VCV001761050.4 - ClinVar

NM_001267550.2(TTN):c.106108A>G (p.Thr35370Ala)

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.

Uncertain significance

criteria provided, multiple submitters, no conflicts

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_001267550.2(TTN):c.106108A>G (p.Thr35370Ala)

Variation ID: 1761050 Accession: VCV001761050.4

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 2q31.2 2: 178530507 (GRCh38) [ NCBI UCSC ] 2: 179395234 (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	Nov 29, 2022	May 1, 2024	Jan 26, 2022

HGVS

Nucleotide	Protein	Molecular consequence
NM_001267550.2:c.106108A>G MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.	NP_001254479.2:p.Thr35370Ala	missense
NM_001256850.1:c.101185A>G	NP_001243779.1:p.Thr33729Ala	missense
NM_003319.4:c.78913A>G	NP_003310.4:p.Thr26305Ala	missense
NM_133378.4:c.98404A>G	NP_596869.4:p.Thr32802Ala	missense
NM_133432.3:c.79288A>G	NP_597676.3:p.Thr26430Ala	missense
NM_133437.4:c.79489A>G	NP_597681.4:p.Thr26497Ala	missense
NC_000002.12:g.178530507T>C
NC_000002.11:g.179395234T>C
NG_011618.3:g.305296A>G
NG_051363.1:g.12681T>C
LRG_391:g.305296A>G
LRG_391t1:c.106108A>G	LRG_391p1:p.Thr35370Ala

... more HGVS ... less HGVS

Protein change

T26305A, T35370A, T26430A, T26497A, T32802A, T33729A

Other names

Canonical SPDI

NC_000002.12:178530506:T: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.
TTN		Sufficient evidence for dosage pathogenicity	No evidence available	GRCh38 GRCh37	11970	31891
LOC129935182	-	-	-	GRCh38	-	89
TTN-AS1	-	-	-	GRCh38	-	18288

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.
Cardiovascular phenotype	Uncertain significance (1)	criteria provided, single submitter	Sep 24, 2019	RCV002416588.2
Autosomal recessive limb-girdle muscular dystrophy type 2J Dilated cardiomyopathy 1G	Uncertain significance (1)	criteria provided, single submitter	Jan 26, 2022	RCV003103448.2

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.
Uncertain significance (Jan 26, 2022)	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015)) Method: clinical testing	Dilated cardiomyopathy 1G Autosomal recessive limb-girdle muscular dystrophy type 2J Affected status: unknown Allele origin: germline	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV003008614.1 First in ClinVar: Feb 07, 2023 Last updated: Feb 07, 2023	Publications: PubMed (2) PubMed: 25589632‚ 23975875 Comment: This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 35370 of the TTN protein (p.Thr35370Ala). … (more) This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 35370 of the TTN protein (p.Thr35370Ala). This variant is present in population databases (no rsID available, gnomAD 0.002%). This variant has not been reported in the literature in individuals affected with TTN-related conditions. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant is located in the M band of TTN (PMID: 25589632). Variants in this region may be relevant for neuromuscular disorders, but have not been definitively shown to cause cardiomyopathy (PMID: 23975875). 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. (less)
Uncertain significance (Sep 24, 2019)	criteria provided, single submitter (Ambry Variant Classification Scheme 2023) Method: clinical testing	Cardiovascular phenotype Affected status: unknown Allele origin: germline	Ambry Genetics Accession: SCV002676577.2 First in ClinVar: Nov 29, 2022 Last updated: May 01, 2024	Comment: The p.T26305A variant (also known as c.78913A>G), located in coding exon 185 of the TTN gene, results from an A to G substitution at nucleotide … (more) The p.T26305A variant (also known as c.78913A>G), located in coding exon 185 of the TTN gene, results from an A to G substitution at nucleotide position 78913. The threonine at codon 26305 is replaced by alanine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. (less)

Comment:

This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 35370 of the TTN protein (p.Thr35370Ala). This variant is present in population databases (no rsID available, gnomAD 0.002%). This variant has not been reported in the literature in individuals affected with TTN-related conditions. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant is located in the M band of TTN (PMID: 25589632). Variants in this region may be relevant for neuromuscular disorders, but have not been definitively shown to cause cardiomyopathy (PMID: 23975875). 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.

Comment:

The p.T26305A variant (also known as c.78913A>G), located in coding exon 185 of the TTN gene, results from an A to G substitution at nucleotide position 78913. The threonine at codon 26305 is replaced by alanine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

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
Integrated allelic, transcriptional, and phenomic dissection of the cardiac effects of titin truncations in health and disease.	Roberts AM	Science translational medicine	2015	PMID: 25589632
Recessive truncating titin gene, TTN, mutations presenting as centronuclear myopathy.	Ceyhan-Birsoy O	Neurology	2013	PMID: 23975875

Text-mined citations for this variant ...

Record last updated Sep 29, 2024

ClinVar Genomic variation as it relates to human health

NM_001267550.2(TTN):c.106108A>G (p.Thr35370Ala)

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...