Muscle involvement in Dent disease 2.

Area of Science:

• Nephrology
• Genetics
• Biochemistry

Background:

• Dent disease is an X-linked renal tubulopathy caused by CLCN5 or OCRL mutations.
• OCRL mutations are also linked to Lowe syndrome.
• Clinical differentiation between Dent disease types can be challenging without genetic testing.

Purpose of the Study:

• To validate findings on serum muscle enzyme differences between Dent disease types.
• To assess the utility of muscle enzyme levels as biomarkers for genotype prediction.

Main Methods:

• Serum levels of creatine phosphokinase (CPK), lactate dehydrogenase (LDH), and aspartate aminotransferase (AST) were measured.
• Alanine aminotransferase (ALT) was measured as a control.
• Patients were categorized into Dent disease 1 (n=23), Dent disease 2 (n=5), and Lowe syndrome (n=19) groups.

Main Results:

• Elevated serum levels of CPK, LDH, and AST were observed in Dent disease 2 and Lowe syndrome groups compared to Dent disease 1.
• One patient in the Dent disease 2 group exhibited muscle hypoplasia.
• Serum ALT levels remained normal across all groups, indicating specificity of muscle enzyme changes.

Conclusions:

• Serum muscle enzyme levels serve as reliable biomarkers for predicting genotypes in Dent disease.
• These enzyme levels can indicate underlying genetic conditions even in the absence of clinical muscle involvement.