA1 c.2012-2A>G Pathogenic/Likely pathogenic ★★ same type
RASA1 c.2603+1G>A Pathogenic ★★ same type
RASA1 c.2691-1G>T Pathogenic/Likely pathogenic ★★ same type
RASA1 c.2925+1G>T Pathogenic ★★ same type
RASA1 c.899+1G>T Likely pathogenic ★★ 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/ccnh-p-ser219cys (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown