9-127825711-G-T

Variant names:

• chr9-127825711-G-T
• rs1554810373
• NM_001114753.3:c.673C>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001114753.3(ENG):​c.673C>A​(p.Pro225Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000139 in 1,435,834 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 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. P225Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ENG NM_001114753.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.62
• Publications: 0 publications found

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]

ENG Gene-Disease associations (from GenCC):

• telangiectasia, hereditary hemorrhagic, type 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, ClinGen
• hereditary hemorrhagic telangiectasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• juvenile polyposis syndrome

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3002294).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ENG	NM_001114753.3	c.673C>A	p.Pro225Thr	missense_variant	Exon 5 of 15	ENST00000373203.9	NP_001108225.1
ENG	NM_000118.4	c.673C>A	p.Pro225Thr	missense_variant	Exon 5 of 14		NP_000109.1
ENG	NM_001278138.2	c.127C>A	p.Pro43Thr	missense_variant	Exon 5 of 15		NP_001265067.1
ENG	NM_001406715.1	c.673C>A	p.Pro225Thr	missense_variant	Exon 5 of 8		NP_001393644.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ENG	ENST00000373203.9	c.673C>A	p.Pro225Thr	missense_variant	Exon 5 of 15	1	NM_001114753.3	ENSP00000362299.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000139 AC: 2 AN: 1435834 Hom.: 0 Cov.: 34 AF XY: 0.00000140 AC XY: 1 AN XY: 712304

African (AFR) AF: 0.00 AC: 0 AN: 33174

American (AMR) AF: 0.00 AC: 0 AN: 43240

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25276

East Asian (EAS) AF: 0.0000256 AC: 1 AN: 39100

South Asian (SAS) AF: 0.00 AC: 0 AN: 83856

European-Finnish (FIN) AF: 0.0000220 AC: 1 AN: 45446

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4186

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1102330

Other (OTH) AF: 0.00 AC: 0 AN: 59226

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary hemorrhagic telangiectasia Uncertain:1

Apr 10, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 225 of the ENG protein (p.Pro225Thr). 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: 2158943). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ENG protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	23
DANN	Benign	0.96
DEOGEN2	Benign	0.29	T;T;.
Eigen	Benign	-0.048
Eigen_PC	Benign	-0.069
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.77	T;T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.30	T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	2.0	M;.;M
PhyloP100		2.6
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	-1.3	N;.;N
REVEL	Benign	0.067
Sift	Benign	0.54	T;.;T
Sift4G	Uncertain	0.058	T;T;T
Polyphen		0.91	P;.;.
Vest4		0.42
MutPred		0.46		Gain of catalytic residue at P225 (P = 0.0058);.;Gain of catalytic residue at P225 (P = 0.0058);
MVP		0.62
MPC		0.69
ClinPred		0.64	D
GERP RS		3.5
Varity_R		0.13
gMVP		0.59
Mutation Taster		=79/21	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: rs1554810373; hg19: chr9-130587990;