Is CFTR p.Pro477= (c.1431T>C) pathogenic?

CFTR p.Pro477= (c.1431T>C) is classified Likely benign in CFTR (ClinVar, Single submitter, 1 submitter; last evaluated 2020-09-28). Absent from gnomAD v4.1; Associated with cystic fibrosis.

What condition is associated with CFTR p.Pro477= (c.1431T>C)?

CFTR p.Pro477= (c.1431T>C) is associated with cystic fibrosis (ClinVar).

How common is CFTR p.Pro477= (c.1431T>C) in the general population?

CFTR p.Pro477= (c.1431T>C) is absent from gnomAD v4.1 (gnomAD).

How is Cystic fibrosis inherited?

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

CFTR p.Pro477=

c.1431T>C · rs1799418198 · VCV1772521

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

cystic fibrosis

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.063	GERP -2.7, phastCons 0.98
Overall
CADD	8.858	PHRED · no single calibrated threshold — expert panels disagree

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: CFTR
Protein: p.Pro477=
Coding: c.1431T>C
MANE Select: NM_000492
dbSNP: rs1799418198
Type: single nucleotide variant
Location: chr7:117559502 (GRCh38)
Gene constraint: LOEUF 1.152 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 75.96 · 60 PDB
Residue 477: a UniProt-annotated variant site (in cf); the abc transporter 1 domain

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

Disease context

cystic fibrosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Cystic fibrosis (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

CFTR p.Pro477His Uncertain significance ★★ ⚠ same residue
CFTR p.Pro477Leu Uncertain significance ★★ ⚠ same residue
CFTR p.Pro477Ser Uncertain significance ★★ ⚠ same residue
CFTR p.Pro477Ala Uncertain significance ★ ⚠ same residue
CFTR p.Pro477Thr Uncertain significance ★ ⚠ same residue
CFTR c.1585-1G>A Pathogenic ★★★★ same condition
CFTR c.1766+1G>A Pathogenic ★★★★ same condition
CFTR c.2657+5G>A 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/cftr-p-pro477 (accessed [today's date]).

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