Is CNTNAP2 p.Ser77= (c.231A>G) pathogenic?

CNTNAP2 p.Ser77= (c.231A>G) is classified Likely benign in CNTNAP2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-10-11). Very rare (popmax 0.00223%, eas); Associated with cortical dysplasia-focal epilepsy syndrome.

What condition is associated with CNTNAP2 p.Ser77= (c.231A>G)?

CNTNAP2 p.Ser77= (c.231A>G) is associated with cortical dysplasia-focal epilepsy syndrome (ClinVar).

How common is CNTNAP2 p.Ser77= (c.231A>G) in the general population?

CNTNAP2 p.Ser77= (c.231A>G) is very rare (popmax 0.00223%, eas) (gnomAD).

CNTNAP2 p.Ser77=

Q: How is CNTNAP2-related developmental and epileptic encephalopathy inherited?

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

c.231A>G · rs751347835 · VCV3001879

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Conditions

cortical dysplasia-focal epilepsy syndrome

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 · A>T here scores Δ0.24 · evaluated, not missing
Constraint at this position
Conservation	phyloP -5	GERP -4
Overall
CADD	1.999	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,880 alleles

Overall 6.19e-05% 1/1,614,222 alleles · very rare exomes 1/1,461,874 · genomes 0/152,348 · joint denominator

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: CNTNAP2
Protein: p.Ser77=
Coding: c.231A>G
MANE Select: NM_014141
dbSNP: rs751347835
Type: single nucleotide variant
Location: chr7:146839733 (GRCh38)
Gene constraint: LOEUF 0.721 · pLI <0.01 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 83.81 · 1 PDB
Residue 77: the f5/8 type c domain

Full CNTNAP2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

cortical dysplasia-focal epilepsy syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For CNTNAP2-related developmental and epileptic encephalopathy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy

Similar variants

CNTNAP2 c.1348+1G>A Likely pathogenic ★★ same condition
CNTNAP2 c.3382-2A>C Likely pathogenic ★★ same condition
CNTNAP2 c.97+1G>A Pathogenic/Likely pathogenic ★★ same condition
CNTNAP2 p.Arg1088Ter Pathogenic/Likely pathogenic ★★ same condition
CNTNAP2 p.Arg1095Ter Pathogenic/Likely pathogenic ★★ same condition
CNTNAP2 p.Arg483Ter Pathogenic/Likely pathogenic ★★ same condition
CNTNAP2 p.Gln1111Ter Pathogenic/Likely pathogenic ★★ same condition
CNTNAP2 p.Gln297Ter 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/cntnap2-p-ser77 (accessed [today's date]).

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