Is CTCF p.Cys268Arg (c.802T>C) pathogenic?

CTCF p.Cys268Arg (c.802T>C) is classified Uncertain significance in CTCF (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-25). AlphaMissense: likely pathogenic (0.9999); Absent from gnomAD v4.1; Associated with CTCF-related neurodevelopmental disorder.

What condition is associated with CTCF p.Cys268Arg (c.802T>C)?

CTCF p.Cys268Arg (c.802T>C) is associated with CTCF-related neurodevelopmental disorder (ClinVar).

How common is CTCF p.Cys268Arg (c.802T>C) in the general population?

CTCF p.Cys268Arg (c.802T>C) is absent from gnomAD v4.1 (gnomAD).

How is CTCF-related neurodevelopmental disorder inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CTCF p.Cys268Arg (c.802T>C)?

AlphaMissense predicts likely pathogenic (score 0.9999) — an in-silico prediction, not a clinical call.

CTCF p.Cys268Arg

c.802T>C · VCV3776200

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.9999 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

CTCF-related neurodevelopmental disorder

Computational evidence

Protein change
AlphaMissense	0.9999	likely pathogenic · top 6% in CTCF
REVEL	0.726	pathogenic-leaning
SaProt	LLR -15.53	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 2, phastCons 1
Regional constraint	o/e 0.24	constrained · MANE · 10 kb · p 3.4e-38 · regional, not allelic
Overall
CADD	26.2	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CTCF
Protein: p.Cys268Arg
Coding: c.802T>C
MANE Select: NM_006565
Type: single nucleotide variant
Location: chr16:67611971 (GRCh38)
Gene constraint: LOEUF 0.205 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 59.45 · 21 PDB
Residue 268: a UniProt-annotated variant site (found in an endometrial carcinoma sample; uncertain significance)

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

Disease context

CTCF-related neurodevelopmental disorder — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For CTCF-related neurodevelopmental disorder (Orphanet):

Inheritance: Autosomal dominant
Onset: Antenatal, Childhood, Infancy, Neonatal

Similar variants

CTCF p.Cys268_Glu269delinsTer Pathogenic ★ same residue
CTCF c.782-1G>A Pathogenic/Likely pathogenic ★★ same condition
CTCF c.782-1G>C Pathogenic/Likely pathogenic ★★ same condition
CTCF c.782-2A>G Pathogenic/Likely pathogenic ★★ same condition
CTCF c.782-2A>T Pathogenic ★★ same condition
CTCF p.Arg283His Likely pathogenic ★★ same condition
CTCF p.Arg342Cys Pathogenic/Likely pathogenic ★★ same condition
CTCF p.Arg342His Pathogenic/Likely pathogenic ★★ same condition

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/ctcf-p-cys268arg (accessed [today's date]).

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