Is COG1 p.Arg831Gln (c.2492G>A) pathogenic?

COG1 p.Arg831Gln (c.2492G>A) is classified Uncertain significance in COG1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-05-17). AlphaMissense: likely benign (0.0825); Ultra-rare (popmax 0.0512%, eas); Associated with COG1-congenital disorder of glycosylation.

What condition is associated with COG1 p.Arg831Gln (c.2492G>A)?

COG1 p.Arg831Gln (c.2492G>A) is associated with COG1-congenital disorder of glycosylation (ClinVar).

How common is COG1 p.Arg831Gln (c.2492G>A) in the general population?

COG1 p.Arg831Gln (c.2492G>A) is ultra-rare (popmax 0.0512%, eas) (gnomAD).

How is COG1-CDG inherited?

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

What do computational predictors say about COG1 p.Arg831Gln (c.2492G>A)?

AlphaMissense predicts likely benign (score 0.0825) — an in-silico prediction, not a clinical call.

COG1 p.Arg831Gln

c.2492G>A · rs778718320 · VCV2140781

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0825 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0512%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

COG1-congenital disorder of glycosylation

Computational evidence

Protein change
AlphaMissense	0.0825	likely benign
REVEL	0.14	moderately benign-leaning
SaProt	LLR -5.74	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Pangolin	Δ0.22	loss · gain 0.02 · not in the SpliceAI release · independent
Constraint at this position
Conservation	phyloP 7.4	GERP 0.69, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 15 kb · p 0.052 · regional, not allelic
Overall
CADD	27.5	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0512% East Asian · 23/44,904 alleles

Filtering AF 0.035% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0296%

Overall 0.0031% 50/1,613,756 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0512%	1,952
Middle Eastern	0.0511%	1,956
South Asian	0.0022%	45,537
European (non-Finnish)	0.00178%	56,191
Remaining individualsnot grpmax-eligible	0.0016%	62,450

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: COG1
Protein: p.Arg831Gln
Coding: c.2492G>A
MANE Select: NM_018714
dbSNP: rs778718320
Type: single nucleotide variant
Location: chr17:73205662 (GRCh38)
Gene constraint: LOEUF 0.718 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 77.82

Full COG1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

COG1-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For COG1-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

COG1 p.Arg831= Likely benign ★ same residue
COG1 p.Arg831Trp Uncertain significance ★ ⚠ same residue
COG1 c.1070+5G>A Pathogenic ★★ same condition
COG1 p.Arg336Ter Pathogenic ★★ same condition
COG1 p.Trp476Ter Pathogenic/Likely pathogenic ★★ same condition
COG1 p.Ala143Thr Uncertain significance ★★ ⚠ same condition
COG1 p.Ala209Val Uncertain significance ★★ ⚠ same condition
COG1 p.Ala27Ser 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/cog1-p-arg831gln (accessed [today's date]).

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