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Alternative splicing (AS) generates vast transcriptomic and proteomic complexity. However, which of the myriad of detected AS events provide important biological functions is not well understood. Here, we define the largest program of functionally coordinated, neural-regulated AS described to date in mammals. Relative to all other types of AS within this program, 3-15 nucleotide "microexons" display the most striking evolutionary conservation and switch-like regulation. These microexons modulate the function of interaction domains of proteins involved in neurogenesis. Most neural microexons are regulated by the neuronal-specific splicing factor nSR100/SRRM4, through its binding to adjacent intronic enhancer motifs. Neural microexons are frequently misregulated in the brains of individuals with autism spectrum disorder, and this misregulation is associated with reduced levels of nSR100. The results thus reveal a highly conserved program of dynamic microexon regulation associated with the remodeling of protein-interaction networks during neurogenesis, the misregulation of which is linked to autism.
Alternative splicing (AS) patterns have diverged rapidly during vertebrate evolution, yet the functions of most species- and lineage-specific splicing events are not known. We observe that mammalian-specific AS events are enriched in transcript sequences encoding intrinsically disordered regions (IDRs) of proteins, in particular those containing glycine/tyrosine repeats that mediate formation of higher-order protein assemblies implicated in gene regulation and human disease. These evolutionary changes impact nearly all members of the hnRNP A and D families of RNA binding proteins. Regulation of these events requires formation of unusual, long-range mammalian-specific RNA duplexes. Differential inclusion of the alternative exons controls the formation of tyrosine-dependent multivalent hnRNP assemblies that, in turn, function to globally regulate splicing. Together, our results demonstrate that AS control of IDR-mediated interactions between hnRNPs represents an important and recurring mechanism underlying splicing regulation. Furthermore, this mechanism has expanded the regulatory capacity of mammalian cells.
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