DSG2 Variant Linked to Severe Cardiomyopathy Cases
Author Information
Author(s): Takuya Sumida, Shou Ogawa, Higo Shuichiro, Kuramoto Yuki, Eto Ryo, Ikeda Yoshihiko, Sun Congcong, Li Junjun, Liu Li, Tabata Tomoka, Asano Yoshihiro, Shiba Mikio, Akazawa Yasuhiro, Nakamura Daisuke, Oka Takafumi, Ohtani Tomohito, Sakata Yasushi
Primary Institution: Osaka University
Hypothesis
The pathological significance and prevalence of the heterozygous DSG2 p.Arg119Ter variant in cardiomyopathy patients remains uncertain.
Conclusion
The DSG2 p.Arg119Ter variant is more common in East Asian populations and may worsen heart conditions when combined with other genetic or environmental factors.
Supporting Evidence
- Four unrelated patients with cardiomyopathy were identified with the heterozygous DSG2 p.Arg119Ter variant.
- The allele frequency of the DSG2 p.Arg119Ter variant was found to be 0.0037 among the studied patients.
- Immunohistochemical analysis revealed reduced expression of desmoglein-2 and desmoplakin in myocardial samples.
- Transmission electron microscopy showed abnormal desmosomes and gaps in intercalated discs in the myocardium.
- Microforce tests indicated reduced contractility in cardiomyocytes carrying the heterozygous DSG2 variant.
Takeaway
This study found a gene variant that can cause serious heart problems in some patients, showing that it might be more common in certain populations.
Methodology
The study involved genetic analysis of 808 patients with nonischemic cardiomyopathy, identifying variants through whole-exome sequencing and immunohistochemical analysis.
Limitations
The study cannot exclude the possibility of noncoding intronic and intergenic variants that may be associated with known cardiomyopathy-causing genetic variants.
Participant Demographics
The study included four unrelated patients with cardiomyopathy and a total of 808 patients analyzed.
Statistical Information
P-Value
0.0037
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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