Is CHTF18 p.Ala224Pro (c.670G>C) pathogenic?

CHTF18 p.Ala224Pro (c.670G>C) is classified Uncertain significance in CHTF18 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-05-20). AlphaMissense: likely benign (0.1248); Ultra-rare (popmax 0.0236%, amr).

How common is CHTF18 p.Ala224Pro (c.670G>C) in the general population?

CHTF18 p.Ala224Pro (c.670G>C) is ultra-rare (popmax 0.0236%, amr) (gnomAD).

What do computational predictors say about CHTF18 p.Ala224Pro (c.670G>C)?

AlphaMissense predicts likely benign (score 0.1248) — an in-silico prediction, not a clinical call.

CHTF18 p.Ala224Pro

c.670G>C · VCV4002857

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1248 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0236%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1248	likely benign
REVEL	0.181	moderately benign-leaning
SaProt	LLR -6.66	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 -4	GERP -4.4
Regional constraint	o/e 1.43	unconstrained · MANE · 9,287 bp · p 1.1e-58 · regional, not allelic
Overall
CADD	0.127	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 0.0236% Admixed American · 14/59,224 alleles

Filtering AF 0.0143% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.012%

Overall 0.0118% 189/1,606,748 alleles · ultra-rare exomes 164/1,454,534 · genomes 25/152,214 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0236%	4,230
European (non-Finnish)	0.0144%	6,927
Remaining individualsnot grpmax-eligible	0.00482%	20,743
African / African-American	0.00267%	37,394

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: CHTF18
Protein: p.Ala224Pro
Coding: c.670G>C
MANE Select: NM_022092
Type: single nucleotide variant
Location: chr16:790240 (GRCh38)
Gene constraint: LOEUF 1.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.97 · 10 PDB

Full CHTF18 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CHTF18 p.Ala224Thr Uncertain significance ★ ⚠ same residue
CHTF18 p.Ala224Val Uncertain significance ★ ⚠ same residue
CHTF18 p.Ala770= Benign ★★ same type
CHTF18 p.Arg804Cys Benign ★★ same type
CHTF18 p.Asn820= Benign ★★ same type
CHTF18 p.Asp284Glu Benign ★★ same type
CHTF18 p.Glu233Lys Benign ★★ same type
CHTF18 p.His179= Benign ★★ 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/chtf18-p-ala224pro (accessed [today's date]).

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