Is COASY p.Arg337Cys (c.1009C>T) pathogenic?

COASY p.Arg337Cys (c.1009C>T) is classified Uncertain significance in COASY (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-03-27). AlphaMissense: likely pathogenic (0.6725); Very rare (popmax 0.00669%, eas); Associated with neurodegeneration with brain iron accumulation 6.

What condition is associated with COASY p.Arg337Cys (c.1009C>T)?

COASY p.Arg337Cys (c.1009C>T) is associated with neurodegeneration with brain iron accumulation 6 (ClinVar).

How common is COASY p.Arg337Cys (c.1009C>T) in the general population?

COASY p.Arg337Cys (c.1009C>T) is very rare (popmax 0.00669%, eas) (gnomAD).

How is COASY protein-associated neurodegeneration inherited?

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

What do computational predictors say about COASY p.Arg337Cys (c.1009C>T)?

AlphaMissense predicts likely pathogenic (score 0.6725) — an in-silico prediction, not a clinical call.

COASY p.Arg337Cys

c.1009C>T · rs774485077 · VCV2010444

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

0.6725 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00669%, eas)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

neurodegeneration with brain iron accumulation 6

Computational evidence

Protein change
AlphaMissense	0.6725	likely pathogenic
REVEL	0.81	moderately pathogenic-leaning
SaProt	LLR -14.33	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.9	GERP 2.5, phastCons 1
Regional constraint	o/e 0.99	unconstrained · MANE · 3,342 bp · p 0.88 · regional, not allelic
Overall
CADD	27.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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 0.00669% East Asian · 3/44,856 alleles

Filtering AF 0.00177% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000892%

Overall 0.00093% 15/1,612,846 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00669%	14,952
Admixed American	0.00502%	19,922
Remaining individualsnot grpmax-eligible	0.0016%	62,420
Finnishnot grpmax-eligible	0.00156%	63,958
African / African-American	0.00134%	74,854
European (non-Finnish)	0.000509%	196,589

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: COASY
Protein: p.Arg337Cys
Coding: c.1009C>T
MANE Select: NM_025233
dbSNP: rs774485077
Type: single nucleotide variant
Location: chr17:42564539 (GRCh38)
Gene constraint: LOEUF 0.791 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.51
Residue 337: a UniProt-annotated variant site (in nbia6; reduced protein abundance); the 'phosphopantetheine adenylyltransferase domain' region

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

Disease context

neurodegeneration with brain iron accumulation 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For COASY protein-associated neurodegeneration (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

COASY c.1486-3C>G Pathogenic/Likely pathogenic ★★ same condition
COASY p.Ala214Val Likely pathogenic ★★ ⚠ same condition
COASY p.Arg377Ter Pathogenic/Likely pathogenic ★★ same condition
COASY p.Arg499Cys Pathogenic ★★ same condition
COASY p.Gln523Ter Pathogenic ★★ same condition
COASY p.Ala206Ser Uncertain significance ★★ ⚠ same condition
COASY p.Ala311Val Uncertain significance ★★ ⚠ same condition
COASY p.Ala395Thr 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/coasy-p-arg337cys (accessed [today's date]).

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