ClinVar Miner

Submissions for variant NM_000371.4(TTR):c.68C>T (p.Thr23Met)

gnomAD frequency: 0.00001  dbSNP: rs377052919
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Total submissions: 4
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine RCV000036378 SCV000060033 uncertain significance not specified 2012-07-31 criteria provided, single submitter clinical testing Variant classified as Uncertain Significance - Favor Benign. The Thr23Met varian t in TTR has not been reported in the literature nor previously identified by ou r laboratory. Threonine (Thr) at position 23 is not conserved in evolution, sugg esting that a change at this position may be tolerated. Computational analyses ( biochemical amino acid properties, AlignGVGD, PolyPhen2, and SIFT) also suggest that this variant may not impact the protein. This variant is located in the las t three bases of the exon, which is part of the 5' splice region, but computatio nal tools do not predict altered splicing (the accuracy of these tools is unknow n). The lack of amino acid conservation suggests that the Tyr535His variant may be benign, but additional studies are needed to establish this with confidence.
GeneDx RCV001719730 SCV000209361 uncertain significance not provided 2019-12-17 criteria provided, single submitter clinical testing Has not been previously published in association with TTR-related disorders to our knowledge; Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 663602; Landrum et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 30683924)
Invitae RCV001071114 SCV001236401 uncertain significance Amyloidogenic transthyretin amyloidosis 2023-12-11 criteria provided, single submitter clinical testing This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 23 of the TTR protein (p.Thr23Met). This variant is present in population databases (rs377052919, gnomAD 0.007%). This variant has not been reported in the literature in individuals affected with TTR-related conditions. ClinVar contains an entry for this variant (Variation ID: 43456). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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.
Fulgent Genetics, Fulgent Genetics RCV002482975 SCV002790378 uncertain significance Hyperthyroxinemia, dystransthyretinemic; Amyloidogenic transthyretin amyloidosis; Carpal tunnel syndrome 1 2021-09-02 criteria provided, single submitter clinical testing

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