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NM_000271.5(NPC1):c.463G>T (p.Ala155Ser) AND Niemann-Pick disease, type C1

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Jul 30, 2022
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
Somatic classification
of clinical impact:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of oncogenicity:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Record status:
current
Accession:
RCV002857398.3

Allele description [Variation Report for NM_000271.5(NPC1):c.463G>T (p.Ala155Ser)]

NM_000271.5(NPC1):c.463G>T (p.Ala155Ser)

Gene:
NPC1:NPC intracellular cholesterol transporter 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
18q11.2
Genomic location:
Preferred name:
NM_000271.5(NPC1):c.463G>T (p.Ala155Ser)
HGVS:
  • NC_000018.10:g.23568823C>A
  • NG_012795.1:g.22795G>T
  • NG_012795.2:g.22683G>T
  • NM_000271.5:c.463G>TMANE SELECT
  • NP_000262.1:p.Ala155Ser
  • NP_000262.2:p.Ala155Ser
  • NC_000018.9:g.21148787C>A
  • NM_000271.3:c.463G>T
Protein change:
A155S
Molecular consequence:
  • NM_000271.5:c.463G>T - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Niemann-Pick disease, type C1
Synonyms:
NIEMANN-PICK DISEASE WITHOUT SPHINGOMYELINASE DEFICIENCY; Niemann-Pick disease with cholesterol esterification block; Niemann-Pick disease, chronic neuronopathic form; See all synonyms [MedGen]
Identifiers:
MONDO: MONDO:0009757; MedGen: C3179455; Orphanet: 646; OMIM: 257220

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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV003226155Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Jul 30, 2022) 		germlineclinical testing

PubMed (3)
[See all records that cite these PMIDs]

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Citations

PubMed

Aberrant 5' splice sites in human disease genes: mutation pattern, nucleotide structure and comparison of computational tools that predict their utilization.

Buratti E, Chivers M, Královicová J, Romano M, Baralle M, Krainer AR, Vorechovsky I.

Nucleic Acids Res. 2007;35(13):4250-63. Epub 2007 Jun 18.

PubMed [citation]
PMID:
17576681
PMCID:
PMC1934990

Statistical features of human exons and their flanking regions.

Zhang MQ.

Hum Mol Genet. 1998 May;7(5):919-32.

PubMed [citation]
PMID:
9536098
See all PubMed Citations (3)

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV003226155.2

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (3)

Description

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. This variant has not been reported in the literature in individuals affected with NPC1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 155 of the NPC1 protein (p.Ala155Ser). This variant also falls at the last nucleotide of exon 4, which is part of the consensus splice site for this exon.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Sep 29, 2024