chr9-136503326-T-C

Variant names:

• chr9-136503326-T-C
• rs375408767
• NM_017617.5:c.5023A>G

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_017617.5(NOTCH1):​c.5023A>G​(p.Ile1675Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000011 in 1,460,434 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I1675L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: NOTCH1 NM_017617.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 2.92
• Publications: 0 publications found

Genes affected

NOTCH1 (HGNC:7881): (notch receptor 1) This gene encodes a member of the NOTCH family of proteins. Members of this Type I transmembrane protein family share structural characteristics including an extracellular domain consisting of multiple epidermal growth factor-like (EGF) repeats, and an intracellular domain consisting of multiple different domain types. Notch signaling is an evolutionarily conserved intercellular signaling pathway that regulates interactions between physically adjacent cells through binding of Notch family receptors to their cognate ligands. The encoded preproprotein is proteolytically processed in the trans-Golgi network to generate two polypeptide chains that heterodimerize to form the mature cell-surface receptor. This receptor plays a role in the development of numerous cell and tissue types. Mutations in this gene are associated with aortic valve disease, Adams-Oliver syndrome, T-cell acute lymphoblastic leukemia, chronic lymphocytic leukemia, and head and neck squamous cell carcinoma. [provided by RefSeq, Jan 2016]

NOTCH1 Gene-Disease associations (from GenCC):

• Adams-Oliver syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Illumina, Orphanet
• Adams-Oliver syndrome 5

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
• aortic valve disease 1

  Inheritance: AD Classification: STRONG Submitted by: G2P, PanelApp Australia
• connective tissue disorder

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• leukodystrophy

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• familial bicuspid aortic valve

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.17227769).
• BS2: High AC in GnomAdExome4 at 16 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017617.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NOTCH1	NM_017617.5	MANE Select	c.5023A>G	p.Ile1675Val	missense	Exon 27 of 34	NP_060087.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NOTCH1	ENST00000651671.1	MANE Select	c.5023A>G	p.Ile1675Val	missense	Exon 27 of 34	ENSP00000498587.1
	NOTCH1	ENST00000680133.1		c.4909A>G	p.Ile1637Val	missense	Exon 26 of 33	ENSP00000505319.1
	NOTCH1	ENST00000680668.1		c.4909A>G	p.Ile1637Val	missense	Exon 26 of 33	ENSP00000506336.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000162 AC: 4 AN: 247600 AF XY: 0.0000148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000468

Gnomad NFE exome AF: 0.0000268

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000110 AC: 16 AN: 1460434 Hom.: 0 Cov.: 34 AF XY: 0.00000964 AC XY: 7 AN XY: 726482

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86252

European-Finnish (FIN) AF: 0.0000192 AC: 1 AN: 52214

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.0000135 AC: 15 AN: 1111832

Other (OTH) AF: 0.00 AC: 0 AN: 60362

GnomAD4 genome Cov.: 33

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000117 AC: 1

ExAC AF: 0.0000248 AC: 3

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Adams-Oliver syndrome 5 Uncertain:2

Dec 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1675 of the NOTCH1 protein (p.Ile1675Val). This variant is present in population databases (rs375408767, gnomAD 0.005%). This variant has not been reported in the literature in individuals affected with NOTCH1-related conditions. ClinVar contains an entry for this variant (Variation ID: 409049). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt NOTCH1 protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

Mar 15, 2022

Genome-Nilou Lab

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Jan 12, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.I1675V variant (also known as c.5023A>G), located in coding exon 27 of the NOTCH1 gene, results from an A to G substitution at nucleotide position 5023. The isoleucine at codon 1675 is replaced by valine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

not provided Uncertain:1

Dec 10, 2020

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function

Aortic valve disease 1 Uncertain:1

Mar 15, 2022

Genome-Nilou Lab

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.13
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.79	T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.17	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.24	N
PhyloP100		2.9
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	0.040	N
REVEL	Benign	0.11
Sift	Benign	0.20	T
Sift4G	Benign	1.0	T
Polyphen		0.12	B
Vest4		0.13
MVP		0.34
MPC		0.78
ClinPred		0.19	T
GERP RS		4.9
Varity_R		0.30
Mutation Taster		=72/28	polymorphism

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

dbSNP: rs375408767; hg19: chr9-139397778;