Is CSTF2T p.Met423Val (c.1267A>G) pathogenic?

CSTF2T p.Met423Val (c.1267A>G) is classified Uncertain significance in CSTF2T (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-06). AlphaMissense: likely benign (0.0621); Ultra-rare (popmax 0.0329%, mid).

How common is CSTF2T p.Met423Val (c.1267A>G) in the general population?

CSTF2T p.Met423Val (c.1267A>G) is ultra-rare (popmax 0.0329%, mid) (gnomAD).

What do computational predictors say about CSTF2T p.Met423Val (c.1267A>G)?

AlphaMissense predicts likely benign (score 0.0621) — an in-silico prediction, not a clinical call.

CSTF2T p.Met423Val

c.1267A>G · VCV4235368

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0621 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0329%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0621	likely benign
REVEL	0.015	strongly benign-leaning
SaProt	LLR -9.55	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 2.2	GERP 1.9, phastCons 1
Regional constraint	o/e 0.98	unconstrained · MANE · 665 bp · p 0.67 · regional, not allelic
Overall
CADD	18.64	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 0.0329% Middle Eastern · 2/6,084 alleles

Filtering AF 0.0058% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00241%

Overall 0.000434% 7/1,614,014 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0329%	3,042
Remaining individualsnot grpmax-eligible	0.0016%	62,486
European (non-Finnish)	0.000339%	295,003

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: CSTF2T
Protein: p.Met423Val
Coding: c.1267A>G
MANE Select: NM_006258 · reported on NM_015235
Type: single nucleotide variant
Location: chr10:51698283 (GRCh38)

Full CSTF2T gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

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/cstf2t-p-met423val (accessed [today's date]).

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