Is F2 p.Arg178= (c.534G>A) pathogenic?

F2 p.Arg178= (c.534G>A) is classified Likely benign in F2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-14). Ultra-rare (popmax 0.0667%, amr); Associated with congenital prothrombin deficiency.

What condition is associated with F2 p.Arg178= (c.534G>A)?

F2 p.Arg178= (c.534G>A) is associated with congenital prothrombin deficiency (ClinVar).

How common is F2 p.Arg178= (c.534G>A) in the general population?

F2 p.Arg178= (c.534G>A) is ultra-rare (popmax 0.0667%, amr) (gnomAD).

How is Congenital factor II deficiency inherited?

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

F2 p.Arg178=

c.534G>A · rs760307675 · VCV1746997

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0667%, amr)

Conditions

congenital prothrombin deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.362	indeterminate
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.6	GERP -0.44, phastCons 1
Overall
CADD	8.852	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0667% Admixed American · 40/59,944 alleles

Filtering AF 0.0503% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0446%

Overall 0.00248% 40/1,613,794 alleles · ultra-rare exomes 32/1,461,458 · genomes 8/152,336 · joint denominator

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: F2
Protein: p.Arg178=
Coding: c.534G>A
MANE Select: NM_000506
dbSNP: rs760307675
Type: single nucleotide variant
Location: chr11:46723493 (GRCh38)
Gene constraint: LOEUF 0.552 · pLI 0.15 (gnomAD)
Structure: AlphaFold pLDDT 84.37 · 480 PDB
Residue 178: the kringle 1 domain; a β-strand

Full F2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

congenital prothrombin deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Congenital factor II deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: <1 / 1 000 000 (Europe)

Similar variants

F2 p.Arg178Met Uncertain significance ★★ same residue
F2 p.Arg461Trp Pathogenic/Likely pathogenic ★★ same condition
F2 p.Arg500Gln Pathogenic ★★ ⚠ same condition
F2 p.Arg581Cys Pathogenic/Likely pathogenic ★★ same condition
F2 p.Arg596Gln Pathogenic ★★ ⚠ same condition
F2 p.Gln387Ter Pathogenic/Likely pathogenic ★★ same condition
F2 c.559+5G>A Uncertain significance ★★ same condition
F2 p.Ala17Ser Uncertain significance ★★ ⚠ 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/f2-p-arg178 (accessed [today's date]).

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