chr9-99137916-T-TTGG

Position:

• chr9-99137916-T-TTGG

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PM4_Supporting PP5_Moderate

The NM_004612.4(TGFBR1):​c.633_635dup​(p.Gly212_Lys212insGly) variant causes a inframe insertion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TGFBR1 NM_004612.4 inframe_insertion
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.0960

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 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 15 uncertain in NM_004612.4
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_004612.4. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 9-99137916-T-TTGG is Pathogenic according to our data. Variant chr9-99137916-T-TTGG is described in ClinVar as [Pathogenic]. Clinvar id is 520221.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TGFBR1	NM_004612.4	c.633_635dup	p.Gly212_Lys212insGly	inframe_insertion	4/9	ENST00000374994.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TGFBR1	ENST00000374994.9	c.633_635dup	p.Gly212_Lys212insGly	inframe_insertion	4/9	1	NM_004612.4	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 21, 2016

The c.633_635dupTGG pathogenic mutation (also known as p.G212dup), located in coding exon 4 of the TGFBR1 gene, results from an in-frame duplication of TGG at nucleotide positions 633 to 635. This results in the duplication of an extra residue between codons 212 and 213. This alteration was confirmed as de novo in a proband tested by our laboratory whose clinical features are consistent with Loeys-Dietz syndrome. Based on the available evidence, c.633_635dupTGG is classified as a pathogenic mutation. -

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: rs1554700603; hg19: chr9-101900198;