Is CFB p.Asp407= (c.1221C>T) pathogenic?

CFB p.Asp407= (c.1221C>T) is classified Likely benign in CFB (ClinVar, Single submitter, 1 submitter; last evaluated 2023-11-27). Ultra-rare (popmax 0.02%, amr).

How common is CFB p.Asp407= (c.1221C>T) in the general population?

CFB p.Asp407= (c.1221C>T) is ultra-rare (popmax 0.02%, amr) (gnomAD).

CFB p.Asp407=

c.1221C>T · rs750888707 · VCV1923718

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.02%, amr)

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.034	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.1	GERP -4, phastCons 0.47
Overall
CADD	8.337	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.02% Admixed American · 12/60,000 alleles

Filtering AF 0.0115% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00898%

Overall 0.00118% 19/1,614,066 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.02%	5,000
Remaining individualsnot grpmax-eligible	0.0048%	20,829
African / African-American	0.00133%	74,928
European (non-Finnish)	0.000254%	393,348

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: CFB
Protein: p.Asp407=
Coding: c.1221C>T
MANE Select: NM_001710
dbSNP: rs750888707
Type: single nucleotide variant
Location: chr6:31949295 (GRCh38)
Gene constraint: LOEUF 0.719 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 86.54 · 28 PDB
Residue 407: an α-helix; 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-asp407 (accessed [today's date]).

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