ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.66452G>A (p.Arg22151Gln)

gnomAD frequency: 0.00001  dbSNP: rs781750042
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Labcorp Genetics (formerly Invitae), Labcorp RCV000642761 SCV000764448 uncertain significance Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2024-04-05 criteria provided, single submitter clinical testing This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 22151 of the TTN protein (p.Arg22151Gln). 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: 535007). 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 glutamine 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 A band of TTN (PMID: 25589632). Variants in this region may be relevant for cardiac or neuromuscular disorders (PMID: 25589632, 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.
CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario RCV000768954 SCV000900327 uncertain significance Cardiomyopathy 2015-12-18 criteria provided, single submitter clinical testing
PreventionGenetics, part of Exact Sciences RCV004544857 SCV004799896 uncertain significance TTN-related disorder 2024-01-12 no assertion criteria provided clinical testing The TTN c.66452G>A variant is predicted to result in the amino acid substitution p.Arg22151Gln. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.00089% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence.

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