Is CTU2 p.Cys433Ser (c.1298G>C) pathogenic?

CTU2 p.Cys433Ser (c.1298G>C) is classified Conflicting classifications of pathogenicity in CTU2 (ClinVar, Conflicting submitters, 4 submitters; last evaluated 2026-05-07). AlphaMissense: likely benign (0.0995); Rare (popmax 0.196%, sas).

How common is CTU2 p.Cys433Ser (c.1298G>C) in the general population?

CTU2 p.Cys433Ser (c.1298G>C) is rare (popmax 0.196%, sas) (gnomAD).

What do computational predictors say about CTU2 p.Cys433Ser (c.1298G>C)?

AlphaMissense predicts likely benign (score 0.0995) — an in-silico prediction, not a clinical call.

CTU2 p.Cys433Ser

c.1298G>C · rs142662688 · VCV791600

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.0995 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.196%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0995	likely benign
REVEL	0.061	moderately benign-leaning
SaProt	LLR -6.05	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 2.3	GERP -0.72, phastCons 0.3
Regional constraint	o/e 1.61	unconstrained · MANE · 8,717 bp · p 1.9e-57 · regional, not allelic
Overall
CADD	7.921	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 0.196% South Asian · 178/91,046 alleles

Filtering AF 0.172% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.163%

Overall 0.139% 2,240/1,612,224 alleles · rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.196%	511
European (non-Finnish)	0.16%	624
Remaining individualsnot grpmax-eligible	0.12%	833
Finnishnot grpmax-eligible	0.0575%	1,740
Admixed American	0.055%	1,817
Middle Eastern	0.0495%	2,019
African / African-American	0.0307%	3,263

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: CTU2
Protein: p.Cys433Ser
Coding: c.1298G>C
MANE Select: NM_001012759
dbSNP: rs142662688
Type: single nucleotide variant
Location: chr16:88714683 (GRCh38)
Gene constraint: LOEUF 1.535 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 80.27

Full CTU2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CTU2 c.1420-1G>A Likely pathogenic ★★ same type
CTU2 c.282+5G>A Pathogenic ★★ same type
CTU2 p.Gln243Ter Pathogenic/Likely pathogenic ★★ same type
CTU2 p.Thr291= Pathogenic ★★ same type
CTU2 p.Ala176Val Uncertain significance ★★ ⚠ same type
CTU2 p.Ala400Thr Uncertain significance ★★ ⚠ same type
CTU2 p.Arg270Cys Uncertain significance ★★ ⚠ same type
CTU2 p.Arg443Cys 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/ctu2-p-cys433ser (accessed [today's date]).

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