Fu D, Wang S, Luo Y, Wu S, Peng D. Identification of a novel splicing-altering LAMP2 variant in a Chinese family with Danon disease.
ESC Heart Fail 2023;
10:2479-2486. [PMID:
37277924 PMCID:
PMC10375081 DOI:
10.1002/ehf2.14417]
[Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 04/18/2023] [Accepted: 05/11/2023] [Indexed: 06/07/2023] Open
Abstract
AIMS
This study aimed to identify a novel splicing-altering LAMP2 variant associated with Danon disease.
METHODS AND RESULTS
To identify the potential genetic mutation in a Chinese pedigree, whole-exome sequencing was conducted in the proband, and Sanger sequencing was performed on the proband's parents. To verify the impact of the splice-site variant, a minigene splicing assay was applied. The AlphaFold2 analysis was used to analyse the mutant protein structure. A splice-site variant (NM_013995.2:c.864+5G>A) located at intron 6 of the LAMP2 gene was identified as a potential pathogenic variant. The minigene splicing revealed that this variant causes exon 6 to be skipped, resulting in a truncated protein. The AlphaFold2 analysis showed that the mutation caused a protein twist direction change, leading to conformational abnormality.
CONCLUSIONS
A novel splice-site variant (NM_013995.2:c.864+5G>A) located at intron 6 of the LAMP2 gene was identified. This discovery may enlarge the LAMP2 variant spectrum, promote accurate genetic counselling, and contribute to the diagnosis of Danon disease.
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