Mitochondrial protease Afg3l2 regulates the homeostasis of mouse hematopoietic stem and progenitor cells through Mmadhc [RNA-Seq]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE295143 | GEO | 2025/12/15
REPOSITORIES: GEO
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Project description:In order to study how mitochondrial proteases function on mouse hematopoietic stem cells, the article constructed Afg3l2 knockout mice. When Afg3l2 was knocked out, mouse hematopoietic stem cells showed HSC depletion accompanied by amino acid accumulation and TCA overactivation. We performed transcriptome and proteome sequencing analysis on cells from wild-type (WT) and Afg3l2-KO mice, and differential gene analysis revealed the Mmadhc protein. Further verification showed that Mmadhc is a substrate of the mitochondrial protease Afg3l2, and overexpression of Mmadhc can mimic the amino acid accumulation and TCA overactivation caused by Afg3l2 knockout. Overall, the mitochondrial protease Afg3l2 affects the homeostasis of hematopoietic stem cells by regulating the level of Mmadhc.
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Project description:New antimalarial drugs are urgently needed to control drug resistant forms of the malaria parasite, Plasmodium falciparum. Although mitochondrial metabolism is the target of both existing drugs and new lead compounds, the role of the mitochondrial tricarboxylic acid (TCA) cycle remains poorly understood. Herein, we describe 11 genetic knockout parasite lines that delete six of the eight TCA cycle enzymes. Although all TCA knockouts grew normally in asexual blood stages, these metabolic deficiencies halted lifecycle progression in later stages. Specifically, aconitase knockout parasites arrested as late gametocytes, whereas α-ketoglutarate dehydrogenase deficient parasites failed to develop oocysts in the mosquitoes. Mass-spectrometry analysis of 13C isotope-labeled TCA mutant parasites showed that P. falciparum has significant flexibility in TCA metabolism. This flexibility manifested itself through changes in pathway fluxes and through altered exchange of substrates between cytosolic and mitochondrial pools. Our findings suggest that mitochondrial metabolic plasticity is essential for parasite development .
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Project description:Analysis of wildtype C. elegans (N2) and pcca-1(ok2282) and metr-1(ok521) mutants fed Comamonas DA1877 Expression profiles are tailored according to dietary input. However, the networks that control dietary responses remain largely uncharacterized. Here, we combine forward and reverse genetic screens to delineate a network of 184 genes that affect the C. elegans dietary response to Comamonas DA1877 bacteria. We find that perturbation of a mitochondrial network comprised of enzymes involved in amino acid metabolism and the TCA cycle affects the dietary response. In humans, mutations in the corresponding genes cause inborn diseases of amino acid metabolism, most of which are treated by dietary intervention. We identify several TFs that mediate the changes in gene expression upon metabolic network perturbations. Altogether, our findings unveil a transcriptional response system that is poised to sense dietary cues and metabolic imbalances, illustrating extensive communication between metabolic networks in the mitochondria and gene regulatory networks in the nucleus. Expression profiles are tailored according to dietary input. However, the networks that control dietary responses remain largely uncharacterized. Here, we combine forward and reverse genetic screens to delineate a network of 184 genes that affect the C. elegans dietary response to Comamonas DA1877 bacteria. We find that perturbation of a mitochondrial network comprised of enzymes involved in amino acid metabolism and the TCA cycle affects the dietary response. In humans, mutations in the corresponding genes cause inborn diseases of amino acid metabolism, most of which are treated by dietary intervention. We identify several TFs that mediate the changes in gene expression upon metabolic network perturbations. Altogether, our findings unveil a transcriptional response system that is poised to sense dietary cues and metabolic imbalances, illustrating extensive communication between metabolic networks in the mitochondria and gene regulatory networks in the nucleus. 3 biological replicates for each condition, wild type is reference sample
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