NM_003238.6:c.199G>A
Variant summary
Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4BS1_SupportingBS2
The NM_003238.6(TGFB2):c.199G>A(p.Val67Met) variant causes a missense change. The variant allele was found at a frequency of 0.000271 in 1,614,122 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Consequence
NM_003238.6 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -6 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
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TGFB2 | NM_003238.6 | c.199G>A | p.Val67Met | missense_variant | Exon 1 of 7 | ENST00000366930.9 | NP_003229.1 | |
TGFB2 | NM_001135599.4 | c.199G>A | p.Val67Met | missense_variant | Exon 1 of 8 | NP_001129071.1 | ||
TGFB2 | NR_138148.2 | n.1565G>A | non_coding_transcript_exon_variant | Exon 1 of 7 | ||||
TGFB2 | NR_138149.2 | n.1565G>A | non_coding_transcript_exon_variant | Exon 1 of 8 |
Ensembl
Frequencies
GnomAD3 genomes AF: 0.000158 AC: 24AN: 152242Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.000103 AC: 26AN: 251318Hom.: 0 AF XY: 0.0000883 AC XY: 12AN XY: 135884
GnomAD4 exome AF: 0.000283 AC: 413AN: 1461880Hom.: 1 Cov.: 31 AF XY: 0.000271 AC XY: 197AN XY: 727240
GnomAD4 genome AF: 0.000158 AC: 24AN: 152242Hom.: 0 Cov.: 32 AF XY: 0.000148 AC XY: 11AN XY: 74370
ClinVar
Submissions by phenotype
Loeys-Dietz syndrome 4 Uncertain:4
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This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 67 of the TGFB2 protein (p.Val67Met). This variant is present in population databases (rs201761868, gnomAD 0.02%). This missense change has been observed in individual(s) with clinical features of TGFB2-related conditions (PMID: 28139901, 29543232). ClinVar contains an entry for this variant (Variation ID: 213839). 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 TGFB2 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. -
The TGFB2 c.199G>A; p.Val67Met variant (rs201761868) is reported in the literature in individuals affected with multiple aneurysms and/or pseudoaneurysm syndrome or thoracic aortic aneurysm/aortic dissection (D'Souza 2017, Weerakkody 2018). This variant is reported in ClinVar (Variation ID: 213839), and is found in the non-Finnish European population with an allele frequency of 0.023% (30/129,078 alleles) in the Genome Aggregation Database. Computational analyses are uncertain whether this variant is neutral or deleterious (REVEL: 0.272). Due to limited information, the clinical significance of this variant is uncertain at this time. References: D'Souza RS et al. Clinical and genetic characterization of adult patients presenting with non-syndromic vascular aneurysms and dissections. Int Angiol. 2017 Oct;36(5):417-427. PMID: 28139901. Weerakkody R et al. Targeted genetic analysis in a large cohort of familial and sporadic cases of aneurysm or dissection of the thoracic aorta. Genet Med. 2018 Nov;20(11):1414-1422. PMID: 29543232. -
Familial thoracic aortic aneurysm and aortic dissection Uncertain:3
The p.V67M variant (also known as c.199G>A), located in coding exon 1 of the TGFB2 gene, results from a G to A substitution at nucleotide position 199. The valine at codon 67 is replaced by methionine, an amino acid with highly similar properties. This alteration has been detected in a thoracic aortic aneurysm and dissection (TAAD) cohort (Weerakkody R et al. Genet. Med., 2018 11;20:1414-1422). This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
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This sequence change in TGFB2 is predicted to replace valine with methionine at codon 67, p.(Val67Met). The valine residue is highly conserved (100 vertebrates, UCSC), and is located in the TGFb propeptide. There is a small physicochemical difference between valine and methionine. The highest population minor allele frequency in gnomAD v4.1 is 0.04% (418/1,180,054 alleles, 1 homozygote) in the European (non-Finnish) population. This variant has been detected in individuals with aortic aneurysms and one individual with hypermobile Ehlers-Danlos syndrome (PMID: 28139901, 29543232). Computational evidence predicts a benign effect for the missense substitution (REVEL = 0.272). Based on the classification scheme RMH Modified ACMG Guidelines v1.6.1, this variant is classified as a VARIANT OF UNCERTAIN SIGNIFICANCE. Following criteria are met: BP4. -
not provided Uncertain:2
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Identified in an individual with aneurysm of the descending thoracoabdominal aorta and in an individual with multiple-aneurysms and/or pseudoaneurysm syndromes (MaPS) (PMID: 29543232, 28139901); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 22772371, 28139901, 29543232) -
not specified Uncertain:1
Variant summary: TGFB2 c.199G>A (p.Val67Met) results in a conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0001 in 251318 control chromosomes (gnomAD). The observed variant frequency is approximately 4 fold of the estimated maximal expected allele frequency for a pathogenic variant in TGFB2 causing Thoracic Aortic Aneurysms And Dissections phenotype (2.5e-05), strongly suggesting that the variant is benign. c.199G>A has been reported in the literature in individuals affected with Thoracic Aortic Aneurysms And Dissections (Boileau_2012, Weerakkody_2018) or multiple-aneurysms and/or pseudoaneurysm syndromes (DSouza_2017). These reports do not provide unequivocal conclusions about association of the variant with Thoracic Aortic Aneurysms And Dissections. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 29543232, 22772371, 28139901). Six submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -
Ehlers-Danlos syndrome Uncertain:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at