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Loss of mitochondrial proline catabolism depletes FAD, impairing sperm function, and male reproductive advantage

ABSTRACT: Loss of mitochondrial proline catabolism depletes FAD, impairing sperm function, and male reproductive advantage

PROVIDER: PRJNA499069 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8128840_1.fastq.gz	Fastqsanger.gz
	SRR8128840_2.fastq.gz	Fastqsanger.gz
	SRR8128841_1.fastq.gz	Fastqsanger.gz
	SRR8128841_2.fastq.gz	Fastqsanger.gz
	SRR8128842_1.fastq.gz	Fastqsanger.gz

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Loss of mitochondrial proline catabolism depletes FAD, impairing sperm function, and male reproductive advantage

Project description:Exposure to environmental stress has a clinically established influence on male reproductive health, but the impact of normal cellular metabolism on sperm quality and function is less well-defined. Here we show that homeostatic changes in mitochondrial dynamics driven by defective mitochondrial proline catabolism result in pleiotropic consequences on sperm quality and competitive fitness. Disruption of alh-6, which converts 1-pyrroline-5-carboxylate (P5C) to glutamate, results in P5C accumulation that drives oxidative stress, activation of the cytoprotective transcription factor SKN-1, and a reduction of energy-storing flavin adenine dinucleotide (FAD) levels. These molecular changes lead to premature male reproductive senescence by reducing sperm quality. These sperm-specific defects are suppressed by abating P5C metabolism, by treatment with antioxidants to combat reactive oxygen species (ROS), or by feeding diets that restore FAD levels. Our results define a role for mitochondrial proline catabolism and FAD homeostasis on sperm function and specify strategies to pharmacologically reverse unintended outcomes from SKN-1/Nrf transcriptional activation.

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Hepatitis C virus RNA is 5’ flavin adenine dinucleotide (FAD) capped

Project description:RNA viruses have developed elaborate strategies for 5’ capping and protection of their genomes. However, so far no 5’ RNA cap has been identified for Hepatitis C virus (HCV), which cause chronic infection, liver cirrhosis and cancer in humans4. Here, we demonstrate that the cellular metabolite flavin adenine dinucleotide (FAD) is used as noncanonical initiating nucleotide by the viral RNA-dependent RNA polymerase resulting in a 5’ FAD cap on the HCV RNA. FAD capping is completely conserved for the HCV replication intermediate negative RNA strand and partially for the positive RNA strand. The prototype strain J6/JFH1 RNA is FAD capped when isolated from the liver and serum of a human liver chimeric mouse model and in vitro the FAD capping frequency is ~75 %, which is the highest metabolite RNA capping frequency observed. Furthermore, we show that 5’ FAD capping protects RNA from cell-intrinsic innate immune recognition but has limited effect on HCV RNA stability. These results establish capping with cellular metabolites, such as FAD, as a novel viral RNA capping and immune evasion strategy, which potentially could be used by many viruses for protection of their intermediate RNA strands and thereby affect viral treatment outcomes and persistency.

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Project description:Riboflavin (RF) and its cofactors (FMN and FAD) are essential molecules for vital metabolic processes in all organisms. Thus, the flavin metabolism must be tightly regulated in the cells. We previously demonstrated that the intracellular levels of flavins were tightly maintained by the enzymes involved in their synthesis and degradation, inducing a plastidic FAD hydrolase (AtNUDX23), in Arabidopsis. However, information of regulatory factors involved in the flavin homeostasis and transporters in each organelle are mostly limited. Terefore, we tried to identify novel factors involved in the flavin metabolism, such as transcription factors and transporters by a transcriptome analysis after exogenous FAD treatment.

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Project description:Epigenetic alterations has been implicated in the pathology of several neurodegenerative diseases. To investigate the role of microglial Hdac1 and 2 in the pathogenesis of Alzheimer's disease (AD), we created microglia specific compound Hdac1 and Hdac2 knock out mice in 5X FAD background. Genetic ablation of Hdac1 and 2 from microglia reduced amyloid plaque burden and improved spatial learning and memory function. To study how Hdac1 and 2 knock out in microglia alters gene expression profile in 5X FAD mice we carry out microarray analysis using 24-28 weeks animals

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