Elevated glutaric acid levels in Dhtkd1-/Gcdh- double knockout mice challenge our current understanding of lysine metabolism

Glutaric aciduria type I (GA-I) is a rare organic aciduria caused by the autosomal recessive inherited deficiency of glutaryl-CoA dehydrogenase (GCDH). GCDH deficiency leads to disruption of l-lysine degradation with characteristic accumulation of glutarylcarnitine and neurotoxic glutaric acid (GA),...

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Hauptverfasser: Biagosch, Caroline (VerfasserIn) , Kölker, Stefan (VerfasserIn) , Sauer, Sven (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2017
In: Biochimica et biophysica acta. Molecular basis of disease
Year: 2017, Jahrgang: 1863, Heft: 9, Pages: 2220-2228
ISSN:1879-260X
DOI:10.1016/j.bbadis.2017.05.018
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1016/j.bbadis.2017.05.018
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0925443917301552
Volltext
Verfasserangaben:Caroline Biagosch, Raga Deepthi Ediga, Svenja-Viola Hensler, Michael Faerberboeck, Ralf Kuehn, Wolfgang Wurst, Thomas Meitinger, Stefan Kölker, Sven Sauer, Holger Prokisch

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520 |a Glutaric aciduria type I (GA-I) is a rare organic aciduria caused by the autosomal recessive inherited deficiency of glutaryl-CoA dehydrogenase (GCDH). GCDH deficiency leads to disruption of l-lysine degradation with characteristic accumulation of glutarylcarnitine and neurotoxic glutaric acid (GA), glutaryl-CoA, 3-hydroxyglutaric acid (3-OHGA). DHTKD1 acts upstream of GCDH, and its deficiency leads to none or often mild clinical phenotype in humans, 2-aminoadipic 2-oxoadipic aciduria. We hypothesized that inhibition of DHTKD1 may prevent the accumulation of neurotoxic dicarboxylic metabolites suggesting DHTKD1 inhibition as a possible treatment strategy for GA-I. In order to validate this hypothesis we took advantage of an existing GA-I (Gcdh−/−) mouse model and established a Dhtkd1 deficient mouse model. Both models reproduced the biochemical and clinical phenotype observed in patients. Under challenging conditions of a high lysine diet, only Gcdh−/− mice but not Dhtkd1−/− mice developed clinical symptoms such as lethargic behaviour and weight loss. However, the genetic Dhtkd1 inhibition in Dhtkd1−/−/Gcdh−/− mice could not rescue the GA-I phenotype. Biochemical results confirm this finding with double knockout mice showing similar metabolite accumulations as Gcdh−/− mice with high GA in brain and liver. This suggests that DHTKD1 inhibition alone is not sufficient to treat GA-I, but instead a more complex strategy is needed. Our data highlights the many unresolved questions within the l-lysine degradation pathway and provides evidence for a so far unknown mechanism leading to glutaryl-CoA. 
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