The long noncoding RNA nHOTAIRM1 is necessary for differentiation and activity of iPSC-derived spinal motor neurons.
Paolo TollisErika VitielloFrancesco MigliaccioEleonora D'AmbraAnna RocchegianiMaria Giovanna GaroneIrene BozzoniAlessandro RosaAnnamaria CarissimoPietro LaneveElisa CaffarelliPublished in: Cell death & disease (2023)
The mammalian nervous system is made up of an extraordinary array of diverse cells that form intricate functional connections. The programs underlying cell lineage specification, identity and function of the neuronal subtypes are managed by regulatory proteins and RNAs, which coordinate the succession of steps in a stereotyped temporal order. In the central nervous system (CNS), motor neurons (MNs) are responsible for controlling essential functions such as movement, breathing, and swallowing by integrating signal transmission from the cortex, brainstem, and spinal cord (SC) towards peripheral muscles. A prime role in guiding the progression of progenitor cells towards the MN fate has been largely attributed to protein factors. More recently, the relevance of a class of regulatory RNAs abundantly expressed in the CNS - the long noncoding RNAs (lncRNAs) - has emerged overwhelmingly. LncRNA-driven gene expression control is key to regulating any step of MN differentiation and function, and its derangement profoundly impacts neuronal pathophysiology. Here, we uncover a novel function for the neuronal isoform of HOTAIRM1 (nHOTAIRM1), a lncRNA specifically expressed in the SC. Using a model system that recapitulates spinal MN (spMN) differentiation, we show that nHOTAIRM1 intervenes in the binary cell fate decision between MNs and interneurons, acting as a pro-MN factor. Furthermore, human iPSC-derived spMNs without nHOTAIRM1 display altered neurite outgrowth, with a significant reduction of both branch and junction numbers. Finally, the expression of genes essential for synaptic connectivity and neurotransmission is also profoundly impaired when nHOTAIRM1 is absent in spMNs. Mechanistically, nHOTAIRM1 establishes both direct and indirect interactions with a number of target genes in the cytoplasm, being a novel post-transcriptional regulator of MN biology. Overall, our results indicate that the lncRNA nHOTAIRM1 is essential for the specification of MN identity and the acquisition of proper morphology and synaptic activity of post-mitotic MNs.
Keyphrases
- spinal cord
- long noncoding rna
- cell fate
- gene expression
- room temperature
- transcription factor
- transition metal
- metal organic framework
- induced pluripotent stem cells
- long non coding rna
- neuropathic pain
- spinal cord injury
- endothelial cells
- genome wide
- blood brain barrier
- poor prognosis
- dna methylation
- public health
- genome wide identification
- single cell
- functional connectivity
- cell cycle
- cerebral ischemia
- high resolution
- oxidative stress
- cell proliferation
- ionic liquid
- cell cycle arrest
- multiple sclerosis
- heat stress
- protein protein