rs151220873

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_006432.5(NPC2):c.88G>A(p.Val30Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00139 in 1,588,322 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0014 ( 15 hom. )

Consequence

NPC2
NM_006432.5 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts P:1B:15

Conservation

PhyloP100: -1.97

Publications

19 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: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0055167973).

BP6

Variant 14-74486431-C-T is Benign according to our data. Variant chr14-74486431-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 183281.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00133 (203/152276) while in subpopulation SAS AF = 0.00497 (24/4826). AF 95% confidence interval is 0.00343. There are 0 homozygotes in GnomAd4. There are 100 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 15 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
NPC2	NM_006432.5 link	c.88G>A	p.Val30Met	missense_variant	Exon 2 of 5	ENST00000555619.6	NP_006423.1
NPC2	NM_001363688.1 link	c.88G>A	p.Val30Met	missense_variant	Exon 2 of 4		NP_001350617.1
NPC2	NM_001375440.1 link	c.88G>A	p.Val30Met	missense_variant	Exon 2 of 4		NP_001362369.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NPC2	ENST00000555619.6 link	c.88G>A	p.Val30Met	missense_variant	Exon 2 of 5	1	NM_006432.5	ENSP00000451112.2		P61916-1

Frequencies

GnomAD3 genomes

AF:

0.00135

AC:

205

AN:

152158

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000265

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000851

Gnomad ASJ

AF:

0.0193

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00538

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.0127

Gnomad NFE

AF:

0.00118

Gnomad OTH

AF:

0.00144

GnomAD2 exomes

AF:

0.00213

AC:

442

AN:

207464

AF XY:

0.00247

show subpopulations

Gnomad AFR exome

AF:

0.0000758

Gnomad AMR exome

AF:

0.000918

Gnomad ASJ exome

AF:

0.0194

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00106

Gnomad OTH exome

AF:

0.00454

GnomAD4 exome

AF:

0.00139

AC:

1999

AN:

1436046

Hom.:

Cov.:

AF XY:

0.00158

AC XY:

1126

AN XY:

711534

show subpopulations

African (AFR)

AF:

0.000481

AC:

AN:

33266

American (AMR)

AF:

0.000984

AC:

AN:

40658

Ashkenazi Jewish (ASJ)

AF:

0.0189

AC:

482

AN:

25500

East Asian (EAS)

AF:

0.00

AC:

AN:

39216

South Asian (SAS)

AF:

0.00495

AC:

407

AN:

82274

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51960

Middle Eastern (MID)

AF:

0.0124

AC:

AN:

5738

European-Non Finnish (NFE)

AF:

0.000737

AC:

809

AN:

1097992

Other (OTH)

AF:

0.00293

AC:

174

AN:

59442

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.455

Heterozygous variant carriers

111

222

333

444

555

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

114

152

190

<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:

0.00133

AC:

203

AN:

152276

Hom.:

Cov.:

AF XY:

0.00134

AC XY:

100

AN XY:

74450

show subpopulations

African (AFR)

AF:

0.000265

AC:

AN:

41554

American (AMR)

AF:

0.000850

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.0193

AC:

AN:

3472

East Asian (EAS)

AF:

0.000193

AC:

AN:

5190

South Asian (SAS)

AF:

0.00497

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.0136

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00118

AC:

AN:

68026

Other (OTH)

AF:

0.00142

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00188

Hom.:

Bravo

AF:

0.00134

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00291

AC:

ExAC

AF:

0.00156

AC:

189

Asia WGS

AF:

0.00202

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Pathogenic:1Benign:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:8

May 28, 2019

Mendelics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 19, 2017

Mayo Clinic Laboratories, Mayo Clinic

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

NPC2: BP4, BS1, BS2 -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Oct 06, 2020

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 32858489, 15465422, 30556376, 15937921, 12955717, 25764212, 24386122, 21228398, 27792009, 25558065, 27884173, 25099932) -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Niemann-Pick disease, type C2

Benign:5

May 18, 2021

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 18, 2020

Natera, Inc.

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Nov 21, 2022

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:research

- -

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 17, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Benign:2

Jul 06, 2022

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: NPC2 c.88G>A (p.Val30Met) results in a conservative amino acid change located in the MD-2-related lipid-recognition domain (IPR003172) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0021 in 207464 control chromosomes, predominantly at a frequency of 0.0046 within the South Asian subpopulation in the gnomAD database, including 3 homozygotes. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 7-fold of the estimated maximal expected allele frequency for a pathogenic variant in NPC2 causing Niemann-Pick Disease Type C phenotype (0.00068), strongly suggesting that the variant is a benign polymorphism found primarily in populations of South Asian origin. To our knowledge, no penetrant association of c.88G>A with Niemann-Pick Disease Type C has been reported in the literature. A functional study examining the expression and localization of NPC2 missense variants in human fibroblasts found no biological abnormalities in cells expressing this variant, suggesting it does not strongly impact protein function (Chikh_2005). Seven assessments for this variant have been submitted to ClinVar after 2014 without evidence for independent evaluation and all classified the variant as benign (n=4) or likely benign (n=3). Based on the evidence outlined above, the variant was classified as benign. -

Aug 25, 2015

Eurofins Ntd Llc (ga)

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Seizure;C0557874:Global developmental delay;C4551563:Microcephaly;C4551584:Brain atrophy

Pathogenic:1

Dec 01, 2014

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.18

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.16

T;.;T;.;.;.;T

Eigen

Benign

-0.98

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.028

LIST_S2

Benign

0.77

T;T;T;T;T;T;T

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.0055

T;T;T;T;T;T;T

MetaSVM

Benign

-0.53

MutationAssessor

Benign

1.3

.;L;L;.;.;.;.

PhyloP100

-2.0

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.34

N;N;N;N;N;N;N

REVEL

Uncertain

0.49

Sift

Benign

0.11

T;T;T;T;T;T;T

Sift4G

Benign

0.11

T;T;T;T;.;T;.

Polyphen

0.92

.;.;P;.;.;.;.

Vest4

0.69

MVP

0.42

MPC

1.1

ClinPred

0.060

GERP RS

-7.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.15

gMVP

0.41

Mutation Taster

=98/2

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over