Is COG5 p.Arg296His (c.887G>A) pathogenic?

COG5 p.Arg296His (c.887G>A) is classified Uncertain significance in COG5 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-31). AlphaMissense: ambiguous (0.5437); Very rare (popmax 0.00439%, sas); Associated with COG5-congenital disorder of glycosylation.

What condition is associated with COG5 p.Arg296His (c.887G>A)?

COG5 p.Arg296His (c.887G>A) is associated with COG5-congenital disorder of glycosylation (ClinVar).

How common is COG5 p.Arg296His (c.887G>A) in the general population?

COG5 p.Arg296His (c.887G>A) is very rare (popmax 0.00439%, sas) (gnomAD).

How is COG5-CDG inherited?

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

What do computational predictors say about COG5 p.Arg296His (c.887G>A)?

AlphaMissense predicts ambiguous (score 0.5437) — an in-silico prediction, not a clinical call.

COG5 p.Arg296His

c.887G>A · rs576854159 · VCV1037748

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.5437 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00439%, sas)

Conditions

COG5-congenital disorder of glycosylation

Computational evidence

Protein change
AlphaMissense	0.5437	ambiguous
REVEL	0.467	indeterminate
SaProt	LLR -7.87	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.6	GERP 2.1, phastCons 1
Regional constraint	o/e 1.09	unconstrained · MANE · 360 kb · p 0.0042 · regional, not allelic
Overall
CADD	31.0	PHRED · no single calibrated threshold — expert panels disagree

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM R327H vs ClinVar R296H) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00439% South Asian · 4/91,088 alleles

Filtering AF 0.00143% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000891%

Overall 0.00062% 10/1,613,814 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00439%	22,772
Admixed American	0.00333%	30,001
Remaining individualsnot grpmax-eligible	0.0016%	62,472
African / African-American	0.00134%	74,862
European (non-Finnish)	0.00017%	589,943

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: COG5
Protein: p.Arg296His
Coding: c.887G>A
MANE Select: NM_006348
dbSNP: rs576854159
Type: single nucleotide variant
Location: chr7:107362369 (GRCh38)
Gene constraint: LOEUF 1.026 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.37

Full COG5 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

COG5-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For COG5-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

COG5 c.1475+1G>A Likely pathogenic ★★ same condition
COG5 c.2295+2T>C Pathogenic/Likely pathogenic ★★ same condition
COG5 p.Arg205Ter Pathogenic ★★ same condition
COG5 p.Arg283Ter Pathogenic ★★ same condition
COG5 p.Arg461Ter Pathogenic/Likely pathogenic ★★ same condition
COG5 p.Arg690Ter Pathogenic/Likely pathogenic ★★ same condition
COG5 p.Arg708Ter Pathogenic/Likely pathogenic ★★ same condition
COG5 p.Met1Arg Pathogenic/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/cog5-p-arg296his (accessed [today's date]).

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