Is CLN5 p.Cys165Ter (c.495C>A) pathogenic?

CLN5 p.Cys165Ter (c.495C>A) is classified Likely pathogenic in CLN5 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-31). Very rare (popmax 8.47e-05%, nfe); Associated with neuronal ceroid lipofuscinosis.

What condition is associated with CLN5 p.Cys165Ter (c.495C>A)?

CLN5 p.Cys165Ter (c.495C>A) is associated with neuronal ceroid lipofuscinosis (ClinVar).

How common is CLN5 p.Cys165Ter (c.495C>A) in the general population?

CLN5 p.Cys165Ter (c.495C>A) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

CLN5 p.Cys165Ter

c.495C>A · VCV4815513

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

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

Conditions

neuronal ceroid lipofuscinosis

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 3 of 4
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.1	GERP -1.1, phastCons 1
Overall
CADD	36.0	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) · 1/1,180,034 alleles

Overall 0.000657% 1/152,132 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: CLN5
Protein: p.Cys165Ter
Coding: c.495C>A
MANE Select: NM_006493
Type: single nucleotide variant
Location: chr13:76996057 (GRCh38)
Gene constraint: LOEUF 1.197 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 83.05 · 1 PDB
Residue 165: a disulfide bond

Full CLN5 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

neuronal ceroid lipofuscinosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CLN5 p.Cys165= Likely benign ★ same residue
CLN5 c.174-2A>G Likely pathogenic ★★ same condition
CLN5 p.Arg150Ter Pathogenic ★★ same condition
CLN5 p.Arg63His Pathogenic/Likely pathogenic ★★ ⚠ same condition
CLN5 p.Arg96Ter Pathogenic/Likely pathogenic ★★ same condition
CLN5 p.Asn143Ser Pathogenic/Likely pathogenic ★★ ⚠ same condition
CLN5 p.Cys77Tyr Likely pathogenic ★★ ⚠ same condition
CLN5 p.Gln183Ter 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/cln5-p-cys165ter (accessed [today's date]).

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