rs80358268

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_006432.5(NPC2):c.190+5G>A variant causes a splice region, intron change. The variant allele was found at a frequency of 0.0000196 in 1,583,322 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign 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: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000020 ( 0 hom. )

Consequence

NPC2
NM_006432.5 splice_region, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7O:1

Conservation

PhyloP100: 6.90

Publications

7 publications found

Variant links:

Genes affected

NPC2 (HGNC:14537): (NPC intracellular cholesterol transporter 2) This gene encodes a protein containing a lipid recognition domain. The encoded protein may function in regulating the transport of cholesterol through the late endosomal/lysosomal system. Mutations in this gene have been associated with Niemann-Pick disease, type C2 and frontal lobe atrophy. [provided by RefSeq, Jul 2008]

NPC2 Gene-Disease associations (from GenCC):

Niemann-Pick disease, type C2
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Myriad Women’s Health, G2P, Genomics England PanelApp, Laboratory for Molecular Medicine, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
Niemann-Pick disease type C, adult neurologic onset
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Niemann-Pick disease type C, juvenile neurologic onset
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Niemann-Pick disease type C, late infantile neurologic onset
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Niemann-Pick disease type C, severe early infantile neurologic onset
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Niemann-Pick disease type C, severe perinatal form
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

NPC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

PP5

Variant 14-74486324-C-T is Pathogenic according to our data. Variant chr14-74486324-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 8479.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein
NPC2	NM_006432.5 link	c.190+5G>A	splice_region_variant, intron_variant	Intron 2 of 4	ENST00000555619.6	NP_006423.1
NPC2	NM_001363688.1 link	c.190+5G>A	splice_region_variant, intron_variant	Intron 2 of 3		NP_001350617.1
NPC2	NM_001375440.1 link	c.190+5G>A	splice_region_variant, intron_variant	Intron 2 of 3		NP_001362369.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NPC2	ENST00000555619.6 link	c.190+5G>A		splice_region_variant, intron_variant	Intron 2 of 4	1	NM_006432.5	ENSP00000451112.2

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000434

AC:

AN:

207150

AF XY:

0.0000182

show subpopulations

Gnomad AFR exome

AF:

0.0000755

Gnomad AMR exome

AF:

0.000102

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000109

Gnomad NFE exome

AF:

0.0000111

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000196

AC:

AN:

1431022

Hom.:

Cov.:

AF XY:

0.0000212

AC XY:

AN XY:

708608

show subpopulations

African (AFR)

AF:

0.0000301

AC:

AN:

33200

American (AMR)

AF:

0.0000752

AC:

AN:

39912

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25440

East Asian (EAS)

AF:

0.00

AC:

AN:

38980

South Asian (SAS)

AF:

0.0000611

AC:

AN:

81836

European-Finnish (FIN)

AF:

0.0000387

AC:

AN:

51704

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5734

European-Non Finnish (NFE)

AF:

0.0000128

AC:

AN:

1094982

Other (OTH)

AF:

0.0000506

AC:

AN:

59234

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152300

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74486

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41562

American (AMR)

AF:

0.00

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000545

Hom.:

Bravo

AF:

0.0000227

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Niemann-Pick disease, type C2

Pathogenic:7Other:1

Jan 19, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change falls in intron 2 of the NPC2 gene. It does not directly change the encoded amino acid sequence of the NPC2 protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or altered protein product. This variant is present in population databases (rs80358268, gnomAD 0.01%). This variant has been observed in individuals with Niemann-Pick type C disease (PMID: 11567215, 28105569). This variant is also known as IVS2+5G>A. ClinVar contains an entry for this variant (Variation ID: 8479). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in abnormal RNA spliceforms, and produces a non-functional protein and/or introduces a premature termination codon (PMID: 11567215). 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.

Oct 08, 2020

Natera, Inc.

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Sep 01, 2024

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 01, 2001

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

Jun 05, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

GeneReviews

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

Feb 16, 2021

Revvity Omics, Revvity

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 01, 2017

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant has been previously reported as disease-causing and was found once in our laboratory homozygous in a 14-year-old male with intellectual disability, epilepsy, similarly affected sibling

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.090

CADD

Pathogenic

(source)

DANN

Uncertain

0.98

PhyloP100

6.9

Mutation Taster

=1/99

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.93

SpliceAI score (max)

0.89

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.89

Position offset: 5

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over