Is THBD p.Pro300Ser (c.898C>T) pathogenic?

THBD p.Pro300Ser (c.898C>T) is classified Uncertain significance in THBD (ClinVar, Multiple submitters, 2 submitters; last evaluated 2022-06-03). AlphaMissense: likely benign (0.0804); Very rare (popmax 0.0011%, nfe); Associated with thrombomodulin-related bleeding disorder.

What condition is associated with THBD p.Pro300Ser (c.898C>T)?

THBD p.Pro300Ser (c.898C>T) is associated with thrombomodulin-related bleeding disorder, atypical hemolytic-uremic syndrome with thrombomodulin anomaly (ClinVar).

How common is THBD p.Pro300Ser (c.898C>T) in the general population?

THBD p.Pro300Ser (c.898C>T) is very rare (popmax 0.0011%, nfe) (gnomAD).

How is Thrombomodulin-related bleeding disorder inherited?

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

What do computational predictors say about THBD p.Pro300Ser (c.898C>T)?

AlphaMissense predicts likely benign (score 0.0804) — an in-silico prediction, not a clinical call.

THBD p.Pro300Ser

c.898C>T · rs199987510 · VCV1363660

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0804 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0011%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

thrombomodulin-related bleeding disorder

Computational evidence

Protein change
AlphaMissense	0.0804	likely benign
REVEL	0.1	moderately benign-leaning
SaProt	LLR -8.62	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -2.1	GERP -3.2
Regional constraint	o/e 1.04	unconstrained · MANE · 1,724 bp · p 0.25 · regional, not allelic
Overall
CADD	0.191	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% European (non-Finnish) · 13/1,179,486 alleles

Filtering AF 0.000615% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000474%

Overall 0.000876% 14/1,598,334 alleles · very rare exomes 9/1,446,068 · genomes 5/152,266 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0011%	90,729
South Asian	0.0011%	90,904

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: THBD
Protein: p.Pro300Ser
Coding: c.898C>T
MANE Select: NM_000361
dbSNP: rs199987510
Type: single nucleotide variant
Location: chr20:23048607 (GRCh38)
Gene constraint: LOEUF 1.938 · pLI 0.05 (gnomAD)
Structure: AlphaFold pLDDT 79.35 · 13 PDB
Residue 300: the egf-like 2 domain

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

Disease context

thrombomodulin-related bleeding disorder — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: atypical hemolytic-uremic syndrome with thrombomodulin anomaly

For Thrombomodulin-related bleeding disorder (Orphanet):

Inheritance: Autosomal dominant
Onset: All ages

Similar variants

THBD p.Pro300Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
THBD p.Pro300= Uncertain significance ★ same residue
THBD p.Cys537Ter Pathogenic/Likely pathogenic ★★ same condition
THBD p.Ala139Ser Uncertain significance ★★ ⚠ same condition
THBD p.Ala271Thr Uncertain significance ★★ ⚠ same condition
THBD p.Ala284Gly Uncertain significance ★★ ⚠ same condition
THBD p.Ala395Val Uncertain significance ★★ ⚠ same condition
THBD p.Ala471Thr 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/thbd-p-pro300ser (accessed [today's date]).

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