Is CTSC p.Ile450Thr (c.1349T>C) pathogenic?

CTSC p.Ile450Thr (c.1349T>C) is classified Uncertain significance in CTSC (ClinVar, Single submitter, 1 submitter; last evaluated 2022-06-27). AlphaMissense: ambiguous (0.3415); Very rare (popmax 8.47e-05%, nfe); Associated with Papillon-Lefevre disease.

What condition is associated with CTSC p.Ile450Thr (c.1349T>C)?

CTSC p.Ile450Thr (c.1349T>C) is associated with Papillon-Lefevre disease, Haim-Munk syndrome, periodontitis, aggressive (ClinVar).

How common is CTSC p.Ile450Thr (c.1349T>C) in the general population?

CTSC p.Ile450Thr (c.1349T>C) 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.

What do computational predictors say about CTSC p.Ile450Thr (c.1349T>C)?

AlphaMissense predicts ambiguous (score 0.3415) — an in-silico prediction, not a clinical call.

CTSC p.Ile450Thr

c.1349T>C · rs1190457238 · VCV1486821

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3415 · ACMG-weighted

gnomAD v4.1

Rare

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

Missense predictors

2/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

Papillon-Lefevre disease

Computational evidence

Protein change
AlphaMissense	0.3415	ambiguous
REVEL	0.899	moderately pathogenic-leaning
SaProt	LLR -12.96	damaging
⇒ REVEL and SaProt both call this damaging; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 1.7, phastCons 1
Regional constraint	o/e 1.05	unconstrained · MANE · 44 kb · p 0.26 · regional, not allelic
Overall
CADD	24.5	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

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,020 alleles

Overall 6.84e-05% 1/1,461,848 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.Ile450Thr
Coding: c.1349T>C
MANE Select: NM_001814
dbSNP: rs1190457238
Type: single nucleotide variant
Location: chr11:88294049 (GRCh38)
Gene constraint: LOEUF 1.051 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 90.64 · 18 PDB

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 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
CTSC p.Arg272Pro Pathogenic/Likely pathogenic ★★ same condition
CTSC p.Arg339Cys 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-ile450thr (accessed [today's date]).

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