Is RELN p.Cys126= (c.378C>T) pathogenic?

RELN p.Cys126= (c.378C>T) is classified Likely benign in RELN (ClinVar, Single submitter, 1 submitter; last evaluated 2019-12-04). Very rare (popmax 0.00237%, nfe); Associated with Norman-Roberts syndrome.

What condition is associated with RELN p.Cys126= (c.378C>T)?

RELN p.Cys126= (c.378C>T) is associated with Norman-Roberts syndrome, familial temporal lobe epilepsy 7 (ClinVar).

How common is RELN p.Cys126= (c.378C>T) in the general population?

RELN p.Cys126= (c.378C>T) is very rare (popmax 0.00237%, nfe) (gnomAD).

RELN p.Cys126=

c.378C>T · rs576903015 · VCV1081246

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00237%, nfe)

Conditions

Norman-Roberts syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.6	GERP -1.3, phastCons 1
Overall
CADD	9.997	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00237% European (non-Finnish) · 28/1,179,502 alleles

Filtering AF 0.00165% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00142%

Overall 0.00186% 30/1,613,376 alleles · very rare exomes 27/1,461,224 · genomes 3/152,152 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00237%	42,125
Remaining individualsnot grpmax-eligible	0.0016%	62,462
African / African-American	0.00133%	74,918

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: RELN
Protein: p.Cys126=
Coding: c.378C>T
MANE Select: NM_005045
dbSNP: rs576903015
Type: single nucleotide variant
Location: chr7:103833632 (GRCh38)
Gene constraint: LOEUF 0.276 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Residue 126: the reelin domain; a disulfide bond

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

Disease context

Norman-Roberts syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: familial temporal lobe epilepsy 7

Similar variants

RELN c.3912+2T>G Likely pathogenic ★★ same condition
RELN c.7349+2T>C Likely pathogenic ★★ same condition
RELN p.Arg1622Ter Pathogenic/Likely pathogenic ★★ same condition
RELN c.1893-3C>T Uncertain significance ★★ same condition
RELN c.227-3C>T Uncertain significance ★★ same condition
RELN c.2465+5G>T Uncertain significance ★★ same condition
RELN c.6072+3A>G Uncertain significance ★★ same condition
RELN c.6072+4C>G 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/reln-p-cys126 (accessed [today's date]).

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