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22.03.2020 | Original article

Functional analysis of suspected splicing variants in CLCN5 gene in Dent disease 1

Zeitschrift:
Clinical and Experimental Nephrology
Autoren:
Tomohiko Inoue, China Nagano, Masafumi Matsuo, Tomohiko Yamamura, Nana Sakakibara, Tomoko Horinouchi, Yugo Shibagaki, Daisuke Ichikawa, Yuya Aoto, Shinya Ishiko, Shingo Ishimori, Rini Rossanti, Kazumoto Iijima, Kandai Nozu
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s10157-020-01876-x) contains supplementary material, which is available to authorized users.

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Abstract

Background

In recent years, the elucidation of splicing abnormalities as a cause of hereditary diseases has progressed. However, there are no comprehensive reports of suspected splicing variants in the CLCN5 gene in Dent disease cases. We reproduced gene mutations by mutagenesis, inserted the mutated genes into minigene vectors, and investigated the pathogenicity and onset mechanisms of these variants.

Methods

We conducted functional splicing assays using a hybrid minigene for six suspected splicing variants (c.105G>A, c.105+5G>C, c.106−17T>G, c.393+4A>G, c.517−8A>G, c.517−3C>A) in CLCN5. We extracted information on these variants from the Human Gene Mutation Database. We reproduced minigene vectors with the insertion of relevant exons with suspected splicing variants. We then transfected these minigene vectors into cultured cells and extracted and analyzed the mRNA. In addition, we conducted in silico analysis to confirm our minigene assay results.

Results

We successfully determined that five of these six variants are pathogenic via the production of splicing abnormalities. One showed only normal transcript production and was thus suspected of not being pathogenic (c.106−17T>G).

Conclusion

We found that five CLCN5 variants disrupted the original splice site, resulting in aberrant splicing. It is sometimes difficult to obtain mRNA from patient samples because of the fragility of mRNA or its low expression level in peripheral leukocytes. Our in vitro system can be used as an alternative to in vivo assays to determine the pathogenicity of suspected splicing variants.

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