New Insights into the Pathophysiology of Methylmalonic Acidemia

Overview

Journal J Inherit Metab Dis

Publisher Wiley

Date 2023 Apr 20

PMID 37078237

Authors

PamelaSara E Head

Jordan L Meier

Charles P Venditti

Affiliations

Soon will be listed here.

Abstract

Methylmalonic acidemia (MMA) is a severe inborn error of metabolism that is characterized by pleiotropic metabolic perturbations and multiorgan pathology. Treatment options are limited and non-curative as the underlying causative molecular mechanisms remain unknown. While earlier studies have focused on the potential direct toxicity of metabolites such as methylmalonic and propionic acid as a mechanism to explain disease pathophysiology, new observations have revealed that aberrant acylation, specifically methylmalonylation, is a characteristic feature of MMA. The mitochondrial sirtuin enzyme SIRT5 is capable of recognizing and removing this PTM, however, reduced protein levels of SIRT5 along with other mitochondrial SIRTs 3 and 4 in MMA and potentially reduced function of all three indicates aberrant acylation may require clinical intervention. Therefore, targeting posttranslational modifications may represent a new therapeutic approach to treat MMA and related organic acidemias.

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