Is SCN2A p.Phe207Ser (c.620T>C) pathogenic?

SCN2A p.Phe207Ser (c.620T>C) is classified Likely pathogenic in SCN2A (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-03-25). AlphaMissense: likely pathogenic (0.9576); Absent from gnomAD v4.1; Associated with seizures, benign familial infantile, 3.

What condition is associated with SCN2A p.Phe207Ser (c.620T>C)?

SCN2A p.Phe207Ser (c.620T>C) is associated with seizures, benign familial infantile, 3, episodic ataxia, type 9 (ClinVar).

How common is SCN2A p.Phe207Ser (c.620T>C) in the general population?

SCN2A p.Phe207Ser (c.620T>C) is absent from gnomAD v4.1 (gnomAD).

How is Self-limited neonatal-infantile epilepsy inherited?

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

What do computational predictors say about SCN2A p.Phe207Ser (c.620T>C)?

AlphaMissense predicts likely pathogenic (score 0.9576) — an in-silico prediction, not a clinical call.

SCN2A p.Phe207Ser

c.620T>C · rs1064796691 · VCV976279

Likely pathogenic Multiple submitters

Classification

Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.9576 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

seizures, benign familial infantile, 3

Computational evidence

Protein change
AlphaMissense	0.9576	likely pathogenic ✓ concordant with ClinVar
REVEL	0.939	strongly pathogenic-leaning
SaProt	LLR -16.11	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 2, phastCons 1
Regional constraint	o/e 0.24	constrained · MANE · 2,558 bp · p 2.7e-21 · regional, not allelic
Overall
CADD	28.1	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

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: SCN2A
Protein: p.Phe207Ser
Coding: c.620T>C
MANE Select: NM_001040142
dbSNP: rs1064796691
Type: single nucleotide variant
Location: chr2:165309366 (GRCh38)
Gene constraint: LOEUF 0.161 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 69.28 · 5 PDB
Residue 207: a UniProt-annotated variant site (found in a patient with intractable epilepsy and severe mental decline; likely pathogenic; non-conducting; loss of voltage-gated sodium channel activity; dominant-negative); a UniProt-annotated variant site (found in a patient with schizofrenia; uncertain significance); a β-strand

Full SCN2A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

seizures, benign familial infantile, 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: episodic ataxia, type 9

For Self-limited neonatal-infantile epilepsy (Orphanet):

Inheritance: Autosomal dominant
Onset: Infancy, Neonatal

Similar variants

SCN2A p.Phe207Cys Likely pathogenic ★ same residue
SCN2A p.Ala1773Thr Pathogenic ★★★ same condition
SCN2A p.Arg220Gly Likely pathogenic ★★★ same condition
SCN2A p.Arg853Gln Pathogenic ★★★ same condition
SCN2A p.Gly899Asp Likely pathogenic ★★★ same condition
SCN2A p.Leu886Ser Likely pathogenic ★★★ same condition
SCN2A p.Lys1260Glu Likely pathogenic ★★★ same condition
SCN2A p.Lys156Gln 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/scn2a-p-phe207ser (accessed [today's date]).

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