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NM_001267550.2(TTN):c.104390A>C (p.Glu34797Ala) AND multiple conditions

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Jan 6, 2024
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:
RCV002907628.3

Allele description [Variation Report for NM_001267550.2(TTN):c.104390A>C (p.Glu34797Ala)]

NM_001267550.2(TTN):c.104390A>C (p.Glu34797Ala)

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.104390A>C (p.Glu34797Ala)
HGVS:
  • NC_000002.12:g.178532225T>G
  • NG_011618.3:g.303578A>C
  • NG_051363.1:g.14399T>G
  • NM_001256850.1:c.99467A>C
  • NM_001267550.2:c.104390A>CMANE SELECT
  • NM_003319.4:c.77195A>C
  • NM_133378.4:c.96686A>C
  • NM_133432.3:c.77570A>C
  • NM_133437.4:c.77771A>C
  • NP_001243779.1:p.Glu33156Ala
  • NP_001254479.1:p.Glu34797Ala
  • NP_001254479.2:p.Glu34797Ala
  • NP_003310.4:p.Glu25732Ala
  • NP_596869.4:p.Glu32229Ala
  • NP_597676.3:p.Glu25857Ala
  • NP_597681.4:p.Glu25924Ala
  • LRG_391t1:c.104390A>C
  • LRG_391:g.303578A>C
  • LRG_391p1:p.Glu34797Ala
  • NC_000002.11:g.179396952T>G
  • NM_001267550.1:c.104390A>C
Protein change:
E25732A
Molecular consequence:
  • NM_001256850.1:c.99467A>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001267550.2:c.104390A>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_003319.4:c.77195A>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_133378.4:c.96686A>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_133432.3:c.77570A>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_133437.4:c.77771A>C - missense variant - [Sequence Ontology: SO:0001583]

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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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV003244341Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Jan 6, 2024) 		germlineclinical testing

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

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical 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 Labcorp Genetics (formerly Invitae), Labcorp, SCV003244341.2

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (3)

Description

This sequence change replaces glutamic acid, which is acidic and polar, with alanine, which is neutral and non-polar, at codon 34797 of the TTN protein (p.Glu34797Ala). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with TTN-related conditions. ClinVar contains an entry for this variant (Variation ID: 2038466). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Not Available"; Align-GVGD: "Not Available". The alanine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant is located in the M band of TTN (PMID: 25589632). Non-truncating 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.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Sep 29, 2024