Is CTSD p.Lys341= (c.1023G>A) pathogenic?

CTSD p.Lys341= (c.1023G>A) is classified Likely benign in CTSD (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-01-28). Ultra-rare (popmax 0.0165%, mid); Associated with Inborn genetic diseases.

What condition is associated with CTSD p.Lys341= (c.1023G>A)?

CTSD p.Lys341= (c.1023G>A) is associated with Inborn genetic diseases, neuronal ceroid lipofuscinosis (ClinVar).

How common is CTSD p.Lys341= (c.1023G>A) in the general population?

CTSD p.Lys341= (c.1023G>A) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

CTSD p.Lys341=

c.1023G>A · rs111849172 · VCV527773

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

Inborn genetic diseases

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.012	strongly benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.3
Overall
CADD	5.171	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,062 alleles

Filtering AF 0.00437% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00312%

Overall 0.00123% 18/1,461,400 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,062
African / African-American	0.00933%	10,716
South Asian	0.00879%	11,383
Remaining individualsnot grpmax-eligible	0.0032%	31,241

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: CTSD
Protein: p.Lys341=
Coding: c.1023G>A
MANE Select: NM_001909
dbSNP: rs111849172
Type: single nucleotide variant
Location: chr11:1753851 (GRCh38)
Gene constraint: LOEUF 0.886 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 85.69 · 9 PDB
Residue 341: a disulfide bond; the peptidase a1 domain; a β-strand

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: neuronal ceroid lipofuscinosis

Similar variants

CTSD c.228+1G>A Likely pathogenic ★★ same condition
CTSD p.Glu82Ter Pathogenic/Likely pathogenic ★★ same condition
CTSD c.828-3C>A Uncertain significance ★★ same condition
CTSD p.Ala10Ser Uncertain significance ★★ ⚠ same condition
CTSD p.Ala116Thr Uncertain significance ★★ ⚠ same condition
CTSD p.Ala18Pro Uncertain significance ★★ ⚠ same condition
CTSD p.Ala18Thr Uncertain significance ★★ ⚠ same condition
CTSD p.Ala239Val 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/ctsd-p-lys341 (accessed [today's date]).

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