rs80356541
Positions:
Variant summary
Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP7
The ENST00000311916.8(TWNK):c.1287C>T(p.Ala429=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 33)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
TWNK
ENST00000311916.8 synonymous
ENST00000311916.8 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: 0.361
Genes affected
TWNK (HGNC:1160): (twinkle mtDNA helicase) This gene encodes a hexameric DNA helicase which unwinds short stretches of double-stranded DNA in the 5' to 3' direction and, along with mitochondrial single-stranded DNA binding protein and mtDNA polymerase gamma, is thought to play a key role in mtDNA replication. The protein localizes to the mitochondrial matrix and mitochondrial nucleoids. Mutations in this gene cause infantile onset spinocerebellar ataxia (IOSCA) and progressive external ophthalmoplegia (PEO) and are also associated with several mitochondrial depletion syndromes. Alternative splicing results in multiple transcript variants encoding distinct isoforms.[provided by RefSeq, Aug 2009]
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ACMG classification
Classification made for transcript
Verdict is Likely_benign. Variant got -1 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.44).
BP7
Synonymous conserved (PhyloP=0.361 with no splicing effect.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
TWNK | NM_021830.5 | c.1287C>T | p.Ala429= | synonymous_variant | 2/5 | ENST00000311916.8 | NP_068602.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
TWNK | ENST00000311916.8 | c.1287C>T | p.Ala429= | synonymous_variant | 2/5 | 1 | NM_021830.5 | ENSP00000309595 | P1 |
Frequencies
GnomAD3 genomes Cov.: 33
GnomAD3 genomes
Cov.:
33
GnomAD4 exome AF: 6.84e-7 AC: 1AN: 1461876Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1AN XY: 727242
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32
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1
AN XY:
727242
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GnomAD4 genome Cov.: 33
GnomAD4 genome
Cov.:
33
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1Other:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Infantile onset spinocerebellar ataxia Uncertain:1Other:1
not provided, no classification provided | literature only | GeneReviews | - | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | 3billion | May 22, 2022 | This variant is absent from the gnomAD v2.1.1 dataset. It has bee previously reported in trans with another pathogenic variant in this gene (PMID: 16135556). Therefore, this variant is classified as uncertain significanceaccording to the recommendation of ACMG/AMP guideline. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
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