NM_001267550.2(TTN):c.89017C>T (p.Arg29673Ter) AND multiple conditions

Germline classification:: Likely pathogenic (1 submission)
Last evaluated:: Dec 2, 2022
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000795050.7

Allele description [Variation Report for NM_001267550.2(TTN):c.89017C>T (p.Arg29673Ter)]

NM_001267550.2(TTN):c.89017C>T (p.Arg29673Ter)

Genes:

TTN-AS1:TTN antisense RNA 1 [Gene - HGNC]
TTN:titin [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

2q31.2

Genomic location:

Preferred name:

NM_001267550.2(TTN):c.89017C>T (p.Arg29673Ter)

HGVS:

NC_000002.12:g.178554094G>A
NG_011618.3:g.281709C>T
NG_051363.1:g.36268G>A
NM_001256850.1:c.84094C>T
NM_001267550.2:c.89017C>TMANE SELECT
NM_003319.4:c.61822C>T
NM_133378.4:c.81313C>T
NM_133432.3:c.62197C>T
NM_133437.4:c.62398C>T
NP_001243779.1:p.Arg28032Ter
NP_001254479.2:p.Arg29673Ter
NP_003310.4:p.Arg20608Ter
NP_596869.4:p.Arg27105Ter
NP_597676.3:p.Arg20733Ter
NP_597681.4:p.Arg20800Ter
LRG_391:g.281709C>T
NC_000002.11:g.179418821G>A

Protein change:

R20608*

Links:

dbSNP: rs886038916

NCBI 1000 Genomes Browser:

rs886038916

Molecular consequence:

NM_001256850.1:c.84094C>T - nonsense - [Sequence Ontology: SO:0001587]
NM_001267550.2:c.89017C>T - nonsense - [Sequence Ontology: SO:0001587]
NM_003319.4:c.61822C>T - nonsense - [Sequence Ontology: SO:0001587]
NM_133378.4:c.81313C>T - nonsense - [Sequence Ontology: SO:0001587]
NM_133432.3:c.62197C>T - nonsense - [Sequence Ontology: SO:0001587]
NM_133437.4:c.62398C>T - nonsense - [Sequence Ontology: SO:0001587]

Condition(s)

Name:: Dilated cardiomyopathy 1G (CMD1G)
Identifiers:: MONDO: MONDO:0011400; MedGen: C1858763; Orphanet: 154; OMIM: 604145

Name:: Autosomal recessive limb-girdle muscular dystrophy type 2J (LGMDR10)
Synonyms:: Limb-girdle muscular dystrophy, type 2J; MUSCULAR DYSTROPHY, LIMB-GIRDLE, AUTOSOMAL RECESSIVE 10
Identifiers:: MONDO: MONDO:0012127; MedGen: C1837342; Orphanet: 140922; OMIM: 608807

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000934491	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Likely pathogenic (Dec 2, 2022)	germline	clinical testing	PubMed (3) [See all records that cite these PMIDs] 25589632, 23975875, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000934491

Invitae

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Likely pathogenic
(Dec 2, 2022)

germline

clinical testing

PubMed (3)
[See all records that cite these PMIDs]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Integrated allelic, transcriptional, and phenomic dissection of the cardiac effects of titin truncations in health and disease.

Roberts AM, Ware JS, Herman DS, Schafer S, Baksi J, Bick AG, Buchan RJ, Walsh R, John S, Wilkinson S, Mazzarotto F, Felkin LE, Gong S, MacArthur JA, Cunningham F, Flannick J, Gabriel SB, Altshuler DM, Macdonald PS, Heinig M, Keogh AM, Hayward CS, et al.

Sci Transl Med. 2015 Jan 14;7(270):270ra6. doi: 10.1126/scitranslmed.3010134.

PubMed [citation]

PMID:: 25589632
PMCID:: PMC4560092

Recessive truncating titin gene, TTN, mutations presenting as centronuclear myopathy.

Ceyhan-Birsoy O, Agrawal PB, Hidalgo C, Schmitz-Abe K, DeChene ET, Swanson LC, Soemedi R, Vasli N, Iannaccone ST, Shieh PB, Shur N, Dennison JM, Lawlor MW, Laporte J, Markianos K, Fairbrother WG, Granzier H, Beggs AH.

Neurology. 2013 Oct 1;81(14):1205-14. doi: 10.1212/WNL.0b013e3182a6ca62. Epub 2013 Aug 23.

PubMed [citation]

PMID:: 23975875
PMCID:: PMC3795603

See all PubMed Citations (3)

Details of each submission

From Invitae, SCV000934491.6

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (3)

Description

This variant is located in the A band of TTN (PMID: 25589632). Truncating variants in this region are significantly overrepresented in patients affected with dilated cardiomyopathy (PMID: 25589632). Truncating variants in this region have also been reported in individuals affected with autosomal recessive centronuclear myopathy (PMID: 23975875). 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. ClinVar contains an entry for this variant (Variation ID: 263764). This variant has not been reported in the literature in individuals affected with TTN-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg29673*) in the TTN gene. While this is not anticipated to result in nonsense mediated decay, it is expected to create a truncated TTN protein.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Mar 5, 2024

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