Is ADA p.Arg282Pro (c.845G>C) pathogenic?

ADA p.Arg282Pro (c.845G>C) is classified Likely pathogenic in ADA (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-01). AlphaMissense: likely pathogenic (0.6605); Absent from gnomAD v4.1; Associated with severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-negative, due to adenosine deaminase deficiency.

How common is ADA p.Arg282Pro (c.845G>C) in the general population?

ADA p.Arg282Pro (c.845G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ADA p.Arg282Pro (c.845G>C)?

AlphaMissense predicts likely pathogenic (score 0.6605) — an in-silico prediction, not a clinical call.

ADA p.Arg282Pro

Q: What condition is associated with ADA p.Arg282Pro (c.845G>C)?

ADA p.Arg282Pro (c.845G>C) is associated with severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-negative, due to adenosine deaminase deficiency (ClinVar).

Q: How is Severe combined immunodeficiency due to adenosine deaminase deficiency inherited?

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

c.845G>C · VCV4533326

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6605 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-negative, due to adenosine deaminase deficiency

Computational evidence

Protein change
AlphaMissense	0.6605	likely pathogenic ✓ concordant with ClinVar
REVEL	0.83	moderately pathogenic-leaning
SaProt	LLR -11.03	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	Δ0.51	donor loss · deltas
Pangolin	Δ0.63	loss · gain 0.02 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 5.8	GERP 1.4, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 32 kb · p 0.21 · regional, not allelic
Overall
CADD	35.0	PHRED · no single calibrated threshold — expert panels disagree

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

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: ADA
Protein: p.Arg282Pro
Coding: c.845G>C
MANE Select: NM_000022
Type: single nucleotide variant
Location: chr20:44622588 (GRCh38)
Gene constraint: LOEUF 1.184 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.81 · 2 PDB
Residue 282: an α-helix

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

Disease context

severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-negative, due to adenosine deaminase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Severe combined immunodeficiency due to adenosine deaminase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

ADA p.Arg282Gln Pathogenic ★★★ ⚠ same residue
ADA p.Arg282Leu Likely pathogenic ★★ ⚠ same residue
ADA p.Arg282Trp Conflicting classifications of pathogenicity ★ ⚠ same residue
ADA p.Arg282Gly Uncertain significance ★ ⚠ same residue
ADA c.1078+2T>A Likely pathogenic ★★★ same condition
ADA c.219-2A>G Likely pathogenic ★★★ same condition
ADA c.363-2A>G Likely pathogenic ★★★ same condition
ADA c.606+1G>T 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/ada-p-arg282pro (accessed [today's date]).

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