Is BCOR p.Glu1326= (c.3978A>G) pathogenic?

BCOR p.Glu1326= (c.3978A>G) is classified Likely benign in BCOR (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-05-15). Ultra-rare (popmax 0.013%, nfe); Associated with microphthalmia, syndromic 2.

What condition is associated with BCOR p.Glu1326= (c.3978A>G)?

BCOR p.Glu1326= (c.3978A>G) is associated with microphthalmia, syndromic 2 (ClinVar).

How common is BCOR p.Glu1326= (c.3978A>G) in the general population?

BCOR p.Glu1326= (c.3978A>G) is ultra-rare (popmax 0.013%, nfe) (gnomAD).

BCOR p.Glu1326=

c.3978A>G · rs908375616 · VCV2851120

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.013%, nfe)

Conditions

microphthalmia, syndromic 2

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.008	strongly benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.8	GERP 0.72, phastCons 1
Overall
CADD	8.888	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.013% European (non-Finnish) · 116/889,717 alleles

Filtering AF 0.0111% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0103%

Overall 0.0102% 122/1,200,267 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.013%	7,670
Remaining individualsnot grpmax-eligible	0.0106%	9,445
Ashkenazi Jewishnot grpmax-eligible	0.00456%	21,911

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: BCOR
Protein: p.Glu1326=
Coding: c.3978A>G
MANE Select: NM_001123385
dbSNP: rs908375616
Type: single nucleotide variant
Location: chrX:40062941 (GRCh38)
Structure: AlphaFold pLDDT 39.82 · 5 PDB
Residue 1326: the 'disordered' region

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

Disease context

microphthalmia, syndromic 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

BCOR p.Glu1326fs Likely pathogenic ★ same residue
BCOR p.Arg1163Ter Pathogenic ★★ same condition
BCOR p.Arg1217Ter Pathogenic ★★ same condition
BCOR p.Arg1514Ter Pathogenic ★★ same condition
BCOR p.Arg342Ter Pathogenic ★★ same condition
BCOR p.Arg976Ter Pathogenic ★★ same condition
BCOR p.Ala1262Ser Uncertain significance ★★ ⚠ same condition
BCOR p.Ala1307Pro 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/bcor-p-glu1326 (accessed [today's date]).

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