rs863223776
Variant summary
Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2PM5PP3_Strong
The NM_181486.4(TBX5):c.755G>T(p.Ser252Ile) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/2 splice prediction tools predicting alterations to normal splicing. 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. S252N) has been classified as Pathogenic.
Frequency
Consequence
NM_181486.4 missense, splice_region
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_pathogenic. Variant got 8 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TBX5 | NM_181486.4 | c.755G>T | p.Ser252Ile | missense_variant, splice_region_variant | 7/9 | ENST00000405440.7 | |
TBX5 | NM_000192.3 | c.755G>T | p.Ser252Ile | missense_variant, splice_region_variant | 7/9 | ||
TBX5 | NM_080717.4 | c.605G>T | p.Ser202Ile | missense_variant, splice_region_variant | 6/8 | ||
TBX5 | XM_017019912.2 | c.803G>T | p.Ser268Ile | missense_variant, splice_region_variant | 7/9 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TBX5 | ENST00000405440.7 | c.755G>T | p.Ser252Ile | missense_variant, splice_region_variant | 7/9 | 1 | NM_181486.4 | P1 | |
TBX5 | ENST00000310346.8 | c.755G>T | p.Ser252Ile | missense_variant, splice_region_variant | 7/9 | 1 | P1 | ||
TBX5 | ENST00000349716.9 | c.605G>T | p.Ser202Ile | missense_variant, splice_region_variant | 6/8 | 1 | |||
TBX5 | ENST00000526441.1 | c.755G>T | p.Ser252Ile | missense_variant, splice_region_variant | 6/7 | 1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD4 exome Cov.: 31
GnomAD4 genome ? Cov.: 32
ClinVar
Submissions by phenotype
Aortic valve disease 2 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | May 22, 2016 | Algorithms developed to predict the effect of nucleotide changes on mRNA splicing suggest that this intronic variant may alter mRNA splicing, but this prediction has not been confirmed by published transcriptional studies. Experimental studies have reported conflicting data regarding the effect of this missense variant. No effect was reported on several aspects of protein function including: DNA binding, ANF pre-mRNA splicing, interaction with NKx2.5 and recruitment of TAZ (PMID: 19648116, 11555635, 16332960, 26859351). However, a deleterious effect was reported on the interaction with NKx2.5 (PMID: 12499378), while in another study, this variant was found to reduce interaction with the nucleosome remodeling and deacetylase repressor complex (NuRD) (PMID: 26859351).  The clinical significance of these findings is not fully understood. This sequence change has been reported in an individual affected with Holt-Oram syndrome (PMID: 11183182). This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with isoleucine at codon 252 of the TBX5 protein (p.Ser252Ile). The serine residue is highly conserved and there is a large physicochemical difference between serine and isoleucine. It also falls at the last nucleotide of exon 7 of the TBX5 coding sequence. In summary, this sequence change has been reported in an affected individual, and has an unknown effect on splicing. However, there is some  conflicting data regarding the effect of this change on protein function. For these reasons it has been classified as a Variant of Uncertain Significance. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at