Is STRADA p.His276Arg (c.827A>G) pathogenic?

STRADA p.His276Arg (c.827A>G) is classified Uncertain significance in STRADA (ClinVar, Single submitter, 1 submitter; last evaluated 2019-08-30). AlphaMissense: ambiguous (0.522); Very rare (popmax 8.48e-05%, nfe); Associated with polyhydramnios, megalencephaly, and symptomatic epilepsy.

What condition is associated with STRADA p.His276Arg (c.827A>G)?

STRADA p.His276Arg (c.827A>G) is associated with polyhydramnios, megalencephaly, and symptomatic epilepsy (ClinVar).

How common is STRADA p.His276Arg (c.827A>G) in the general population?

STRADA p.His276Arg (c.827A>G) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

What do computational predictors say about STRADA p.His276Arg (c.827A>G)?

AlphaMissense predicts ambiguous (score 0.522) — an in-silico prediction, not a clinical call.

STRADA p.His276Arg

Q: How is Polyhydramnios-megalencephaly-symptomatic epilepsy syndrome inherited?

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

c.827A>G · rs753176642 · VCV942436

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.522 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

Conditions

polyhydramnios, megalencephaly, and symptomatic epilepsy

Computational evidence

Protein change
AlphaMissense	0.522	ambiguous
REVEL	0.396	indeterminate
SaProt	LLR -5.71	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.2	GERP 1.8, phastCons 1
Regional constraint	o/e 0.81	unconstrained · MANE · 25 kb · p 5.3e-06 · regional, not allelic
Overall
CADD	23.8	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,886 alleles

Overall 6.84e-05% 1/1,461,682 alleles · very rare

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: STRADA
Protein: p.His276Arg
Coding: c.827A>G
MANE Select: NM_001003787
dbSNP: rs753176642
Type: single nucleotide variant
Location: chr17:63706666 (GRCh38)
Gene constraint: LOEUF 0.649 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 80.46 · 4 PDB
Residue 276: the protein kinase domain

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

Disease context

polyhydramnios, megalencephaly, and symptomatic epilepsy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Polyhydramnios-megalencephaly-symptomatic epilepsy syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Antenatal, Infancy, Neonatal

Similar variants

STRADA c.36+1G>A Likely pathogenic ★★ same condition
STRADA c.37-1G>C Likely pathogenic ★★ same condition
STRADA p.Arg228Ter Pathogenic ★★ same condition
STRADA p.Ala45Val Uncertain significance ★★ ⚠ same condition
STRADA p.Arg100Gln Uncertain significance ★★ ⚠ same condition
STRADA p.Arg13Gln Uncertain significance ★★ same condition
STRADA p.Arg13Leu Uncertain significance ★★ ⚠ same condition
STRADA p.Arg13Trp 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/strada-p-his276arg (accessed [today's date]).

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