3-30672317-GGACCTC-G

Position:

• chr3-30672317-GGACCTC-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PM4 PP3

The NM_003242.6(TGFBR2):​c.1135_1140del​(p.Asp379_Leu380del) variant causes a inframe deletion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. D379D) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TGFBR2 NM_003242.6 inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 10.0

Genes affected

TGFBR2 (HGNC:11773): (transforming growth factor beta receptor 2) The protein encoded by this gene is a transmembrane protein that has a protein kinase domain, forms a heterodimeric complex with TGF-beta receptor type-1, and binds TGF-beta. This receptor/ligand complex phosphorylates proteins, which then enter the nucleus and regulate the transcription of genes related to cell proliferation, cell cycle arrest, wound healing, immunosuppression, and tumorigenesis. Mutations in this gene have been associated with Marfan Syndrome, Loeys-Deitz Aortic Aneurysm Syndrome, and the development of various types of tumors. Alternatively spliced transcript variants encoding different isoforms have been characterized. [provided by RefSeq, Aug 2017]

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 2 benign, 13 uncertain in NM_003242.6
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_003242.6.
• PP3: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TGFBR2	NM_003242.6	c.1135_1140del	p.Asp379_Leu380del	inframe_deletion	4/7	ENST00000295754.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TGFBR2	ENST00000295754.10	c.1135_1140del	p.Asp379_Leu380del	inframe_deletion	4/7	1	NM_003242.6	P1
TGFBR2	ENST00000359013.4	c.1210_1215del	p.Asp404_Leu405del	inframe_deletion	5/8	1
TGFBR2	ENST00000672866.1	n.2731_2736del		non_coding_transcript_exon_variant	4/7

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

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

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 23, 2017

In summary, this variant is a novel in-frame deletion with an uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the deleted amino acids is currently unknown. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a TGFBR2-related disease. This sequence change deletes 6 nucleotides from exon 4 of the TGFBR2 mRNA (c.1135_1140delGACCTC). This leads to the deletion of 2 amino acid residues in the TGFBR2 protein (p.Asp379_Leu380del) but otherwise preserves the integrity of the reading frame. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1553630282; hg19: chr3-30713809;