Is F2 p.Ile311= (c.933C>T) pathogenic?

F2 p.Ile311= (c.933C>T) is classified Likely benign in F2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-04). Very rare (popmax 0.00167%, amr); Associated with congenital prothrombin deficiency.

What condition is associated with F2 p.Ile311= (c.933C>T)?

F2 p.Ile311= (c.933C>T) is associated with congenital prothrombin deficiency (ClinVar).

How common is F2 p.Ile311= (c.933C>T) in the general population?

F2 p.Ile311= (c.933C>T) is very rare (popmax 0.00167%, 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.Ile311=

c.933C>T · rs377529931 · VCV2883620

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

congenital prothrombin deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · C>A here scores Δ0.32 · evaluated, not missing
Constraint at this position
Conservation	phyloP -6.5	GERP -3
Overall
CADD	1.35	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/60,002 alleles

Filtering AF 0.000247% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000159%

Overall 0.000682% 11/1,613,920 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	60,002
Remaining individualsnot grpmax-eligible	0.0016%	62,468
Finnishnot grpmax-eligible	0.00156%	64,004
African / African-American	0.00133%	74,930
European (non-Finnish)	0.000593%	168,564

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.Ile311=
Coding: c.933C>T
MANE Select: NM_000506
dbSNP: rs377529931
Type: single nucleotide variant
Location: chr11:46726556 (GRCh38)
Gene constraint: LOEUF 0.552 · pLI 0.15 (gnomAD)
Structure: AlphaFold pLDDT 84.37 · 480 PDB

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.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
F2 p.Arg124Gln 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-ile311 (accessed [today's date]).

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