chr7-44520815-A-T

Position:

• chr7-44520815-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001101648.2(NPC1L1):​c.3086T>A​(p.Leu1029Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: NPC1L1 NM_001101648.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.23

Genes affected

NPC1L1 (HGNC:7898): (NPC1 like intracellular cholesterol transporter 1) The protein encoded by this gene is a multi-pass membrane protein. It contains a conserved N-terminal Niemann-Pick C1 (NPC1) domain and a putative sterol-sensing domain (SSD) which includes a YQRL motif functioning as a plasma membrane to trans-Golgi network transport signal in other proteins. This protein takes up free cholesterol into cells through vesicular endocytosis and plays a critical role in the absorption of intestinal cholesterol. It also has the ability to transport alpha-tocopherol (vitamin E). The drug ezetimibe targets this protein and inhibits the absorption of intestinal cholesterol and alpha-tocopherol. In addition, this protein may play a critical role in regulating lipid metabolism. Polymorphic variations in this gene are associated with plasma total cholesterol and low-density lipoprotein cholesterol (LDL-C) levels and coronary heart disease (CHD) risk. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.794

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NPC1L1	NM_001101648.2	c.3086T>A	p.Leu1029Gln	missense_variant	14/19	ENST00000381160.8	NP_001095118.1
NPC1L1	NM_013389.3	c.3086T>A	p.Leu1029Gln	missense_variant	14/20		NP_037521.2
NPC1L1	XM_011515326.4	c.2891T>A	p.Leu964Gln	missense_variant	13/18		XP_011513628.1
NPC1L1	XM_011515328.3	c.1445T>A	p.Leu482Gln	missense_variant	11/16		XP_011513630.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NPC1L1	ENST00000381160.8	c.3086T>A	p.Leu1029Gln	missense_variant	14/19	1	NM_001101648.2	ENSP00000370552	P1
NPC1L1	ENST00000289547.8	c.3086T>A	p.Leu1029Gln	missense_variant	14/20	1		ENSP00000289547
NPC1L1	ENST00000546276.5	c.2948T>A	p.Leu983Gln	missense_variant	13/18	1		ENSP00000438033

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 29, 2016

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: Not reported. No information available. Gene is associated with hyperlipidemia -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.060	T;T;.
Eigen	Benign	0.15
Eigen_PC	Benign	0.18
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.89	D;D;D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.79	D;D;D
MetaSVM	Uncertain	0.25	D
MutationAssessor	Benign	0.21	N;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.38	T
PROVEAN	Benign	0.42	N;N;N
REVEL	Pathogenic	0.66
Sift	Benign	0.098	T;T;T
Sift4G	Uncertain	0.039	D;T;T
Polyphen		0.99	D;.;.
Vest4		0.73
MutPred		0.53		Gain of disorder (P = 0.0188);.;Gain of disorder (P = 0.0188);
MVP		0.93
MPC		0.53
ClinPred		0.83	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.22
gMVP		0.63

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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

Other links and lift over

dbSNP: rs1060499885; hg19: chr7-44560414;