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Inborn Errors of Metabolism01:20

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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Distinctive metabolic remodeling in TYMP deficiency beyond mitochondrial dysfunction.

Jixiang Du1, Chao Zhang2, Fuchen Liu1

  • 1Department of Neurology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, 250012, China.

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|August 21, 2023
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Summary
This summary is machine-generated.

Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE), caused by thymidine phosphorylase (TYMP) deficiency, disrupts nucleoside, cholesterol, and fatty acid metabolism beyond mitochondrial dysfunction. This highlights broader biochemical impacts and potential diagnostic biomarkers.

Keywords:
Cholesterol metabolismFatty acid metabolismMNGIEMetabolomicsTYMP

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Area of Science:

  • Biochemistry
  • Genetics
  • Metabolomics

Background:

  • Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a genetic disorder linked to thymidine phosphorylase (TP) deficiency.
  • TP is a cytosolic enzyme, suggesting its role extends beyond mitochondrial DNA replication.
  • Understanding the full metabolic impact of TYMP deficiency is crucial for MNGIE.

Purpose of the Study:

  • To identify metabolic alterations and regulatory mechanisms in TYMP deficiency.
  • To evaluate the pathogenicity of novel TYMP variants.
  • To compare metabolic profiles of MNGIE patients with MELAS patients and healthy controls.

Main Methods:

  • Analysis of plasma samples from MNGIE patients, MELAS patients, and healthy controls using metabolomics.
  • Transcriptomics and bioenergetic studies on skin fibroblasts.
  • TYMP overexpression experiments to assess functional rescue.

Main Results:

  • MNGIE patients exhibited distinct alterations in plasma nucleosides, bile acids, and steroid metabolites.
  • Fibroblasts from TYMP-deficient patients showed mitochondrial dysfunction, similar to MELAS patients.
  • TYMP deficiency led to reduced cholesterol and fatty acid metabolism, linked to SREBP pathways.

Conclusions:

  • TYMP deficiency causes widespread metabolic disturbances, including nucleoside, cholesterol, and fatty acid metabolism.
  • Mitochondrial dysfunction is present but not the sole consequence of TYMP deficiency.
  • Metabolite biomarkers may aid in MNGIE diagnosis.