Is PRKCD p.Thr85= (c.255C>T) pathogenic?

PRKCD p.Thr85= (c.255C>T) is classified Likely benign in PRKCD (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-29). Very rare (popmax 0.00213%, nfe); Associated with autoimmune lymphoproliferative syndrome, type III caused by mutation in PRKCD.

How common is PRKCD p.Thr85= (c.255C>T) in the general population?

PRKCD p.Thr85= (c.255C>T) is very rare (popmax 0.00213%, nfe) (gnomAD).

PRKCD p.Thr85=

Q: What condition is associated with PRKCD p.Thr85= (c.255C>T)?

PRKCD p.Thr85= (c.255C>T) is associated with autoimmune lymphoproliferative syndrome, type III caused by mutation in PRKCD (ClinVar).

Q: How is EBV-induced lymphoproliferative disease due to PRKCD deficiency inherited?

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

c.255C>T · rs782661116 · VCV1085953

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00213%, nfe)

Conditions

autoimmune lymphoproliferative syndrome, type III caused by mutation in PRKCD

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.21	donor gain, 6 bp away · raw score · deltas
Constraint at this position
Conservation	phyloP -14	GERP -4.9
Overall
CADD	6.863	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00213% European (non-Finnish) · 25/1,174,928 alleles

Filtering AF 0.00146% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00123%

Overall 0.00206% 33/1,605,012 alleles · very rare exomes 30/1,453,006 · genomes 3/152,006 · joint denominator

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.00966%	10,351
European (non-Finnish)grpmax	0.00213%	46,997
African / African-American	0.00134%	74,656
South Asian	0.00111%	89,908

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: PRKCD
Protein: p.Thr85=
Coding: c.255C>T
MANE Select: NM_006254
dbSNP: rs782661116
Type: single nucleotide variant
Location: chr3:53179716 (GRCh38)
Gene constraint: LOEUF 0.344 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 81.29 · 2 PDB
Residue 85: the c2 domain; a β-strand

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

Disease context

autoimmune lymphoproliferative syndrome, type III caused by mutation in PRKCD — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For EBV-induced lymphoproliferative disease due to PRKCD deficiency (Orphanet):

Inheritance: Autosomal recessive

Similar variants

PRKCD c.787+4C>T Uncertain significance ★★ same condition
PRKCD p.Ala195Val Uncertain significance ★★ ⚠ same condition
PRKCD p.Ala212Val Uncertain significance ★★ ⚠ same condition
PRKCD p.Ala404Gly Uncertain significance ★★ ⚠ same condition
PRKCD p.Arg273Trp Uncertain significance ★★ ⚠ same condition
PRKCD p.Arg40His Uncertain significance ★★ same condition
PRKCD p.Arg444Cys Uncertain significance ★★ same condition
PRKCD p.Arg569His 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/prkcd-p-thr85 (accessed [today's date]).

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