Is PDGFRB p.Ala773= (c.2319C>T) pathogenic?

PDGFRB p.Ala773= (c.2319C>T) is classified Likely benign in PDGFRB (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-30). Ultra-rare (popmax 0.0164%, mid); Associated with basal ganglia calcification, idiopathic, 4.

How common is PDGFRB p.Ala773= (c.2319C>T) in the general population?

PDGFRB p.Ala773= (c.2319C>T) is ultra-rare (popmax 0.0164%, mid) (gnomAD).

How is Bilateral striopallidodentate calcinosis inherited?

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

PDGFRB p.Ala773=

Q: What condition is associated with PDGFRB p.Ala773= (c.2319C>T)?

PDGFRB p.Ala773= (c.2319C>T) is associated with basal ganglia calcification, idiopathic, 4, acroosteolysis-keloid-like lesions-premature aging syndrome, skeletal overgrowth-craniofacial dysmorphism-hyperelastic skin-white matter lesions syndrome (ClinVar).

c.2319C>T · VCV4787497

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0164%, mid)

Conditions

basal ganglia calcification, idiopathic, 4

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.35	GERP -2.8, phastCons 0.007
Overall
CADD	5.87	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0164% Middle Eastern · 1/6,082 alleles

Filtering AF 0.000875% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000443%

Overall 0.00093% 15/1,613,228 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0164%	6,082
South Asian	0.00329%	30,354
Remaining individualsnot grpmax-eligible	0.0016%	62,470
European (non-Finnish)	0.000848%	117,934

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: PDGFRB
Protein: p.Ala773=
Coding: c.2319C>T
MANE Select: NM_002609
Type: single nucleotide variant
Location: chr5:150121905 (GRCh38)
Gene constraint: LOEUF 0.504 · pLI 0.94 (gnomAD)
Structure: AlphaFold pLDDT 72.96 · 9 PDB
Residue 773: the protein kinase domain

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

Disease context

basal ganglia calcification, idiopathic, 4 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: acroosteolysis-keloid-like lesions-premature aging syndrome skeletal overgrowth-craniofacial dysmorphism-hyperelastic skin-white matter lesions syndrome infantile myofibromatosis

For Bilateral striopallidodentate calcinosis (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Not applicable
Onset: Adult

Similar variants

PDGFRB p.Arg561Cys Pathogenic ★★ ⚠ same condition
PDGFRB p.Asn666His Pathogenic/Likely pathogenic ★★ same condition
PDGFRB p.Asn666Lys Pathogenic/Likely pathogenic ★★ same condition
PDGFRB p.Asn666Ser Pathogenic/Likely pathogenic ★★ same condition
PDGFRB p.Pro560Leu Pathogenic/Likely pathogenic ★★ same condition
PDGFRB p.Pro584Arg Pathogenic ★★ same condition
PDGFRB p.Trp566Arg Pathogenic ★★ same condition
PDGFRB p.Ala513Thr 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/pdgfrb-p-ala773 (accessed [today's date]).

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