Is CFB p.Val434Met (c.1300G>A) pathogenic?

CFB p.Val434Met (c.1300G>A) is classified Uncertain significance in CFB (ClinVar, Single submitter, 1 submitter; last evaluated 2021-12-25). AlphaMissense: ambiguous (0.5008); Absent from gnomAD v4.1.

How common is CFB p.Val434Met (c.1300G>A) in the general population?

CFB p.Val434Met (c.1300G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CFB p.Val434Met (c.1300G>A)?

AlphaMissense predicts ambiguous (score 0.5008) — an in-silico prediction, not a clinical call.

CFB p.Val434Met

c.1300G>A · rs1771622206 · VCV2053063

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.5008 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Computational evidence

Protein change
AlphaMissense	0.5008	ambiguous
REVEL	0.577	indeterminate
SaProt	LLR -8.81	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.9	GERP 1.8, phastCons 1
Overall
CADD	24.1	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

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: CFB
Protein: p.Val434Met
Coding: c.1300G>A
MANE Select: NM_001710
dbSNP: rs1771622206
Type: single nucleotide variant
Location: chr6:31949449 (GRCh38)
Gene constraint: LOEUF 0.719 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 86.54 · 28 PDB
Residue 434: the vwfa domain

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

Similar variants

CFB c.2140-1G>C Uncertain significance ★★ same type
CFB c.-3G>A Uncertain significance ★★ same type
CFB p.Ala162Val Uncertain significance ★★ ⚠ same type
CFB p.Ala289Val Uncertain significance ★★ same type
CFB p.Ala567Gly Uncertain significance ★★ ⚠ same type
CFB p.Arg117Trp Uncertain significance ★★ ⚠ same type
CFB p.Arg138Gln Uncertain significance ★★ ⚠ same type
CFB p.Arg138Trp 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/cfb-p-val434met (accessed [today's date]).

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