Is CTSC p.Gln286Ter (c.856C>T) pathogenic?

CTSC p.Gln286Ter (c.856C>T) is classified Pathogenic in CTSC (ClinVar, Single submitter, 2 submitters; last evaluated 2023-07-19). Very rare (popmax 8.47e-05%, nfe); Associated with Papillon-Lefevre disease.

What condition is associated with CTSC p.Gln286Ter (c.856C>T)?

CTSC p.Gln286Ter (c.856C>T) is associated with Papillon-Lefevre disease, Haim-Munk syndrome, periodontitis, aggressive (ClinVar).

How common is CTSC p.Gln286Ter (c.856C>T) in the general population?

CTSC p.Gln286Ter (c.856C>T) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

How is Papillon-Lefèvre syndrome inherited?

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

CTSC p.Gln286Ter

c.856C>T · rs104894209 · VCV7292

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Conditions

Papillon-Lefevre disease

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	escapes	premature termination codon within the last 50 nt of the penultimate exon (6 of 7, 33 nt from its 3' end) — the truncated protein is likely expressed. PVS1 input, not an applied code
Splicing
SpliceAI	Δ0.20	donor loss, 33 bp away · masked 0 · deltas
Pangolin	Δ0.51	loss · gain 0.00 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 12	GERP 1.7, phastCons 1
Overall
CADD	44.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,179,942 alleles

Overall 0.000657% 1/152,154 alleles · very rare

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: CTSC
Protein: p.Gln286Ter
Coding: c.856C>T
MANE Select: NM_001814
dbSNP: rs104894209
Type: single nucleotide variant
Location: chr11:88296166 (GRCh38)
Gene constraint: LOEUF 1.051 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 90.64 · 18 PDB
Residue 286: a disulfide bond; a UniProt-annotated variant site (in hms and pls); an α-helix

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

Disease context

Papillon-Lefevre disease — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Haim-Munk syndrome periodontitis, aggressive

For Papillon-Lefèvre syndrome (Orphanet):

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

Similar variants

CTSC p.Gln286Arg Conflicting classifications of pathogenicity ★ ⚠ same residue
CTSC p.Gln286fs Pathogenic ★ same residue
CTSC c.319-1G>A Pathogenic ★★ same condition
CTSC c.757+1G>T Likely pathogenic ★★ same condition
CTSC c.-55C>A Pathogenic ★★ same condition
CTSC p.Arg210Ter Pathogenic ★★ same condition
CTSC p.Arg250Ter Pathogenic/Likely pathogenic ★★ same condition
CTSC p.Arg272His 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/ctsc-p-gln286ter (accessed [today's date]).

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