Is CYTH4 p.Gly343Ser (c.1027G>A) pathogenic?

CYTH4 p.Gly343Ser (c.1027G>A) is classified Uncertain significance in CYTH4 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-27). AlphaMissense: ambiguous (0.4136); Very rare (popmax 0.00178%, nfe).

How common is CYTH4 p.Gly343Ser (c.1027G>A) in the general population?

CYTH4 p.Gly343Ser (c.1027G>A) is very rare (popmax 0.00178%, nfe) (gnomAD).

What do computational predictors say about CYTH4 p.Gly343Ser (c.1027G>A)?

AlphaMissense predicts ambiguous (score 0.4136) — an in-silico prediction, not a clinical call.

CYTH4 p.Gly343Ser

c.1027G>A · VCV4658285

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4136 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00178%, nfe)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense indeterminate

Computational evidence

Protein change
AlphaMissense	0.4136	ambiguous
REVEL	0.668	pathogenic-leaning
SaProt	LLR -9.23	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.1, phastCons 1
Regional constraint	o/e 0.78	unconstrained · MANE · 31 kb · p 5.9e-07 · regional, not allelic
Overall
CADD	26.2	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00178% European (non-Finnish) · 21/1,180,048 alleles

Filtering AF 0.00114% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00097%

Overall 0.00149% 24/1,614,060 alleles · very rare exomes 22/1,461,880 · genomes 2/152,180 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00178%	56,193
Remaining individualsnot grpmax-eligible	0.0016%	62,486
African / African-American	0.00133%	74,912
South Asian	0.0011%	91,088

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: CYTH4
Protein: p.Gly343Ser
Coding: c.1027G>A
MANE Select: NM_013385
Type: single nucleotide variant
Location: chr22:37312089 (GRCh38)
Gene constraint: LOEUF 0.516 · pLI 0.94 (gnomAD)
Structure: AlphaFold pLDDT 87.17
Residue 343: the ph domain

Full CYTH4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CYTH4 p.Asn107His Benign ★★ ⚠ same type
CYTH4 p.Leu88= Benign ★★ same type
CYTH4 p.Met74Val Benign ★★ same type
CYTH4 p.Ala136Thr Uncertain significance ★ ⚠ same type
CYTH4 p.Ala166Val Uncertain significance ★ ⚠ same type
CYTH4 p.Ala9Glu Uncertain significance ★ ⚠ same type
CYTH4 p.Arg205Gln Uncertain significance ★ ⚠ same type
CYTH4 p.Arg212Cys Uncertain significance ★ ⚠ 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/cyth4-p-gly343ser (accessed [today's date]).

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