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Axon guidance genes are regulated by TDP-43 and RGNEF through the rate of long-intron processing
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Axon guidance genes are regulated by TDP-43 and RGNEF through the rate of long-intron processing
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Paper
Axon guidance genes are regulated by TDP-43 and RGNEF through the rate of long-intron processing
2023
Overview
Rho guanine nucleotide exchange factor (RGNEF) is a guanine nucleotide exchange factor (GEF) mainly involved in regulating the activity of Rho-family GTPases. Previous work has shown that RGNEF inclusions in the spinal motor neurons of ALS patients co-localise with TDP-43, the major RNA binding protein aggregating in the brain and spinal cord of ALS patients. To further characterise their relationship, we have compared the transcriptomic profiles of neuronal-like cells depleted of TDP-43 and RGNEF and show that these two factors predominantly act in an antagonistic manner when regulating the expression of axon guidance genes. From a mechanistic point of view, our experiments show that the effect of these factors on the processivity of long introns can explain their mode of action. Our findings highlight that neurodegenerative processes at the RNA level can often represent the result of combinatorial interactions between different RNA binding factors, leading to a better understanding of pathogenic mechanisms occurring in patients where more than one specific protein may be aggregating in their neurons.
Publisher
Cold Spring Harbor Laboratory Press,Cold Spring Harbor Laboratory
