rs111033573
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong
The NM_021830.5(TWNK):c.1075G>A(p.Ala359Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,860 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A359V) has been classified as Likely pathogenic.
Frequency
Consequence
NM_021830.5 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 18 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TWNK | NM_021830.5 | c.1075G>A | p.Ala359Thr | missense_variant | 1/5 | ENST00000311916.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TWNK | ENST00000311916.8 | c.1075G>A | p.Ala359Thr | missense_variant | 1/5 | 1 | NM_021830.5 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461860Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2AN XY: 727230
GnomAD4 genome ? Cov.: 33
ClinVar
Submissions by phenotype
Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal dominant 3 Pathogenic:3
Pathogenic, no assertion criteria provided | literature only | OMIM | Sep 24, 2010 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Suma Genomics | - | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | 3billion | Jan 03, 2022 | Same nucleotide change resulting in same amino acid change has been previously reported to be associated with TWNK related disorder (ClinVar ID: VCV000004618, PMID:11431692, PS1_P). The variant is located in a well-established functional domain or exonic hotspot, where pathogenic variants have frequently reported (PM1_M). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.806, 3CNET: 0.904, PP3_P). A missense variant is a common mechanism associated with Progressive external ophthalmoplegia with mitochondrial DNA deletions (PP2_P). It is not observed in the gnomAD v2.1.1 dataset (PM2_M). Therefore, this variant is classified as likely pathogenic according to the recommendation of ACMG/AMP guideline. - |
Mitochondrial disease Pathogenic:1
Pathogenic, no assertion criteria provided | clinical testing | Wellcome Centre for Mitochondrial Research, Newcastle University | Apr 07, 2017 | - - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 10, 2023 | This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 359 of the TWNK protein (p.Ala359Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant progressive external ophthalmoplegia (PMID: 11431692, 24076137). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 4618). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt TWNK protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects TWNK function (PMID: 20659899). This variant disrupts the p.Ala359 amino acid residue in TWNK. Other variant(s) that disrupt this residue have been determined to be pathogenic (Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at