Is PROC p.Thr296= (c.888C>T) pathogenic?

PROC p.Thr296= (c.888C>T) is classified Conflicting classifications of pathogenicity in PROC (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2025-08-29). Ultra-rare (popmax 0.025%, amr); Associated with thrombophilia due to protein C deficiency, autosomal dominant.

What condition is associated with PROC p.Thr296= (c.888C>T)?

PROC p.Thr296= (c.888C>T) is associated with thrombophilia due to protein C deficiency, autosomal dominant (ClinVar).

How common is PROC p.Thr296= (c.888C>T) in the general population?

PROC p.Thr296= (c.888C>T) is ultra-rare (popmax 0.025%, amr) (gnomAD).

PROC p.Thr296=

Q: How is Severe hereditary thrombophilia due to congenital protein C deficiency inherited?

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

c.888C>T · rs759229398 · VCV893933

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.025%, amr)

Conditions

thrombophilia due to protein C deficiency, autosomal dominant

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.25	benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -14
Overall
CADD	0.243	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.025% Admixed American · 15/60,016 alleles

Filtering AF 0.0154% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0124%

Overall 0.00192% 31/1,614,064 alleles · ultra-rare exomes 30/1,461,828 · genomes 1/152,236 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.025%	4,001
Middle Eastern	0.0164%	6,084
South Asian	0.00878%	11,386
East Asian	0.00223%	44,894
Remaining individualsnot grpmax-eligible	0.0016%	62,488
African / African-American	0.00133%	74,948
European (non-Finnish)	0.000339%	295,011

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: PROC
Protein: p.Thr296=
Coding: c.888C>T
MANE Select: NM_000312
dbSNP: rs759229398
Type: single nucleotide variant
Location: chr2:127428448 (GRCh38)
Gene constraint: LOEUF 0.894 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 82.35 · 12 PDB
Residue 296: the peptidase s1 domain

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

Disease context

thrombophilia due to protein C deficiency, autosomal dominant — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Severe hereditary thrombophilia due to congenital protein C deficiency (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Neonatal
Prevalence: 1-9 / 1 000 000 (Worldwide)

Similar variants

PROC p.Ala309Thr Pathogenic/Likely pathogenic ★★ ⚠ same condition
PROC p.Arg199Ter Pathogenic ★★ same condition
PROC p.Arg211Gln Pathogenic/Likely pathogenic ★★ ⚠ same condition
PROC p.Arg211Trp Pathogenic/Likely pathogenic ★★ ⚠ same condition
PROC p.Arg220Gln Pathogenic/Likely pathogenic ★★ ⚠ same condition
PROC p.Arg220Trp Pathogenic/Likely pathogenic ★★ ⚠ same condition
PROC p.Arg271Trp Pathogenic/Likely pathogenic ★★ same condition
PROC p.Arg272Cys Pathogenic/Likely pathogenic ★★ 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/proc-p-thr296 (accessed [today's date]).

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