rs1338658857
Variant summary
Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1PM2PP3_StrongPP5
The NM_000271.5(NPC1):c.3281T>C(p.Ile1094Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,832 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000021 ( 0 hom. )
Consequence
NPC1
NM_000271.5 missense
NM_000271.5 missense
Scores
11
7
1
Clinical Significance
Conservation
PhyloP100: 9.32
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]
Genome browser will be placed here
ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 9 ACMG points.
PM1
?
In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_000271.5
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.984
PP5
?
Variant 18-23535665-A-G is Pathogenic according to our data. Variant chr18-23535665-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 547997.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=2, Pathogenic=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
NPC1 | NM_000271.5 | c.3281T>C | p.Ile1094Thr | missense_variant | 22/25 | ENST00000269228.10 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
NPC1 | ENST00000269228.10 | c.3281T>C | p.Ile1094Thr | missense_variant | 22/25 | 1 | NM_000271.5 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251410Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135878
GnomAD3 exomes
AF:
AC:
1
AN:
251410
Hom.:
AF XY:
AC XY:
1
AN XY:
135878
Gnomad AFR exome
AF:
Gnomad AMR exome
AF:
Gnomad ASJ exome
AF:
Gnomad EAS exome
AF:
Gnomad SAS exome
AF:
Gnomad FIN exome
AF:
Gnomad NFE exome
AF:
Gnomad OTH exome
AF:
GnomAD4 exome AF: 0.00000205 AC: 3AN: 1461832Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1AN XY: 727214
GnomAD4 exome
AF:
AC:
3
AN:
1461832
Hom.:
Cov.:
32
AF XY:
AC XY:
1
AN XY:
727214
Gnomad4 AFR exome
AF:
Gnomad4 AMR exome
AF:
Gnomad4 ASJ exome
AF:
Gnomad4 EAS exome
AF:
Gnomad4 SAS exome
AF:
Gnomad4 FIN exome
AF:
Gnomad4 NFE exome
AF:
Gnomad4 OTH exome
AF:
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
Alfa
AF:
Hom.:
Bravo
AF:
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:3Uncertain:2
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Niemann-Pick disease, type C1 Pathogenic:2Uncertain:2
Uncertain significance, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Myriad Genetics, Inc. | Nov 11, 2021 | NM_000271.4(NPC1):c.3281T>C(I1094T) is a missense variant classified as a variant of uncertain significance in the context of Niemann-Pick disease type C1. I1094T has been observed in cases with relevant disease (PMID: 27139891, 23433426, 12955717, 12408188). Functional assessments of this variant are not available in the literature. I1094T has been observed in population frequency databases (gnomAD: SAS 0.003%). In summary, there is insufficient evidence to classify NM_000271.4(NPC1):c.3281T>C(I1094T) as pathogenic or benign. Please note: this variant was assessed in the context of healthy population screening. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Mar 24, 2023 | In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt NPC1 protein function. ClinVar contains an entry for this variant (Variation ID: 547997). This missense change has been observed in individuals with Niemann-Pick disease type C (PMID: 12408188, 23433426, 27139891). This variant is present in population databases (no rsID available, gnomAD 0.003%). This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1094 of the NPC1 protein (p.Ile1094Thr). - |
Pathogenic, criteria provided, single submitter | clinical testing | Mayo Clinic Laboratories, Mayo Clinic | Aug 11, 2017 | - - |
NPC1-related disorder Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | Jan 25, 2023 | The NPC1 c.3281T>C variant is predicted to result in the amino acid substitution p.Ile1094Thr. This variant has been reported in the compound heterozygous state with another NPC1 variant in two sets of siblings affected with Niemann-Pick disease type C (Family 3 in Kaminski et al 2002. PubMed ID: 12408188; Pts 020 and 021 in Stampfer et al. 2013. PubMed ID: 23433426). This variant is reported in 0.0033% of alleles in individuals of South Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/18-21115629-A-G). This variant is interpreted as likely pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
DEOGEN2
Pathogenic
D
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D
M_CAP
Uncertain
D
MetaRNN
Pathogenic
D
MetaSVM
Pathogenic
D
MutationAssessor
Pathogenic
H
MutationTaster
Benign
D;D
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D
REVEL
Pathogenic
Sift
Uncertain
D
Sift4G
Uncertain
D
Polyphen
P
Vest4
MutPred
Loss of stability (P = 0.0044);
MVP
MPC
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at