chr14-74480292-T-G

Position:

chr14-74480292-T-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_006432.5(NPC2):c.442-4A>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0033 in 1,612,074 control chromosomes in the GnomAD database, including 119 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0077 ( 19 hom., cov: 32)

Exomes 𝑓: 0.0028 ( 100 hom. )

Consequence

NPC2
NM_006432.5 splice_region, intron

Scores

Splicing: ADA: 0.00008026

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:9

Conservation

PhyloP100: -1.17

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BP6

Variant 14-74480292-T-G is Benign according to our data. Variant chr14-74480292-T-G is described in ClinVar as [Likely_benign]. Clinvar id is 197788.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-74480292-T-G is described in Lovd as [Likely_benign]. Variant chr14-74480292-T-G is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.00767 (1168/152286) while in subpopulation SAS AF= 0.0315 (152/4822). AF 95% confidence interval is 0.0274. There are 19 homozygotes in gnomad4. There are 587 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 19 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	#exon/exons	MANE	Protein
NPC2	NM_006432.5 link	c.442-4A>C	splice_region_variant, intron_variant		ENST00000555619.6	NP_006423.1
NPC2	NM_001363688.1 link	c.*326A>C	3_prime_UTR_variant	4/4		NP_001350617.1
NPC2	NM_001375440.1 link	c.364-4A>C	splice_region_variant, intron_variant			NP_001362369.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NPC2	ENST00000555619.6 link	c.442-4A>C		splice_region_variant, intron_variant		1	NM_006432.5	ENSP00000451112.2		P61916-1

Frequencies

GnomAD3 genomes

AF:

0.00769

AC:

1170

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0231

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00190

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00116

Gnomad SAS

AF:

0.0319

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00575

GnomAD3 exomes

AF:

0.00621

AC:

1547

AN:

249162

Hom.:

AF XY:

0.00741

AC XY:

1000

AN XY:

134882

show subpopulations

Gnomad AFR exome

AF:

0.0255

Gnomad AMR exome

AF:

0.000723

Gnomad ASJ exome

AF:

0.0000993

Gnomad EAS exome

AF:

0.000544

Gnomad SAS exome

AF:

0.0349

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000144

Gnomad OTH exome

AF:

0.00196

GnomAD4 exome

AF:

0.00285

AC:

4158

AN:

1459788

Hom.:

100

Cov.:

AF XY:

0.00374

AC XY:

2719

AN XY:

726380

show subpopulations

Gnomad4 AFR exome

AF:

0.0259

Gnomad4 AMR exome

AF:

0.000783

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.000353

Gnomad4 SAS exome

AF:

0.0342

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000666

Gnomad4 OTH exome

AF:

0.00337

GnomAD4 genome

AF:

0.00767

AC:

1168

AN:

152286

Hom.:

Cov.:

AF XY:

0.00788

AC XY:

587

AN XY:

74464

show subpopulations

Gnomad4 AFR

AF:

0.0231

Gnomad4 AMR

AF:

0.00189

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000966

Gnomad4 SAS

AF:

0.0315

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.00569

Alfa

AF:

0.00220

Hom.:

Bravo

AF:

0.00742

Asia WGS

AF:

0.0190

AC:

AN:

3478

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:4

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Sep 21, 2017	- -
Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 12, 2021	- -

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	May 21, 2014	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -

Niemann-Pick disease, type C2

Benign:2

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -

Niemann-Pick disease, type C1

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

1.5

DANN

Benign

0.56

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000080

dbscSNV1_RF

Benign

0.0060

SpliceAI score (max)

0.17

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over