rs995523352

chr19-15181004-A-Cchr19-15181004-A-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PS1_Moderate PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000435.3(NOTCH3):c.2951T>G(p.Phe984Cys) variant causes a missense change involving the alteration of a non-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 Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NOTCH3 NM_000435.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 2.43

Genes affected

NOTCH3 (HGNC:7883): (notch receptor 3) This gene encodes the third discovered human homologue of the Drosophilia melanogaster type I membrane protein notch. In Drosophilia, notch interaction with its cell-bound ligands (delta, serrate) establishes an intercellular signalling pathway that plays a key role in neural development. Homologues of the notch-ligands have also been identified in human, but precise interactions between these ligands and the human notch homologues remains to be determined. Mutations in NOTCH3 have been identified as the underlying cause of cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PS1: Transcript NM_000435.3 (NOTCH3) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 5 benign, 4 uncertain in NM_000435.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99
• PP5: Variant 19-15181004-A-C is Pathogenic according to our data. Variant chr19-15181004-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 447818.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-15181004-A-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NOTCH3	NM_000435.3	c.2951T>G	p.Phe984Cys	missense_variant	18/33	ENST00000263388.7
NOTCH3	XM_005259924.5	c.2795T>G	p.Phe932Cys	missense_variant	17/32

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NOTCH3	ENST00000263388.7	c.2951T>G	p.Phe984Cys	missense_variant	18/33	1	NM_000435.3	P1
NOTCH3	ENST00000601011.1	c.2792T>G	p.Phe931Cys	missense_variant	17/23	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Athena Diagnostics	May 11, 2022	This variant has been identified in at least one individual with CADASIL. This variant has not been reported in large, multi-ethnic general populations (http://gnomad.broadinstitute.org). This variant alters a critical location within the protein, and is expected to severely affect function and cause disease. Greater than 90% of pathogenic variants identified in NOTCH3 involve the gain or loss of a cysteine residue within the epidermal growth factor (EGF)-like repeat domain. -
Likely pathogenic, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Dec 08, 2020	The NOTCH3 c.2951T>G; p.Phe984Cys variant (rs995523352) has been described in the literature in several individuals diagnosed with CADASIL (Abramycheva 2015, Chen 2017, Escary 2000). The variant is reported in the ClinVar database (Variation ID: 447818) and is absent from general population databases (Exome Variant Server, Genome Aggregation Database), indicating it is not a common polymorphism. The phenylalanine at codon 984 is located in exon 18, is highly conserved, and computational analyses predict that this variant is deleterious (REVEL: 0.762). Additionally, most pathogenic NOTCH3 variants occur in exons 2-24 and either create or destroy a cysteine residue within an EGF-like domain (Rutten 2014). Based on available information, this variant is considered to be likely pathogenic. References: Abramycheva N et al. New mutations in the Notch3 gene in patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leucoencephalopathy (CADASIL). J Neurol Sci. 2015 Feb 15;349(1-2):196-201. Chen S et al. Clinical features and mutation spectrum in Chinese patients with CADASIL: A multicenter retrospective study. CNS Neurosci Ther. 2017 Sep;23(9):707-716. Escary JL et al. Evaluation of DHPLC analysis in mutational scanning of Notch3, a gene with a high G-C content. Hum Mutat. 2000 Dec;16(6):518-26. Rutten JW et al. Interpretation of NOTCH3 mutations in the diagnosis of CADASIL. Expert Rev Mol Diagn. 2014 Jun;14(5):593-603. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.30
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.76	D;T
Eigen	Uncertain	0.22
Eigen_PC	Benign	0.034
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.71	T;T
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.9	H;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-5.1	D;.
REVEL	Pathogenic	0.76
Sift	Uncertain	0.0010	D;.
Sift4G	Uncertain	0.0020	D;D
Polyphen		0.99	D;.
Vest4		0.80
MutPred		0.94		Gain of disorder (P = 0.0271);.;
MVP		1.0
MPC		1.3
ClinPred		0.98	D
GERP RS		1.8
Varity_R		0.41
gMVP		0.92

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

LitVar

Other links and lift over

dbSNP: rs995523352; hg19: chr19-15291815;