Is FGR p.Ser443Pro (c.1327T>C) pathogenic?

FGR p.Ser443Pro (c.1327T>C) is classified Uncertain significance in FGR (ClinVar, Single submitter, 1 submitter; last evaluated 2022-06-24). AlphaMissense: likely pathogenic (0.9727); Absent from gnomAD v4.1.

How common is FGR p.Ser443Pro (c.1327T>C) in the general population?

FGR p.Ser443Pro (c.1327T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about FGR p.Ser443Pro (c.1327T>C)?

AlphaMissense predicts likely pathogenic (score 0.9727) — an in-silico prediction, not a clinical call.

FGR p.Ser443Pro

c.1327T>C · rs2523223964 · VCV2296253

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9727 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.9727	likely pathogenic · top 9% in FGR
REVEL	0.516	indeterminate
SaProt	LLR -16.24	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 2.3, phastCons 1
Regional constraint	o/e 0.74	unconstrained · MANE · 11 kb · p 7.9e-12 · regional, not allelic
Overall
CADD	28.8	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: FGR
Protein: p.Ser443Pro
Coding: c.1327T>C
MANE Select: NM_005248
dbSNP: rs2523223964
Type: single nucleotide variant
Location: chr1:27613273 (GRCh38)
Gene constraint: LOEUF 0.556 · pLI 0.50 (gnomAD)
Structure: AlphaFold pLDDT 83.00 · 7 PDB
Residue 443: the protein kinase domain; an α-helix

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

Similar variants

FGR c.533-8C>G Benign ★★ same type
FGR p.Asp254= Benign ★★ same type
FGR p.Ser122= Benign ★★ same type
FGR p.Ala30Thr Uncertain significance ★ ⚠ same type
FGR p.Ala395Thr Uncertain significance ★ ⚠ same type
FGR p.Ala60Thr Uncertain significance ★ ⚠ same type
FGR p.Ala60Val Uncertain significance ★ ⚠ same type
FGR p.Arg384Lys Uncertain significance ★ ⚠ same type

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/fgr-p-ser443pro (accessed [today's date]).

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