Is CTCFL p.Pro426Ala (c.1276C>G) pathogenic?

CTCFL p.Pro426Ala (c.1276C>G) is classified Uncertain significance in CTCFL (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-19). AlphaMissense: likely benign (0.255); Very rare (popmax 0.00339%, nfe).

How common is CTCFL p.Pro426Ala (c.1276C>G) in the general population?

CTCFL p.Pro426Ala (c.1276C>G) is very rare (popmax 0.00339%, nfe) (gnomAD).

What do computational predictors say about CTCFL p.Pro426Ala (c.1276C>G)?

AlphaMissense predicts likely benign (score 0.255) — an in-silico prediction, not a clinical call.

CTCFL p.Pro426Ala

c.1276C>G · VCV3270028

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.255 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00339%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.255	likely benign
REVEL	0.182	moderately benign-leaning
SaProt	LLR -10.41	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.3	GERP -0.86, phastCons 1
Regional constraint	o/e 0.76	unconstrained · MANE · 11 kb · p 1.2e-05 · regional, not allelic
Overall
CADD	21.9	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 0.00339% European (non-Finnish) · 40/1,180,030 alleles

Filtering AF 0.00255% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00225%

Overall 0.00254% 41/1,614,018 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00339%	29,501
Admixed American	0.00167%	59,998

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: CTCFL
Protein: p.Pro426Ala
Coding: c.1276C>G
MANE Select: NM_001386993
Type: single nucleotide variant
Location: chr20:57514646 (GRCh38)
Gene constraint: LOEUF 0.669 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 55.75

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

Similar variants

CTCFL p.Ser172= Benign ★★ same type
CTCFL p.Val652Met Benign ★★ same type
CTCFL p.Ala155Ser Uncertain significance ★ ⚠ same type
CTCFL p.Ala155Thr Uncertain significance ★ ⚠ same type
CTCFL p.Ala253Thr Uncertain significance ★ ⚠ same type
CTCFL p.Ala321Thr Uncertain significance ★ ⚠ same type
CTCFL p.Ala434Thr Uncertain significance ★ ⚠ same type
CTCFL p.Ala438Thr 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/ctcfl-p-pro426ala (accessed [today's date]).

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