9-99129103-A-G
Variant summary
Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS2
The NM_004612.4(TGFBR1):c.343+3A>G variant causes a splice region, intron change. The variant allele was found at a frequency of 0.0000198 in 1,613,606 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Consequence
NM_004612.4 splice_region, intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -7 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes AF: 0.0000197 AC: 3AN: 152224Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.00000800 AC: 2AN: 249846Hom.: 0 AF XY: 0.00000740 AC XY: 1AN XY: 135136
GnomAD4 exome AF: 0.0000198 AC: 29AN: 1461382Hom.: 0 Cov.: 31 AF XY: 0.0000220 AC XY: 16AN XY: 726922
GnomAD4 genome AF: 0.0000197 AC: 3AN: 152224Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1AN XY: 74378
ClinVar
Submissions by phenotype
Familial thoracic aortic aneurysm and aortic dissection Uncertain:2Benign:1
This sequence change falls in intron 2 of the TGFBR1 gene. It does not directly change the encoded amino acid sequence of the TGFBR1 protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs374717754, gnomAD 0.002%). This variant has not been reported in the literature in individuals affected with TGFBR1-related conditions. ClinVar contains an entry for this variant (Variation ID: 213854). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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. -
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The c.343+3A>G intronic variant results from an A to G substitution 3 nucleotides after coding exon 2 in the TGFBR1 gene. This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will not have any significant effect on splicing. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
not specified Uncertain:1
Note this variant was found in clinical genetic testing performed by one or more labs who may also submit to ClinVar. Thus any internal case data may overlap with the internal case data of other labs. The interpretation reviewed below is that of the Stanford Center for Inherited Cardiovascular Disease. IVS2+3 A>G (c.343+3 A>G) in TGFBR1 Based on the data reviewed below we consider this variant to be a variant of uncertain significance, The variant appears to be novel. The variant changes the A at the +3 position of the splice junction to a G. While this position in the splice junction is most frequently an A it is also often a G. In TGFBR1 specificaly the A at c.343+3 is conserved across species. The testing lab reports that multiple in silico splice algorithms predict that this variant does not affect splicing. There are two splice variants listed in the professional version of HGMD. We have access to one in the public version and this appears to be reported as associated with cancer risk. Per a "clinical utility gene card" in the European Journal of Human Genetics by Dr. Loeys' group, splicing variants have been reported in association with disease (Arslan-Kirchner et al 2011). In total the variant has not been seen in ~6500 individuals from publicly available population datasets. In addition, splicing variants as a class appear to be rare in this gene. This variant is not listed in the NHLBI Exome Sequencing Project dataset, which currently includes variant calls on ~6500 Caucasian and African American individuals (as of March 11th, 2013). Only one splicing variant is listed in this database: c.341+1 G>A (rs144775920). That variant was seen in 1 out of ~6500 individuals. No nonsense or frameshift variants are listed in NHLBI ESP. IVS2+3 A>G is also not listed in dbSNP or 1000 genomes (as of March 11th, 2013). -
not provided Uncertain:1
Has not been previously published as pathogenic or benign to our knowledge; Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this variant does not alter splicing -
Loeys-Dietz syndrome Benign:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at