rs1555727841

Variant names:

• chr19-15180103-C-T
• rs1555727841
• NM_000435.3:c.3296G>A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000435.3(NOTCH3):​c.3296G>A​(p.Cys1099Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,280 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NOTCH3 NM_000435.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4 O:1
• Conservation: PhyloP100: 7.16

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 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.996
• PP5: Variant 19-15180103-C-T is Pathogenic according to our data. Variant chr19-15180103-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 447832.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NOTCH3	NM_000435.3	c.3296G>A	p.Cys1099Tyr	missense_variant	Exon 20 of 33	ENST00000263388.7	NP_000426.2
NOTCH3	XM_005259924.5	c.3140G>A	p.Cys1047Tyr	missense_variant	Exon 19 of 32		XP_005259981.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NOTCH3	ENST00000263388.7	c.3296G>A	p.Cys1099Tyr	missense_variant	Exon 20 of 33	1	NM_000435.3	ENSP00000263388.1
NOTCH3	ENST00000601011.1	c.3137G>A	p.Cys1046Tyr	missense_variant	Exon 19 of 23	5		ENSP00000473138.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460280 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 726500

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

May 08, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces cysteine, which is neutral and slightly polar, with tyrosine, which is neutral and polar, at codon 1099 of the NOTCH3 protein (p.Cys1099Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with clinical features of cerebral arteriopathy with subcortical infarcts and leukoencephalopathy (PMID: 17879445, 34851492; Invitae). ClinVar contains an entry for this variant (Variation ID: 447832). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt NOTCH3 protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

Aug 30, 2022

Athena Diagnostics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has been identified in at least one individual with clinical features of 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. -

NOTCH3-related disorder Pathogenic:1

Aug 05, 2024

PreventionGenetics, part of Exact Sciences

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The NOTCH3 c.3296G>A variant is predicted to result in the amino acid substitution p.Cys1099Tyr. This variant was reported in individuals with CADASIL (Ferreira et al. 2007. PubMed ID: 17879445; Almeida et al. 2021. PubMed ID: 34851492). This variant has not been reported in a large population database, indicating this variant is rare. This variant is interpreted as likely pathogenic. -

Lateral meningocele syndrome;C3809084:Myofibromatosis, infantile, 2;C4551768:Cerebral arteriopathy, autosomal dominant, with subcortical infarcts and leukoencephalopathy, type 1 Pathogenic:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sneddon syndrome;C1851710:Lateral meningocele syndrome;C3809084:Myofibromatosis, infantile, 2;C4551768:Cerebral arteriopathy, autosomal dominant, with subcortical infarcts and leukoencephalopathy, type 1 Other:1

-

GenomeConnect - CureCADASIL

Significance: not provided

Review Status: no classification provided

Collection Method: phenotyping only

Variant classified as Likely pathogenic and reported on 04-18-2022 by Lab or GTR ID 500031. GenomeConnect-CureCADASIL assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. Registry team members make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D;D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.86	D;T
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	1.0	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.4	H;.
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-9.6	D;.
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.99
MutPred		1.0		Loss of disorder (P = 0.0854);.;
MVP		1.0
MPC		1.7
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.93
gMVP		0.99

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: rs1555727841; hg19: chr19-15290914;