Is PRKDC p.Arg198= (c.594C>T) pathogenic?

PRKDC p.Arg198= (c.594C>T) is classified Likely benign in PRKDC (ClinVar, Multiple submitters, 5 submitters; last evaluated 2025-05-06). Ultra-rare (popmax 0.0166%, mid); Associated with severe combined immunodeficiency due to DNA-PKcs deficiency.

What condition is associated with PRKDC p.Arg198= (c.594C>T)?

PRKDC p.Arg198= (c.594C>T) is associated with severe combined immunodeficiency due to DNA-PKcs deficiency (ClinVar).

How common is PRKDC p.Arg198= (c.594C>T) in the general population?

PRKDC p.Arg198= (c.594C>T) is ultra-rare (popmax 0.0166%, mid) (gnomAD).

PRKDC p.Arg198=

Q: How is Severe combined immunodeficiency due to DNA-PKcs deficiency inherited?

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

c.594C>T · rs550250358 · VCV513590

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0166%, mid)

Conditions

severe combined immunodeficiency due to DNA-PKcs deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -0.46	GERP -3.3, phastCons 0.027
Overall
CADD	12.24	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0166% Middle Eastern · 1/6,024 alleles

Filtering AF 0.00802% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00625%

Overall 0.00445% 70/1,571,600 alleles · ultra-rare exomes 61/1,419,346 · genomes 9/152,254 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0166%	6,024
South Asian	0.014%	7,167
East Asian	0.00689%	14,509
African / African-American	0.00538%	18,580
European (non-Finnish)	0.00406%	24,602
Remaining individualsnot grpmax-eligible	0.00328%	30,491
Admixed American	0.00188%	53,206

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: PRKDC
Protein: p.Arg198=
Coding: c.594C>T
MANE Select: NM_006904
dbSNP: rs550250358
Type: single nucleotide variant
Location: chr8:47953834 (GRCh38)
Gene constraint: LOEUF 0.183 · pLI 1.00 (gnomAD)
Residue 198: an α-helix

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

Disease context

severe combined immunodeficiency due to DNA-PKcs deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Severe combined immunodeficiency due to DNA-PKcs deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

PRKDC p.Arg198Cys Uncertain significance ★★ same residue
PRKDC p.Arg198His Uncertain significance ★★ ⚠ same residue
PRKDC p.Arg198fs Uncertain significance ★ same residue
PRKDC c.2259+6C>T Uncertain significance ★★ same condition
PRKDC c.3464+4G>A Uncertain significance ★★ same condition
PRKDC c.5235+6T>C Uncertain significance ★★ same condition
PRKDC c.5919+5G>A Uncertain significance ★★ same condition
PRKDC p.Ala1008Val 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/prkdc-p-arg198 (accessed [today's date]).

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