Is DDC p.Arg285= (c.855G>A) pathogenic?

DDC p.Arg285= (c.855G>A) is classified Likely benign in DDC (ClinVar, Single submitter, 1 submitter; last evaluated 2021-10-29). Absent from gnomAD v4.1; Associated with aromatic L-amino acid decarboxylase deficiency.

What condition is associated with DDC p.Arg285= (c.855G>A)?

DDC p.Arg285= (c.855G>A) is associated with aromatic L-amino acid decarboxylase deficiency (ClinVar).

How common is DDC p.Arg285= (c.855G>A) in the general population?

DDC p.Arg285= (c.855G>A) is absent from gnomAD v4.1 (gnomAD).

How is Aromatic L-amino acid decarboxylase deficiency inherited?

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

DDC p.Arg285=

c.855G>A · rs2043191670 · VCV1571204

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

aromatic L-amino acid decarboxylase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.015	strongly benign-leaning
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 0.76	GERP -0.81, phastCons 0.99
Overall
CADD	8.662	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: DDC
Protein: p.Arg285=
Coding: c.855G>A
MANE Select: NM_001082971
dbSNP: rs2043191670
Type: single nucleotide variant
Location: chr7:50499169 (GRCh38)
Gene constraint: LOEUF 0.922 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.88 · 8 PDB
Residue 285: an α-helix

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

Disease context

aromatic L-amino acid decarboxylase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Aromatic L-amino acid decarboxylase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

DDC p.Arg285Gln Uncertain significance ★★ ⚠ same residue
DDC p.Arg285Trp Conflicting classifications of pathogenicity ★ same residue
DDC c.1041+1G>A Pathogenic/Likely pathogenic ★★ same condition
DDC c.201+1G>C Likely pathogenic ★★ same condition
DDC c.201+5G>C Pathogenic/Likely pathogenic ★★ same condition
DDC c.714+4A>T Pathogenic ★★ same condition
DDC p.Ala275Thr Pathogenic/Likely pathogenic ★★ same condition
DDC p.Ala91Val 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/ddc-p-arg285 (accessed [today's date]).

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