rs727503471

Positions:

• chr9-99138083-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PP2 PP3_Moderate

The NM_004612.4(TGFBR1):​c.799A>G​(p.Asn267Asp) variant causes a missense change involving the alteration of a 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 Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TGFBR1 NM_004612.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 9.27

Genes affected

TGFBR1 (HGNC:11772): (transforming growth factor beta receptor 1) The protein encoded by this gene forms a heteromeric complex with type II TGF-beta receptors when bound to TGF-beta, transducing the TGF-beta signal from the cell surface to the cytoplasm. The encoded protein is a serine/threonine protein kinase. Mutations in this gene have been associated with Loeys-Dietz aortic aneurysm syndrome (LDAS). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_004612.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, TGFBR1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.842

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TGFBR1	NM_004612.4	c.799A>G	p.Asn267Asp	missense_variant	4/9	ENST00000374994.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TGFBR1	ENST00000374994.9	c.799A>G	p.Asn267Asp	missense_variant	4/9	1	NM_004612.4	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 01, 2014

Variant classified as Uncertain Significance - Favor Pathogenic. The Asn267Asp v ariant in TGFBR1 has not been previously reported in any other families with Loe ys-Dietz syndrome or TAAD, but was found to segregate with disease in one affect ed relative in this individual's family (LMM unpublished data). A variant result ing in a different amino acid change at the same position (Asn267His) had previo usly been reported in one individual with clinical features of Loeys-Dietz syndr ome and was reported to segregate in two children, who also had similar clinical features (Matyas 2006). Computational prediction tools and conservation analyse s suggest that the Asn267Asp variant may impact the protein, though this informa tion is not predictive enough to determine pathogenicity. In summary, while the available data on the Asn267Asp variant is suspicious for it to be pathogenic, t he clinical significance of this variant is uncertain. -

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 09, 2017

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. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has been reported in an individual affected with Loeys–Dietz syndrome (PMID: 24793577). ClinVar contains an entry for this variant (Variation ID: 165387). This variant is not present in population databases (ExAC no frequency). This sequence change replaces asparagine with aspartic acid at codon 267 of the TGFBR1 protein (p.Asn267Asp). The asparagine residue is highly conserved and there is a small physicochemical difference between asparagine and aspartic acid. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.030	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	28
DANN	Benign	0.97
DEOGEN2	Uncertain	0.43	T;.;.;.
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D;D
M_CAP	Uncertain	0.098	D
MetaRNN	Pathogenic	0.84	D;D;D;D
MetaSVM	Benign	-0.48	T
MutationAssessor	Benign	1.0	L;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-4.9	D;D;D;D
REVEL	Uncertain	0.42
Sift	Uncertain	0.027	D;D;D;D
Sift4G	Uncertain	0.032	D;T;D;D
Polyphen		0.99	D;P;.;.
Vest4		0.87
MutPred		0.56		Gain of ubiquitination at K268 (P = 0.1008);.;.;.;
MVP		0.88
MPC		3.5
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.94
gMVP		0.90

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: rs727503471; hg19: chr9-101900365;