Is C6 p.Arg445Ter (c.1333C>T) pathogenic?

C6 p.Arg445Ter (c.1333C>T) is classified Likely pathogenic in C6 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-03-22). Very rare (popmax 0.0039%, nfe).

How common is C6 p.Arg445Ter (c.1333C>T) in the general population?

C6 p.Arg445Ter (c.1333C>T) is very rare (popmax 0.0039%, nfe) (gnomAD).

C6 p.Arg445Ter

c.1333C>T · rs778044260 · VCV1678056

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.0039%, nfe)

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 10 of 18
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Pangolin	Δ0.20	loss · gain 0.00 · not in the SpliceAI release · independent
Constraint at this position
Conservation	phyloP 4.4	GERP -2.2, phastCons 0.94
Overall
CADD	36.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0039% European (non-Finnish) · 46/1,179,652 alleles

Filtering AF 0.00299% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00267%

Overall 0.00316% 51/1,613,370 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0039%	25,645
Remaining individualsnot grpmax-eligible	0.0032%	31,223
African / African-American	0.00267%	37,424
South Asian	0.0011%	91,072

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: C6
Protein: p.Arg445Ter
Coding: c.1333C>T
MANE Select: NM_000065
dbSNP: rs778044260
Type: single nucleotide variant
Location: chr5:41161818 (GRCh38)
Gene constraint: LOEUF 1.008 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.72 · 11 PDB
Residue 445: a β-strand; the macpf domain

Full C6 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C6 p.Arg445Gln Conflicting classifications of pathogenicity ★ ⚠ same residue
C6 p.Arg596Ter Pathogenic/Likely pathogenic ★★ same type
C6 p.Arg606Ter Pathogenic ★★ same type
C6 p.Cys218Ter Pathogenic/Likely pathogenic ★★ same type
C6 p.Tyr683Ter Pathogenic/Likely pathogenic ★★ same type
C6 p.Ala21Val Uncertain significance ★★ ⚠ same type
C6 p.Ala396Gly Uncertain significance ★★ ⚠ same type
C6 p.Ala456Thr 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/c6-p-arg445ter (accessed [today's date]).

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