Is EEF1A2 p.Asn307= (c.921C>T) pathogenic?

EEF1A2 p.Asn307= (c.921C>T) is classified Likely benign in EEF1A2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-07-23). Very rare (popmax 0.005%, amr); Associated with developmental and epileptic encephalopathy, 33.

What condition is associated with EEF1A2 p.Asn307= (c.921C>T)?

EEF1A2 p.Asn307= (c.921C>T) is associated with developmental and epileptic encephalopathy, 33 (ClinVar).

How common is EEF1A2 p.Asn307= (c.921C>T) in the general population?

EEF1A2 p.Asn307= (c.921C>T) is very rare (popmax 0.005%, amr) (gnomAD).

EEF1A2 p.Asn307=

Q: How is Non-specific early-onset epileptic encephalopathy inherited?

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

c.921C>T · rs1057522085 · VCV384947

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

very rare (popmax 0.005%, amr)

Conditions

developmental and epileptic encephalopathy, 33

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>C here scores Δ0.30 · evaluated, not missing
Constraint at this position
Conservation	phyloP -7.7	GERP -3.8
Overall
CADD	0.312	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.005% Admixed American · 3/60,014 alleles

Filtering AF 0.00133% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000787%

Overall 0.00149% 24/1,612,694 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.005%	20,005
Remaining individualsnot grpmax-eligible	0.0016%	62,462
European (non-Finnish)	0.00153%	65,554
African / African-American	0.00133%	74,956
South Asian	0.0011%	91,096

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: EEF1A2
Protein: p.Asn307=
Coding: c.921C>T
MANE Select: NM_001958
dbSNP: rs1057522085
Type: single nucleotide variant
Location: chr20:63490587 (GRCh38)
Gene constraint: LOEUF 0.314 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 88.70 · 2 PDB
Residue 307: a β-strand

Full EEF1A2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

developmental and epileptic encephalopathy, 33 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Non-specific early-onset epileptic encephalopathy (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Not applicable
Onset: Infancy, Neonatal

Similar variants

EEF1A2 p.Arg266Trp Pathogenic/Likely pathogenic ★★ same condition
EEF1A2 p.Arg423Cys Pathogenic/Likely pathogenic ★★ same condition
EEF1A2 p.Arg69Cys Pathogenic ★★ same condition
EEF1A2 p.Asp91Asn Pathogenic ★★ same condition
EEF1A2 p.Asp97Asn Pathogenic/Likely pathogenic ★★ same condition
EEF1A2 p.Glu122Lys Pathogenic/Likely pathogenic ★★ same condition
EEF1A2 p.Glu124Lys Pathogenic/Likely pathogenic ★★ same condition
EEF1A2 p.Gly384Arg 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/eef1a2-p-asn307 (accessed [today's date]).

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