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Effect of deletion or isoform-specific expression of the C. elegans mbl-1 gene on miRNA expression.

ABSTRACT: MBL-1 is an RNA-binding protein important for the differentiation and development of many animal tissues. An evolutionarily conserved alternative splicing mechanism generates MBL-1 isoforms that are either expressed in the nucleus or show a more cytoplasmic distribution. We used small RNA-seq to investigate the individual contribution of evolutionarily conserved mbl-1 isoform expression of C. elegans miRNA expression. The analysis was done on L4 stage animals

ORGANISM(S): Caenorhabditis elegans

PROVIDER: GSE249407 | GEO | 2023/12/12

REPOSITORIES: GEO

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Effect of deletion or isoform-specific expression of the C. elegans mbl-1 gene on gene expression.

Project description:MBL-1 is an RNA-binding protein important for the differentiation and development of many animal tissues. An evolutionarily conserved alternative splicing mechanism generates MBL-1 isoforms that are either expressed in the nucleus or show a more cytoplasmic distribution. We used RNA-seq to investigate the individual contribution of evolutionarily conserved mbl-1 isoform expression of C. elegans gene expression and to identify pathways associated with isoform expression. The analysis was done on L4 stage animals

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Identification of MBL-1 target transcript through RIP-seq.

Project description:MBL-1 is an RNA-binding protein important for the differentiation and development of many animal tissues. Our aim was to identify the binding targets of the MBL-1 protein in C. elegans. RNA from a CRISPR/CAS9-generated strain expressing a 3xFLAG-tagged MBL-1 protein was immunopreciprecipitated with an anti-FLAG antibody. RNA-seq was then performed to identify binding targets of the RNA-binding protein MBL-1. Experiments were performed at the L4 stage.

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MBL-1/Muscleblind regulates neuronal differentiation and controls the splicing of a terminal selector in Caenorhabditis elegans

Project description:The muscleblind family of mRNA splicing regulators is conserved across species and regulate the development of muscles and the nervous system. However, how Muscleblind proteins regulate neuronal fate specification and neurite morphogenesis at the single-neuron level is not well understood. In this study, we found that the C. elegans Muscleblind/MBL-1 promotes axonal growth in the touch receptor neurons (TRNs) by regulating microtubule stability and polarity. Transcriptomic analysis identified dozens of MBL-1-controlled splicing events in genes related to neuronal differentiation or microtubule functions. Among the MBL- 1 targets, the LIM-domain transcription factor mec-3 is the terminal selector for the TRN fate and induces the expression of many TRN terminal differentiation genes. MBL-1 promotes the splicing of the mec-3 long isoform, which are essential for TRN fate specification, and inhibits the short isoforms that have much weaker activities in activating downstream genes. MBL-1 promotes mec-3 splicing through three “YGCU(U/G)Y” motifs located downstream of the included exon, which is similar to the mechanisms used by mammalian Muscleblind and suggests a deeply conserved context-dependency of the splicing regulation. Interestingly, the expression of mbl-1 in the TRNs is dependent on the mec-3 long isoform, indicating a positive feedback loop between the splicing regulator and the terminal selector. Finally, through a forward genetic screen, we found that MBL-1 promotes neurite growth partly by inhibiting the DLK-1/p38 MAPK pathway. In summary, our study provides mechanistic understanding of the role of Muscleblind in regulating cell fate specification and neuronal morphogenesis.

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Project description:MBL-1

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Gene expression in homozygous mbl/axin1 zebrafish

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Effect of mannose-binding lectin (MBL) on pulmonary gene expression in response to ozone

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