• Janis Stavusis, Ieva Micule, Ieva Grinfelde, Anna Zdanovica, Janis Pudulis, Sandra Valeina, Svetlana Sepetiene, Baiba Lace, and Inna Inashkina.
• Latvian Biomedical Research and Study Centre, Ratsupites 1, LV-1067 Riga, Latvia.
• Medicina (Kaunas). 2024 Jan 5; 60 (1).

AbstractBackground and Objectives: Danon disease is a multisystemic disorder associated with variants in the LAMP2 gene, mainly affecting the cardiac muscle. Here, we report a multigenerational family from Latvia with two male patients, hemizygous for a novel splice-affecting variant c.928+3A>G. Affected patients exhibit a cardiac phenotype, moderate mental disability, and mild retinal changes. Materials and Methods: Both patients underwent either exome or hypertrophic cardiomyopathy gene panel next-generation sequencing. The pathogenic variant effect was determined using reverse transcription, Sanger sequencing, and high-resolution electrophoresis. Results: Evaluation of the splicing process revealed that approximately 80% of the transcripts exhibited a lack of the entire exon 7. This alteration was predicted to cause a shift of the reading frame, consequently introducing a premature stop codon downstream in the sequence. Conclusions: Based on our data, we propose that c.928+3A>G is a pathogenic variant associated with Danon disease.

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