chr14-74480277-G-A

Variant names:

• chr14-74480277-G-A
• rs766378122
• NM_006432.5:c.453C>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Moderate BP6_Moderate BP7

The NM_006432.5(NPC2):​c.453C>T​(p.Leu151Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. L151L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NPC2 NM_006432.5 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.681
• Publications: 0 publications found

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]

SYNDIG1L (HGNC:32388): (synapse differentiation inducing 1 like) Predicted to be located in Golgi apparatus. Predicted to be integral component of membrane. Predicted to be active in intracellular membrane-bounded organelle and membrane. [provided by Alliance of Genome Resources, Apr 2022]

MIR4709 (HGNC:41690): (microRNA 4709) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (REVEL=0.029).
• BP6: Variant 14-74480277-G-A is Benign according to our data. Variant chr14-74480277-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 1552790.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.681 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006432.5. 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
	NPC2	NM_006432.5	MANE Select	c.453C>T	p.Leu151Leu	synonymous	Exon 5 of 5	NP_006423.1	A0A024R6C0
	NPC2	NM_001375440.1		c.375C>T	p.Leu125Leu	synonymous	Exon 4 of 4	NP_001362369.1	P61916-2
	NPC2	NM_001363688.1		c.*341C>T		3_prime_UTR	Exon 4 of 4	NP_001350617.1	G3V3E8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NPC2	ENST00000555619.6	TSL:1 MANE Select	c.453C>T	p.Leu151Leu	synonymous	Exon 5 of 5	ENSP00000451112.2	P61916-1
	NPC2	ENST00000557510.5	TSL:1	c.*341C>T		3_prime_UTR	Exon 4 of 4	ENSP00000451206.1	G3V3E8
	NPC2	ENST00000553490.5	TSL:2	c.469C>T	p.Leu157Leu	synonymous	Exon 5 of 5	ENSP00000451180.1	G3V3D1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Niemann-Pick disease, type C2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.53
CADD	Benign	8.4
DANN	Benign	0.68
PhyloP100		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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

dbSNP: rs766378122; hg19: chr14-74946980;