Is ALG13 p.Pro921= (c.2763A>C) pathogenic?

ALG13 p.Pro921= (c.2763A>C) is classified Likely benign in ALG13 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-02-01). Ultra-rare (popmax 0.0411%, mid); Associated with developmental and epileptic encephalopathy, 36.

What condition is associated with ALG13 p.Pro921= (c.2763A>C)?

ALG13 p.Pro921= (c.2763A>C) is associated with developmental and epileptic encephalopathy, 36 (ClinVar).

How common is ALG13 p.Pro921= (c.2763A>C) in the general population?

ALG13 p.Pro921= (c.2763A>C) is ultra-rare (popmax 0.0411%, mid) (gnomAD).

How is ALG13-CDG inherited?

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

ALG13 p.Pro921=

c.2763A>C · rs1602887961 · VCV756544

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0411%, mid)

Conditions

developmental and epileptic encephalopathy, 36

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 0.25	GERP -7, phastCons 0.63
Overall
CADD	0.826	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0411% Middle Eastern · 1/2,432 alleles

Filtering AF 0.0115% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0106%

Overall 0.0132% 123/933,217 alleles · ultra-rare exomes 117/846,057 · genomes 6/87,160 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0411%	2,432
Remaining individualsnot grpmax-eligible	0.0239%	4,182
Finnishnot grpmax-eligible	0.0154%	6,501
European (non-Finnish)	0.0137%	7,315
Ashkenazi Jewishnot grpmax-eligible	0.0123%	8,115
East Asian	0.00766%	13,061
South Asian	0.00747%	13,381
African / African-American	0.00687%	14,562
Admixed American	0.00649%	15,404

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: ALG13
Protein: p.Pro921=
Coding: c.2763A>C
MANE Select: NM_001099922
dbSNP: rs1602887961
Type: single nucleotide variant
Location: chrX:111744735 (GRCh38)
Structure: AlphaFold pLDDT 54.42
Residue 921: the 'disordered' region

Full ALG13 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

developmental and epileptic encephalopathy, 36 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For ALG13-CDG (Orphanet):

Inheritance: X-linked recessive
Onset: Infancy, Neonatal

Similar variants

ALG13 p.Asn107Ser Pathogenic/Likely pathogenic ★★ ⚠ same condition
ALG13 c.2458-1G>A Uncertain significance ★★ same condition
ALG13 c.2695+4G>A Uncertain significance ★★ same condition
ALG13 c.2932+6T>C Uncertain significance ★★ same condition
ALG13 c.834+3A>G Uncertain significance ★★ same condition
ALG13 c.932+2T>C Uncertain significance ★★ same condition
ALG13 p.Ala1044Thr Uncertain significance ★★ ⚠ same condition
ALG13 p.Ala173Val 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/alg13-p-pro921 (accessed [today's date]).

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