9-99105216-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_004612.4(TGFBR1):c.11C>T(p.Ala4Val) 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. 13/21 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. A4T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000043 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TGFBR1 NM_004612.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.647

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, TGFBR1
• BP4: Computational evidence support a benign effect (MetaRNN=0.265077).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TGFBR1	NM_004612.4	c.11C>T	p.Ala4Val	missense_variant	1/9	ENST00000374994.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TGFBR1	ENST00000374994.9	c.11C>T	p.Ala4Val	missense_variant	1/9	1	NM_004612.4	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000430 AC: 4 AN: 930960 Hom.: 0 Cov.: 30 AF XY: 0.00000687 AC XY: 3 AN XY: 436946

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000363

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 23, 2022

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. 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) performed at Invitae indicates that this missense variant is not expected to disrupt TGFBR1 protein function. ClinVar contains an entry for this variant (Variation ID: 841963). This variant has not been reported in the literature in individuals affected with TGFBR1-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the gnomAD database. This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 4 of the TGFBR1 protein (p.Ala4Val). -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Feb 07, 2020

The TGFBR1 c.11C>T; p.Ala4Val variant (rs1331965992), to our knowledge, is not reported in the medical literature but is reported in the Leiden open variation database (see link). This variant is absent from general population databases (Exome Variant Server, Genome Aggregation Database), indicating it is not a common polymorphism. The alanine at codon 4 is weakly conserved, and computational analyses (SIFT, PolyPhen-2) predict that this variant is tolerated. Due to limited information, the clinical significance of the p.Ala4Val variant is uncertain at this time. References: Link to Leiden open variation database for TGFBR1: https://databases.lovd.nl/shared/variants/TGFBR1/unique -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Benign	-0.042	T
BayesDel_noAF	Benign	-0.30
Cadd	Benign	20
Dann	Uncertain	1.0
DEOGEN2	Benign	0.32	T;.;.
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.32
FATHMM_MKL	Benign	0.35	N
LIST_S2	Benign	0.59	T;T;T
M_CAP	Pathogenic	0.98	D
MetaRNN	Benign	0.27	T;T;T
MetaSVM	Benign	-0.55	T
MutationAssessor	Benign	0.0	N;N;N
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-0.47	N;N;N
REVEL	Benign	0.26
Sift	Benign	0.42	T;D;T
Sift4G	Benign	0.32	T;T;T
Polyphen		0.48	P;D;.
Vest4		0.17
MutPred		0.32		Gain of sheet (P = 0.0043);Gain of sheet (P = 0.0043);Gain of sheet (P = 0.0043);
MVP		0.70
MPC		0.51
ClinPred		0.62	D
GERP RS		0.66
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		3.2
Varity_R		0.044
gMVP		0.51

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: rs1331965992; hg19: chr9-101867498;