Is NPC1 p.Ser602Pro (c.1804T>C) pathogenic?

NPC1 p.Ser602Pro (c.1804T>C) is classified Uncertain significance in NPC1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-08-17). AlphaMissense: likely pathogenic (0.812); Absent from gnomAD v4.1; Associated with Niemann-Pick disease, type C1.

What condition is associated with NPC1 p.Ser602Pro (c.1804T>C)?

NPC1 p.Ser602Pro (c.1804T>C) is associated with Niemann-Pick disease, type C1 (ClinVar).

How common is NPC1 p.Ser602Pro (c.1804T>C) in the general population?

NPC1 p.Ser602Pro (c.1804T>C) is absent from gnomAD v4.1 (gnomAD).

How is Niemann-Pick disease type C inherited?

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

What do computational predictors say about NPC1 p.Ser602Pro (c.1804T>C)?

AlphaMissense predicts likely pathogenic (score 0.812) — an in-silico prediction, not a clinical call.

NPC1 p.Ser602Pro

c.1804T>C · rs2511240489 · VCV2851005

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.812 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Niemann-Pick disease, type C1

Computational evidence

Protein change
AlphaMissense	0.812	likely pathogenic
REVEL	0.784	moderately pathogenic-leaning
SaProt	LLR -9.73	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 8	GERP 0.7, phastCons 1
Regional constraint	o/e 0.93	unconstrained · MANE · 54 kb · p 0.0029 · regional, not allelic
Overall
CADD	22.1	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

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: NPC1
Protein: p.Ser602Pro
Coding: c.1804T>C
MANE Select: NM_000271
dbSNP: rs2511240489
Type: single nucleotide variant
Location: chr18:23545103 (GRCh38)
Gene constraint: LOEUF 0.676 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 85.35 · 20 PDB
Residue 602: a β-strand

Full NPC1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Niemann-Pick disease, type C1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Niemann-Pick disease type C (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

NPC1 c.1554-1009G>A Pathogenic ★★ same condition
NPC1 c.1757+1G>A Likely pathogenic ★★ same condition
NPC1 c.1947+5G>C Pathogenic/Likely pathogenic ★★ same condition
NPC1 c.2130+1G>A Pathogenic ★★ same condition
NPC1 c.2245+1G>A Pathogenic/Likely pathogenic ★★ same condition
NPC1 c.2246-2A>G Pathogenic/Likely pathogenic ★★ same condition
NPC1 c.2515-2A>G Pathogenic/Likely pathogenic ★★ same condition
NPC1 c.2604+1G>A 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/npc1-p-ser602pro (accessed [today's date]).

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