Is SYN1 p.Glu305Lys (c.913G>A) pathogenic?

SYN1 p.Glu305Lys (c.913G>A) is classified Uncertain significance in SYN1 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-10-17). AlphaMissense: likely pathogenic (0.9982); No allele count reported in gnomAD v4.1 (AN 1,211,526); Associated with epilepsy, X-linked 1, with variable learning disabilities and behavior disorders.

What condition is associated with SYN1 p.Glu305Lys (c.913G>A)?

SYN1 p.Glu305Lys (c.913G>A) is associated with epilepsy, X-linked 1, with variable learning disabilities and behavior disorders (ClinVar).

How common is SYN1 p.Glu305Lys (c.913G>A) in the general population?

SYN1 p.Glu305Lys (c.913G>A) is no allele count reported in gnomAD v4.1 (AN 1,211,526) (gnomAD).

What do computational predictors say about SYN1 p.Glu305Lys (c.913G>A)?

AlphaMissense predicts likely pathogenic (score 0.9982) — an in-silico prediction, not a clinical call.

SYN1 p.Glu305Lys

Q: How is X-linked epilepsy-learning disabilities-behavior disorders syndrome inherited?

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

c.913G>A · rs2519686956 · VCV2100312

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

0.9982 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,211,526)

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

epilepsy, X-linked 1, with variable learning disabilities and behavior disorders

Computational evidence

Protein change
AlphaMissense	0.9982	likely pathogenic · top 5% in SYN1
REVEL	0.492	indeterminate
SaProt	LLR -13.79	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	phastCons 1
Regional constraint	o/e 0.70	unconstrained · MANE · 45 kb · p 1.4e-10 · regional, not allelic
Overall
CADD	28.7	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

No allele count reported in gnomAD v4.1 (AN 1,211,526). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: SYN1
Protein: p.Glu305Lys
Coding: c.913G>A
MANE Select: NM_006950
dbSNP: rs2519686956
Type: single nucleotide variant
Location: chrX:47576565 (GRCh38)
Structure: AlphaFold pLDDT 69.86
Residue 305: the 'c; actin-binding and synaptic-vesicle binding' region

Full SYN1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

epilepsy, X-linked 1, with variable learning disabilities and behavior disorders — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For X-linked epilepsy-learning disabilities-behavior disorders syndrome (Orphanet):

Inheritance: X-linked recessive
Onset: Childhood

Similar variants

SYN1 c.528-2A>T Pathogenic/Likely pathogenic ★★ same condition
SYN1 c.838-2A>G Likely pathogenic ★★ same condition
SYN1 p.Arg234Ter Pathogenic ★★ same condition
SYN1 p.Arg420Gln Likely pathogenic ★★ ⚠ same condition
SYN1 p.Arg422Ter Pathogenic ★★ same condition
SYN1 p.Gln483Ter Pathogenic ★★ same condition
SYN1 p.Gln555Ter Pathogenic ★★ same condition
SYN1 p.Glu121Ter 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/syn1-p-glu305lys (accessed [today's date]).

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