9-127824960-G-T

Variant names:

• chr9-127824960-G-T
• rs121918400
• NM_001114753.3:c.831C>A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001114753.3(ENG):​c.831C>A​(p.Tyr277*) variant causes a stop gained 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 28)
• Consequence: ENG NM_001114753.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.53

Genes affected

ENG (HGNC:3349): (endoglin) This gene encodes a homodimeric transmembrane protein which is a major glycoprotein of the vascular endothelium. This protein is a component of the transforming growth factor beta receptor complex and it binds to the beta1 and beta3 peptides with high affinity. Mutations in this gene cause hereditary hemorrhagic telangiectasia, also known as Osler-Rendu-Weber syndrome 1, an autosomal dominant multisystemic vascular dysplasia. This gene may also be involved in preeclampsia and several types of cancer. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2013]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-127824960-G-T is Pathogenic according to our data. Variant chr9-127824960-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 579302.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
ENG	NM_001114753.3	c.831C>A	p.Tyr277*	stop_gained	Exon 7 of 15	ENST00000373203.9	NP_001108225.1
ENG	NM_000118.4	c.831C>A	p.Tyr277*	stop_gained	Exon 7 of 14		NP_000109.1
ENG	NM_001278138.2	c.285C>A	p.Tyr95*	stop_gained	Exon 7 of 15		NP_001265067.1
ENG	NM_001406715.1	c.831C>A	p.Tyr277*	stop_gained	Exon 7 of 8		NP_001393644.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ENG	ENST00000373203.9	c.831C>A	p.Tyr277*	stop_gained	Exon 7 of 15	1	NM_001114753.3	ENSP00000362299.4
ENG	ENST00000344849.4	c.831C>A	p.Tyr277*	stop_gained	Exon 7 of 14	1		ENSP00000341917.3
ENG	ENST00000480266.6	c.285C>A	p.Tyr95*	stop_gained	Exon 7 of 15	2		ENSP00000479015.1

Frequencies

GnomAD3 genomes Cov.: 28

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 28

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Telangiectasia, hereditary hemorrhagic, type 1 Pathogenic:1

Sep 27, 2022

Petrovsky National Research Centre of Surgery, The Federal Agency for Scientific Organizations

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

We observed a c.831C>A (p.Y277*) genetic variant in heterozygous state in the ENG gene in proband (female, 71 y.o.) and her family members (son and niece) with hereditary hemorrhagic telangiectasia (HHT). ClinVar contains an entry for this variant (Variation ID: 579302) observed in individual(s) with HHT. Loss-of-function variants in the ENG gene are known to be pathogenic (PMID: 15879500, 20656886, 22385575, 25312062, 30251589). This variant is not observed at significant frequency in large population cohorts (gnomAD, LOVD). We assume that the c.831C>A (p.Y277*) variant could be classified as Pathogenic. -

Hereditary hemorrhagic telangiectasia Pathogenic:1

Nov 22, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Tyr277*) in the ENG gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ENG are known to be pathogenic (PMID: 15879500). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with ENG-related conditions. ClinVar contains an entry for this variant (Variation ID: 579302). For these reasons, this variant has been classified as Pathogenic. -

Cardiovascular phenotype Pathogenic:1

Mar 13, 2025

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Y277* pathogenic mutation (also known as c.831C>A), located in coding exon 7 of the ENG gene, results from a C to A substitution at nucleotide position 831. This changes the amino acid from a tyrosine to a stop codon within coding exon 7. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Pathogenic	0.70
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.79	D
Vest4		0.88
GERP RS		4.2

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.36		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.36		Position offset: -20

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs121918400; hg19: chr9-130587239;