rs1554578798
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000127.3(EXT1):c.1431del(p.Ser478ProfsTer10) variant causes a frameshift 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 (★★). Synonymous variant affecting the same amino acid position (i.e. P477P) has been classified as Benign. Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Consequence
EXT1
NM_000127.3 frameshift
NM_000127.3 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: -0.248
Genes affected
EXT1 (HGNC:3512): (exostosin glycosyltransferase 1) This gene encodes an endoplasmic reticulum-resident type II transmembrane glycosyltransferase involved in the chain elongation step of heparan sulfate biosynthesis. Mutations in this gene cause the type I form of multiple exostoses. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
?
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 8-117819780-AG-A is Pathogenic according to our data. Variant chr8-117819780-AG-A is described in ClinVar as [Pathogenic]. Clinvar id is 947295.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-117819780-AG-A is described in Lovd as [Likely_pathogenic]. Variant chr8-117819780-AG-A is described in Lovd as [Likely_pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
EXT1 | NM_000127.3 | c.1431del | p.Ser478ProfsTer10 | frameshift_variant | 6/11 | ENST00000378204.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
EXT1 | ENST00000378204.7 | c.1431del | p.Ser478ProfsTer10 | frameshift_variant | 6/11 | 1 | NM_000127.3 | P1 | |
EXT1 | ENST00000684189.1 | n.898del | non_coding_transcript_exon_variant | 6/11 | |||||
EXT1 | ENST00000437196.1 | c.*322del | 3_prime_UTR_variant, NMD_transcript_variant | 5/10 | 5 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Multiple congenital exostosis Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 15, 2022 | ClinVar contains an entry for this variant (Variation ID: 947295). For these reasons, this variant has been classified as Pathogenic. This premature translational stop signal has been observed in individual(s) with multiple osteochondromatosis (PMID: 18165274, 23262345). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Ser478Profs*10) in the EXT1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in EXT1 are known to be pathogenic (PMID: 10679937, 11391482, 19810120). - |
Pathogenic, no assertion criteria provided | clinical testing | Department of Cell Biology, School of Life Sciences, Central South University | Feb 14, 2020 | - - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Nov 02, 2021 | Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 23262345, 34012378, 18165274) - |
Computational scores
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Calibrated prediction
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Prediction
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at