rs1555631571
Variant names:
Your query was ambiguous. Multiple possible variants found:
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1PM2PP5_Moderate
The NM_000271.5(NPC1):c.3754+1G>T variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,482 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★).
Frequency
Genomes: not found (cov: 33)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
NPC1
NM_000271.5 splice_donor, intron
NM_000271.5 splice_donor, intron
Scores
5
1
1
Splicing: ADA: 1.000
2
Clinical Significance
Conservation
PhyloP100: 7.90
Genes affected
NPC1 (HGNC:7897): (NPC intracellular cholesterol transporter 1) This gene encodes a large protein that resides in the limiting membrane of endosomes and lysosomes and mediates intracellular cholesterol trafficking via binding of cholesterol to its N-terminal domain. It is predicted to have a cytoplasmic C-terminus, 13 transmembrane domains, and 3 large loops in the lumen of the endosome - the last loop being at the N-terminus. This protein transports low-density lipoproteins to late endosomal/lysosomal compartments where they are hydrolized and released as free cholesterol. Defects in this gene cause Niemann-Pick type C disease, a rare autosomal recessive neurodegenerative disorder characterized by over accumulation of cholesterol and glycosphingolipids in late endosomal/lysosomal compartments.[provided by RefSeq, Aug 2009]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 18-23533354-C-A is Pathogenic according to our data. Variant chr18-23533354-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 552085.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| NPC1 | NM_000271.5 | c.3754+1G>T | splice_donor_variant, intron_variant | Intron 24 of 24 | ENST00000269228.10 | NP_000262.2 |
Ensembl
Frequencies
GnomAD3 genomes
GnomAD3 genomes
Cov.:
33
GnomAD4 exome AF: 6.84e-7 AC: 1AN: 1461482Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1AN XY: 727074
GnomAD4 exome
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31
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1
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727074
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GnomAD4 genome
GnomAD4 genome
Cov.:
33
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Niemann-Pick disease, type C1 Pathogenic:1
May 26, 2017
Counsyl
Significance: Likely pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing
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Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DL_spliceai
Position offset: 1
Find out detailed SpliceAI scores and Pangolin per-transcript scores at