Is CHTF18 p.Pro136Ser (c.406C>T) pathogenic?

CHTF18 p.Pro136Ser (c.406C>T) is classified Uncertain significance in CHTF18 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-02). AlphaMissense: likely benign (0.1321); Ultra-rare (popmax 0.028%, nfe).

How common is CHTF18 p.Pro136Ser (c.406C>T) in the general population?

CHTF18 p.Pro136Ser (c.406C>T) is ultra-rare (popmax 0.028%, nfe) (gnomAD).

What do computational predictors say about CHTF18 p.Pro136Ser (c.406C>T)?

AlphaMissense predicts likely benign (score 0.1321) — an in-silico prediction, not a clinical call.

CHTF18 p.Pro136Ser

c.406C>T · rs374144726 · VCV3144843

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1321 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.028%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1321	likely benign
REVEL	0.109	moderately benign-leaning
SaProt	LLR -7.09	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 4.7	GERP 1.1, phastCons 1
Regional constraint	o/e 1.43	unconstrained · MANE · 9,287 bp · p 1.1e-58 · regional, not allelic
Overall
CADD	19.13	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 0.028% European (non-Finnish) · 329/1,175,188 alleles

Filtering AF 0.0255% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0245%

Overall 0.0219% 351/1,602,544 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.028%	3,572
Remaining individualsnot grpmax-eligible	0.0178%	5,633
Middle Eastern	0.0169%	5,934
Admixed American	0.00849%	11,778
Finnishnot grpmax-eligible	0.00485%	20,625
East Asian	0.00224%	44,620
African / African-American	0.00134%	74,698

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.Pro136Ser
Coding: c.406C>T
MANE Select: NM_022092
dbSNP: rs374144726
Type: single nucleotide variant
Location: chr16:789329 (GRCh38)
Gene constraint: LOEUF 1.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.97 · 10 PDB
Residue 136: the 'disordered' region

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

Similar variants

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
CHTF18 p.Leu797= 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-pro136ser (accessed [today's date]).

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