7-19117045-TGCCGCCGCCGCCGCCCGCGCCGCC-TGCCGCCGCCGCCGCCCGCGCCGCCGCCGCCGCCCGCGCCGCC
Variant summary
Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM1BS2
The NM_000474.4(TWIST1):c.259_276dupGCGGGCGGCGGCGGCGGC(p.Gly92_Ser93insAlaGlyGlyGlyGlyGly) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000119 in 150,740 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: 𝑓 0.00012 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000087 ( 0 hom. )
Failed GnomAD Quality Control
Consequence
TWIST1
NM_000474.4 conservative_inframe_insertion
NM_000474.4 conservative_inframe_insertion
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 0.251
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 Likely_benign. Variant got -2 ACMG points.
PM1
In a chain Twist-related protein 1 (size 201) in uniprot entity TWST1_HUMAN there are 17 pathogenic changes around while only 3 benign (85%) in NM_000474.4
BS2
High AC in GnomAd4 at 18 AD gene.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
TWIST1 | NM_000474.4 | c.259_276dupGCGGGCGGCGGCGGCGGC | p.Gly92_Ser93insAlaGlyGlyGlyGlyGly | conservative_inframe_insertion | 1/2 | ENST00000242261.6 | NP_000465.1 | |
TWIST1 | NR_149001.2 | n.574_591dupGCGGGCGGCGGCGGCGGC | non_coding_transcript_exon_variant | 1/3 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
TWIST1 | ENST00000242261.6 | c.259_276dupGCGGGCGGCGGCGGCGGC | p.Gly92_Ser93insAlaGlyGlyGlyGlyGly | conservative_inframe_insertion | 1/2 | 1 | NM_000474.4 | ENSP00000242261.5 | ||
TWIST1 | ENST00000354571.5 | n.55_72dupGCGGGCGGCGGCGGCGGC | non_coding_transcript_exon_variant | 1/3 | 2 | ENSP00000346582.5 |
Frequencies
GnomAD3 genomes AF: 0.000119 AC: 18AN: 150740Hom.: 0 Cov.: 32
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GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.0000866 AC: 112AN: 1292786Hom.: 0 Cov.: 31 AF XY: 0.0000832 AC XY: 53AN XY: 636938
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GnomAD4 genome AF: 0.000119 AC: 18AN: 150740Hom.: 0 Cov.: 32 AF XY: 0.000163 AC XY: 12AN XY: 73528
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Saethre-Chotzen syndrome;C4551902:TWIST1-related craniosynostosis Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Oct 07, 2024 | This variant, c.259_276dup, results in the insertion of 6 amino acid(s) of the TWIST1 protein (p.Ala87_Gly92dup), but otherwise preserves the integrity of the reading frame. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TWIST1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1971612). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. - |
Computational scores
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Find out detailed SpliceAI scores and Pangolin per-transcript scores at