VCV002443079.2 - ClinVar

NM_016360.4(TACO1):c.280+1G>C

Germline

Classification

The aggregate germline classification for this variant, typically for a monogenic or Mendelian disorder as in the ACMG/AMP guidelines, or for response to a drug. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the aggregate classification.

(2)

Stars represent the aggregate review status, or the level of review supporting the aggregate germline classification for this VCV record. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status. The number of submissions which contribute to this review status is shown in parentheses.

Pathogenic/Likely pathogenic

criteria provided, multiple submitters, no conflicts

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_016360.4(TACO1):c.280+1G>C

Variation ID: 2443079 Accession: VCV002443079.2

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 17q23.3 17: 63601364 (GRCh38) [ NCBI UCSC ] 17: 61678723 (GRCh37) [ NCBI UCSC ]

Timeline in ClinVar

	First in ClinVar Help The date this variant first appeared in ClinVar with each type of classification.	Last submission Help The date of the most recent submission for each type of classification for this variant.	Last evaluated Help The most recent date that a submitter evaluated this variant for each type of classification.
Germline	Mar 11, 2023	Feb 14, 2024	Jan 9, 2024

HGVS

Nucleotide	Protein	Molecular consequence
NM_016360.4:c.280+1G>C MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.		splice donor
NC_000017.11:g.63601364G>C
NC_000017.10:g.61678723G>C
NG_016979.2:g.5471G>C

Protein change

Other names

Canonical SPDI

NC_000017.11:63601363:G:C

Functional consequence Help The effect of the variant on RNA or protein function, based on experimental evidence from submitters.

Global minor allele frequency (GMAF) Help The global minor allele frequency calculated by the 1000 Genomes Project. The minor allele at this location is indicated in parentheses and may be different from the allele represented by this VCV record.

Allele frequency Help The frequency of the allele represented by this VCV record.

Links

VarSome

Genes

Gene	OMIM	ClinGen Gene Dosage Sensitivity Curation		Variation Viewer Help Links to Variation Viewer, a genome browser to view variation data from NCBI databases.	Related variants
Gene	OMIM	HI score Help The haploinsufficiency score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.	TS score Help The triplosensitivity score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.		Within gene Help The number of variants in ClinVar that are contained within this gene, with a link to view the list of variants.	All Help The number of variants in ClinVar for this gene, including smaller variants within the gene and larger CNVs that overlap or fully contain the gene.
TACO1		-	-	GRCh38 GRCh37	118	128

Conditions - Germline

Condition Help The condition for this variant-condition (RCV) record in ClinVar.	Classification Help The aggregate germline classification for this variant-condition (RCV) record in ClinVar. The number of submissions that contribute to this aggregate classification is shown in parentheses. (# of submissions)	Review status Help The aggregate review status for this variant-condition (RCV) record in ClinVar. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status.	Last evaluated Help The most recent date that a submitter evaluated this variant for the condition.	Variation/condition record Help The RCV accession number, with most recent version number, for the variant-condition record, with a link to the RCV web page.
Mitochondrial complex 4 deficiency, nuclear type 8	Pathogenic (1)	criteria provided, single submitter	Feb 23, 2023	RCV003150924.1
not provided	Likely pathogenic (1)	criteria provided, single submitter	Jan 9, 2024	RCV003548991.2

Submissions - Germline

Classification Help The submitted germline classification for each SCV record. (Last evaluated)	Review status Help Stars represent the review status, or the level of review supporting the submitted (SCV) record. This value is calculated by NCBI based on data from the submitter. Read our rules for calculating the review status. This column also includes a link to the submitter’s assertion criteria if provided, and the collection method. (Assertion criteria)	Condition Help The condition for the classification, provided by the submitter for this submitted (SCV) record. This column also includes the affected status and allele origin of individuals observed with this variant.	Submitter Help The submitting organization for this submitted (SCV) record. This column also includes the SCV accession and version number, the date this SCV first appeared in ClinVar, and the date that this SCV was last updated in ClinVar.	More information Help This column includes more information supporting the classification, including citations, the comment on classification, and detailed evidence provided as observations of the variant by the submitter.
Pathogenic (Feb 23, 2023)	criteria provided, single submitter (ACMG Guidelines, 2015) Method: clinical testing	Mitochondrial complex 4 deficiency, nuclear type 8 (Autosomal recessive inheritance) Affected status: yes Allele origin: inherited	Institute for Human Genetics and Genomic Medicine, Uniklinik RWTH Aachen Accession: SCV003838975.1 First in ClinVar: Mar 11, 2023 Last updated: Mar 11, 2023	Comment: The variant is not listed in control collectives (gnomAD) (as of February 23, 2023). To our knowledge, it has not yet been described in the … (more) The variant is not listed in control collectives (gnomAD) (as of February 23, 2023). To our knowledge, it has not yet been described in the literature (as of February 23, 2023). It affects the canonical splice site and thus most likely leads to altered splicing and consequently to the loss of function of the corresponding protein. (Splice AI). Bioinformatically, the change is classified as disease-causing (CADDphred 35). According to the current state of knowledge, the variant can be classified as a "pathogenic variant" (ACMG criteria). (less) Sex: female
Likely pathogenic (Jan 09, 2024)	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015)) Method: clinical testing	not provided Affected status: unknown Allele origin: germline	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV004263527.1 First in ClinVar: Feb 14, 2024 Last updated: Feb 14, 2024	Publications: PubMed (3) PubMed: 16199547‚ 19503089‚ 25044680 Comment: This sequence change affects a donor splice site in intron 1 of the TACO1 gene. It is expected to disrupt RNA splicing. Variants that disrupt … (more) This sequence change affects a donor splice site in intron 1 of the TACO1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in TACO1 are known to be pathogenic (PMID: 19503089, 25044680). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TACO1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2443079). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. (less)

Comment:

The variant is not listed in control collectives (gnomAD) (as of February 23, 2023). To our knowledge, it has not yet been described in the literature (as of February 23, 2023). It affects the canonical splice site and thus most likely leads to altered splicing and consequently to the loss of function of the corresponding protein. (Splice AI). Bioinformatically, the change is classified as disease-causing (CADDphred 35). According to the current state of knowledge, the variant can be classified as a "pathogenic variant" (ACMG criteria).

Comment:

This sequence change affects a donor splice site in intron 1 of the TACO1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in TACO1 are known to be pathogenic (PMID: 19503089, 25044680). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TACO1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2443079). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic.

Germline Functional Evidence

There is no functional evidence in ClinVar for this variation. If you have generated functional data for this variation, please consider submitting that data to ClinVar.

Comment:

Citations for germline classification of this variant

Title	Author	Journal	Year	Link
Diagnostic exome sequencing to elucidate the genetic basis of likely recessive disorders in consanguineous families.	Makrythanasis P	Human mutation	2014	PMID: 25044680
Mutation in TACO1, encoding a translational activator of COX I, results in cytochrome c oxidase deficiency and late-onset Leigh syndrome.	Weraarpachai W	Nature genetics	2009	PMID: 19503089
Splicing in action: assessing disease causing sequence changes.	Baralle D	Journal of medical genetics	2005	PMID: 16199547

Text-mined citations for this variant ...

Record last updated Sep 30, 2024

ClinVar Genomic variation as it relates to human health

NM_016360.4(TACO1):c.280+1G>C

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...