chr7-44515928-A-T

Variant names:

• chr7-44515928-A-T
• NM_001101648.2:c.3671T>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001101648.2(NPC1L1):​c.3671T>A​(p.Ile1224Asn) variant causes a missense change involving the alteration of a conserved nucleotide. 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: 8.65
• Publications: 0 publications found

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

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.91

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001101648.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NPC1L1	NM_001101648.2	MANE Select	c.3671T>A	p.Ile1224Asn	missense	Exon 18 of 19	NP_001095118.1	A0A0C4DFX6
	NPC1L1	NM_013389.3		c.3752T>A	p.Ile1251Asn	missense	Exon 19 of 20	NP_037521.2	Q9UHC9-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NPC1L1	ENST00000381160.8	TSL:1 MANE Select	c.3671T>A	p.Ile1224Asn	missense	Exon 18 of 19	ENSP00000370552.3	A0A0C4DFX6
	NPC1L1	ENST00000289547.8	TSL:1	c.3752T>A	p.Ile1251Asn	missense	Exon 19 of 20	ENSP00000289547.4	Q9UHC9-1
	NPC1L1	ENST00000546276.5	TSL:1	c.3533T>A	p.Ile1178Asn	missense	Exon 17 of 18	ENSP00000438033.1	A0A0C4DGG6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.77	D
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.91	D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Pathogenic	3.4	M
PhyloP100		8.6
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-6.3	D
REVEL	Pathogenic	0.77
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Vest4		0.91
MutPred		0.70		Loss of stability (P = 0.0189)
MVP		0.99
MPC		0.87
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.89
gMVP		0.96
Mutation Taster		=41/59	disease causing

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

Other links and lift over

hg19: chr7-44555527;