rs17113613
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Variant summary
Our verdict is Benign. Variant got -18 ACMG points: 2P and 20B. PM1BP4_StrongBP6_Very_StrongBA1
The NM_021830.5(TWNK):c.1102G>A(p.Val368Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0213 in 1,614,092 control chromosomes in the GnomAD database, including 866 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).
Frequency
Genomes: 𝑓 0.046 ( 346 hom., cov: 33)
Exomes 𝑓: 0.019 ( 520 hom. )
Consequence
TWNK
NM_021830.5 missense
NM_021830.5 missense
Scores
2
15
Clinical Significance
Conservation
PhyloP100: 2.57
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 Benign. Variant got -18 ACMG points.
PM1
In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_021830.5
BP4
Computational evidence support a benign effect (MetaRNN=0.00212875).
BP6
Variant 10-100989312-G-A is Benign according to our data. Variant chr10-100989312-G-A is described in ClinVar as [Benign]. Clinvar id is 136588.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr10-100989312-G-A is described in Lovd as [Benign].
BA1
GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.12 is higher than 0.05.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
|---|---|---|---|---|---|---|---|
| TWNK | NM_021830.5 | c.1102G>A | p.Val368Ile | missense_variant | 1/5 | ENST00000311916.8 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| TWNK | ENST00000311916.8 | c.1102G>A | p.Val368Ile | missense_variant | 1/5 | 1 | NM_021830.5 | P1 |
Frequencies
GnomAD3 genomes 0.0462 AC: 7027AN: 152126Hom.: 341 Cov.: 33
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GnomAD3 exomes AF: 0.0220 AC: 5521AN: 251324Hom.: 172 AF XY: 0.0190 AC XY: 2587AN XY: 135872
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GnomAD4 exome AF: 0.0187 AC: 27363AN: 1461848Hom.: 520 Cov.: 32 AF XY: 0.0177 AC XY: 12875AN XY: 727222
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GnomAD4 genome 0.0463 AC: 7047AN: 152244Hom.: 346 Cov.: 33 AF XY: 0.0458 AC XY: 3411AN XY: 74466
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TwinsUK
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ESP6500AA
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ClinVar
Significance: Benign
Submissions summary: Benign:12
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Benign:4
| Benign, criteria provided, single submitter | clinical testing | Invitae | Jan 30, 2024 | - - |
| Benign, no assertion criteria provided | clinical testing | Mayo Clinic Laboratories, Mayo Clinic | Mar 09, 2016 | - - |
| Benign, criteria provided, single submitter | clinical testing | ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories | Nov 06, 2023 | - - |
| Benign, criteria provided, single submitter | clinical testing | Athena Diagnostics | Jan 30, 2018 | - - |
not specified Benign:3
| Benign, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Dec 05, 2014 | - - |
| Benign, criteria provided, single submitter | clinical testing | GeneDx | Jan 03, 2012 | This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. - |
| Benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | - | - - |
Autosomal recessive cerebellar ataxia Benign:1
| Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Mar 06, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. - |
Sensory ataxic neuropathy, dysarthria, and ophthalmoparesis Benign:1
| Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Mar 06, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. - |
Hereditary spastic paraplegia Benign:1
| Benign, criteria provided, single submitter | clinical testing | Genome Diagnostics Laboratory, The Hospital for Sick Children | Dec 21, 2021 | - - |
Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal dominant 3 Benign:1
| Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Mar 06, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. - |
Infantile onset spinocerebellar ataxia Benign:1
| Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Mar 06, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Benign
T
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
DEOGEN2
Benign
T;.
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
LIST_S2
Benign
D;T
MetaRNN
Benign
T;T
MetaSVM
Benign
T
MutationAssessor
Benign
L;L
MutationTaster
Benign
D;D
PROVEAN
Benign
N;N
REVEL
Uncertain
Sift
Benign
T;T
Sift4G
Benign
T;T
Polyphen
P;B
Vest4
MPC
ClinPred
T
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
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