Is RBFOX3 p.Val301= (c.903G>A) pathogenic?

RBFOX3 p.Val301= (c.903G>A) is classified Likely benign in RBFOX3 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-06-25). Very rare (popmax 0.00203%, amr); Associated with idiopathic generalized epilepsy.

What condition is associated with RBFOX3 p.Val301= (c.903G>A)?

RBFOX3 p.Val301= (c.903G>A) is associated with idiopathic generalized epilepsy (ClinVar).

How common is RBFOX3 p.Val301= (c.903G>A) in the general population?

RBFOX3 p.Val301= (c.903G>A) is very rare (popmax 0.00203%, amr) (gnomAD).

RBFOX3 p.Val301=

c.903G>A · rs886670631 · VCV1161515

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00203%, amr)

Conditions

idiopathic generalized epilepsy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 1	GERP -1.4, phastCons 1
Overall
CADD	9.827	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00203% Admixed American · 1/49,308 alleles

Filtering AF 0.000261% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000168%

Overall 0.000534% 8/1,498,424 alleles · very rare exomes 4/1,347,716 · genomes 4/150,708 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00203%	49,308
European (non-Finnish)	0.000628%	159,349

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: RBFOX3
Protein: p.Val301=
Coding: c.903G>A
MANE Select: NM_001350451
dbSNP: rs886670631
Type: single nucleotide variant
Location: chr17:79096686 (GRCh38)
Gene constraint: LOEUF 0.605 · pLI 0.60 (gnomAD)
Structure: AlphaFold pLDDT 62.27

Full RBFOX3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

idiopathic generalized epilepsy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

RBFOX3 p.Val301Leu Uncertain significance ★ ⚠ same residue
RBFOX3 p.Val301Ala Uncertain significance ★ ⚠ same residue
RBFOX3 p.Ala316Thr Uncertain significance ★★ ⚠ same condition
RBFOX3 p.Ala62Val Uncertain significance ★★ ⚠ same condition
RBFOX3 p.Ala68Thr Uncertain significance ★★ ⚠ same condition
RBFOX3 p.Ala79Val Uncertain significance ★★ ⚠ same condition
RBFOX3 p.Ala8Thr Uncertain significance ★★ ⚠ same condition
RBFOX3 p.Arg230Trp 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/rbfox3-p-val301 (accessed [today's date]).

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