rs121909186
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1PM2PP5_Moderate
The ENST00000242261.6(TWIST1):c.308_309insA(p.Tyr103Ter) variant causes a stop gained, 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. Y103Y) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Consequence
TWIST1
ENST00000242261.6 stop_gained, frameshift
ENST00000242261.6 stop_gained, frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 0.513
Genes affected
TWIST1 (HGNC:12428): (twist family bHLH transcription factor 1) This gene encodes a basic helix-loop-helix (bHLH) transcription factor that plays an important role in embryonic development. The encoded protein forms both homodimers and heterodimers that bind to DNA E box sequences and regulate the transcription of genes involved in cranial suture closure during skull development. This protein may also regulate neural tube closure, limb development and brown fat metabolism. This gene is hypermethylated and overexpressed in multiple human cancers, and the encoded protein promotes tumor cell invasion and metastasis, as well as metastatic recurrence. Mutations in this gene cause Saethre-Chotzen syndrome in human patients, which is characterized by craniosynostosis, ptosis and hypertelorism. [provided by RefSeq, Jul 2020]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 88 pathogenic variants in the truncated region.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 7-19117013-G-GT is Pathogenic according to our data. Variant chr7-19117013-G-GT is described in ClinVar as [Pathogenic]. Clinvar id is 7973.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
TWIST1 | NM_000474.4 | c.308_309insA | p.Tyr103Ter | stop_gained, frameshift_variant | 1/2 | ENST00000242261.6 | NP_000465.1 | |
TWIST1 | NR_149001.2 | n.623_624insA | non_coding_transcript_exon_variant | 1/3 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
TWIST1 | ENST00000242261.6 | c.308_309insA | p.Tyr103Ter | stop_gained, frameshift_variant | 1/2 | 1 | NM_000474.4 | ENSP00000242261 | P1 | |
TWIST1 | ENST00000354571.5 | c.105_106insA | p.Tyr36Ter | stop_gained, frameshift_variant, NMD_transcript_variant | 1/3 | 2 | ENSP00000346582 |
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:2
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Saethre-Chotzen syndrome;C4551902:TWIST1-related craniosynostosis Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Sep 24, 2022 | For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 7973). This premature translational stop signal has been observed in individual(s) with Saethre-Chotzen syndrome (PMID: 8988166). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Tyr103*) in the TWIST1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TWIST1 are known to be pathogenic (PMID: 10749989). - |
Saethre-Chotzen syndrome Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Jan 01, 1997 | - - |
Computational scores
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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