ClinVar Miner

Submissions for variant NM_005592.4(MUSK):c.1360G>A (p.Asp454Asn)

gnomAD frequency: 0.00001  dbSNP: rs202239254
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV000653226 SCV000775102 uncertain significance Fetal akinesia deformation sequence 1; Congenital myasthenic syndrome 9 2022-07-06 criteria provided, single submitter clinical testing This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 454 of the MUSK protein (p.Asp454Asn). This variant also falls at the last nucleotide of exon 10, which is part of the consensus splice site for this exon. This variant is present in population databases (rs202239254, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with MUSK-related conditions. ClinVar contains an entry for this variant (Variation ID: 542742). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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.
PreventionGenetics, part of Exact Sciences RCV004533424 SCV004107205 uncertain significance MUSK-related disorder 2023-02-09 criteria provided, single submitter clinical testing The MUSK c.1360G>A variant is predicted to result in the amino acid substitution p.Asp454Asn. This variant occurs at the last nucleotide position of exon 10 and is predicted to impact splicing based on available splicing prediction programs (Alamut Visual Plus v1.6.1). However, the use of computer prediction programs is not equivalent to functional evidence. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.010% of alleles in individuals of Ashkenazi Jewish descent in gnomAD (http://gnomad.broadinstitute.org/variant/9-113538243-G-A). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence.
GenomeConnect - Invitae Patient Insights Network RCV000653226 SCV004037555 not provided Fetal akinesia deformation sequence 1; Congenital myasthenic syndrome 9 no assertion provided phenotyping only Variant classified as Uncertain significance and reported on 12-04-2017 by Invitae. GenomeConnect-Invitae Patient Insights Network assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. Registry team members make no attempt to reinterpret the clinical significance of the variant. Phenotypic details are available under supporting information.

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