9-136518652-G-C

Variant names:

• chr9-136518652-G-C
• rs376951155
• NM_017617.5:c.1038C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017617.5(NOTCH1):​c.1038C>G​(p.His346Gln) 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 benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. H346H) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: NOTCH1 NM_017617.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.27
• 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

LOC124902310 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.23806214).

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.1038C>G	p.His346Gln	missense	Exon 6 of 34	NP_060087.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NOTCH1	ENST00000651671.1	MANE Select	c.1038C>G	p.His346Gln	missense	Exon 6 of 34	ENSP00000498587.1
	NOTCH1	ENST00000680133.1		c.1038C>G	p.His346Gln	missense	Exon 6 of 33	ENSP00000505319.1
	NOTCH1	ENST00000680668.1		c.1038C>G	p.His346Gln	missense	Exon 6 of 33	ENSP00000506336.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Oct 28, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.H346Q variant (also known as c.1038C>G), located in coding exon 6 of the NOTCH1 gene, results from a C to G substitution at nucleotide position 1038. The histidine at codon 346 is replaced by glutamine, 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. Based on the available evidence, the clinical significance of this variant remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	0.80
DANN	Benign	0.85
DEOGEN2	Uncertain	0.67	D
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.047	N
LIST_S2	Benign	0.62	T
M_CAP	Benign	0.048	D
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-0.90	T
MutationAssessor	Benign	1.4	L
PhyloP100		-2.3
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.4	N
REVEL	Benign	0.28
Sift	Benign	0.27	T
Sift4G	Benign	0.28	T
Polyphen		0.0	B
Vest4		0.24
MutPred		0.66		Loss of glycosylation at T349 (P = 0.1429)
MVP		0.50
MPC		0.38
ClinPred		0.22	T
GERP RS		-10
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.051
Mutation Taster		=87/13	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs376951155; hg19: chr9-139413104;