Is CHTF18 p.His637Arg (c.1910A>G) pathogenic?

CHTF18 p.His637Arg (c.1910A>G) is classified Uncertain significance in CHTF18 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-07). AlphaMissense: likely benign (0.0679); Ultra-rare (popmax 0.0313%, nfe).

How common is CHTF18 p.His637Arg (c.1910A>G) in the general population?

CHTF18 p.His637Arg (c.1910A>G) is ultra-rare (popmax 0.0313%, nfe) (gnomAD).

What do computational predictors say about CHTF18 p.His637Arg (c.1910A>G)?

AlphaMissense predicts likely benign (score 0.0679) — an in-silico prediction, not a clinical call.

CHTF18 p.His637Arg

c.1910A>G · VCV3833326

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0679 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0313%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0679	likely benign
REVEL	0.056	moderately benign-leaning
SaProt	LLR -6.68	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 1.2	GERP -2.6, phastCons 0.11
Regional constraint	o/e 1.43	unconstrained · MANE · 9,287 bp · p 1.1e-58 · regional, not allelic
Overall
CADD	7.588	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 0.0313% European (non-Finnish) · 369/1,179,670 alleles

Filtering AF 0.0286% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0276%

Overall 0.0251% 405/1,612,244 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0313%	3,197
South Asian	0.0275%	3,643
Remaining individualsnot grpmax-eligible	0.0112%	8,918
Finnishnot grpmax-eligible	0.00319%	31,362
African / African-American	0.00267%	37,454

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.His637Arg
Coding: c.1910A>G
MANE Select: NM_022092
Type: single nucleotide variant
Location: chr16:794161 (GRCh38)
Gene constraint: LOEUF 1.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.97 · 10 PDB
Residue 637: an α-helix

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

Similar variants

CHTF18 p.His637Leu 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
CHTF18 p.Leu541= 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-his637arg (accessed [today's date]).

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