Is CTNS p.Tyr185Phe (c.554A>T) pathogenic?

CTNS p.Tyr185Phe (c.554A>T) is classified Uncertain significance in CTNS (ClinVar, No assertion criteria, 1 submitter; last evaluated 2020-04-21). AlphaMissense: likely benign (0.0818); Absent from gnomAD v4.1; Associated with cystinosis.

What condition is associated with CTNS p.Tyr185Phe (c.554A>T)?

CTNS p.Tyr185Phe (c.554A>T) is associated with cystinosis (ClinVar).

How common is CTNS p.Tyr185Phe (c.554A>T) in the general population?

CTNS p.Tyr185Phe (c.554A>T) is absent from gnomAD v4.1 (gnomAD).

How is Cystinosis inherited?

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

What do computational predictors say about CTNS p.Tyr185Phe (c.554A>T)?

AlphaMissense predicts likely benign (score 0.0818) — an in-silico prediction, not a clinical call.

CTNS p.Tyr185Phe

c.554A>T · rs886038378 · VCV990033

Uncertain significance No assertion criteria

Classification

Uncertain significance

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0818 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

cystinosis

Computational evidence

Protein change
AlphaMissense	0.0818	likely benign
REVEL	0.209	benign-leaning
SaProt	LLR -6.18	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.49	GERP -1.1
Regional constraint	o/e 0.96	unconstrained · MANE · 20 kb · p 0.4 · regional, not allelic
Overall
CADD	7.091	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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: CTNS
Protein: p.Tyr185Phe
Coding: c.554A>T
MANE Select: NM_004937
dbSNP: rs886038378
Type: single nucleotide variant
Location: chr17:3656579 (GRCh38)
Gene constraint: LOEUF 0.754 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 89.27 · 6 PDB
Residue 185: an α-helix; the pq-loop 1 domain

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

Disease context

cystinosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Cystinosis (Orphanet):

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

Similar variants

CTNS p.Tyr185= Likely benign ★ same residue
CTNS p.Tyr185Cys Likely benign ★ same residue
CTNS c.140+2T>C Pathogenic/Likely pathogenic ★★ same condition
CTNS c.225+3A>T Pathogenic/Likely pathogenic ★★ same condition
CTNS c.225+5G>A Likely pathogenic ★★ same condition
CTNS c.61+5G>A Pathogenic/Likely pathogenic ★★ same condition
CTNS c.681+1G>A Pathogenic ★★ same condition
CTNS c.682-1G>T 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/ctns-p-tyr185phe (accessed [today's date]).

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