Is CCDC27 p.Pro637Ala (c.1909C>G) pathogenic?

CCDC27 p.Pro637Ala (c.1909C>G) is classified Uncertain significance in CCDC27 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-05). AlphaMissense: likely benign (0.1321); Absent from gnomAD v4.1.

How common is CCDC27 p.Pro637Ala (c.1909C>G) in the general population?

CCDC27 p.Pro637Ala (c.1909C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CCDC27 p.Pro637Ala (c.1909C>G)?

AlphaMissense predicts likely benign (score 0.1321) — an in-silico prediction, not a clinical call.

CCDC27 p.Pro637Ala

c.1909C>G · VCV4221131

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1321 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1321	likely benign
REVEL	0.099	moderately benign-leaning
SaProt	LLR -2.53	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 3.1	GERP 1.9, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 19 kb · p 0.84 · regional, not allelic
Overall
CADD	15.9	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

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: CCDC27
Protein: p.Pro637Ala
Coding: c.1909C>G
MANE Select: NM_152492
Type: single nucleotide variant
Location: chr1:3771461 (GRCh38)
Gene constraint: LOEUF 1.234 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 66.70

Full CCDC27 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CCDC27 p.Pro637Arg Uncertain significance ★ ⚠ same residue
CCDC27 p.Ala112Pro Uncertain significance ★ ⚠ same type
CCDC27 p.Ala112Val Uncertain significance ★ ⚠ same type
CCDC27 p.Ala153Val Uncertain significance ★ ⚠ same type
CCDC27 p.Ala293Thr Uncertain significance ★ ⚠ same type
CCDC27 p.Ala324Val Uncertain significance ★ ⚠ same type
CCDC27 p.Ala574Val Uncertain significance ★ ⚠ same type
CCDC27 p.Ala78Asp 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/ccdc27-p-pro637ala (accessed [today's date]).

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