title: SoxNeuro orchestrates central nervous system specification and differentiation in Drosophila and is only partially redundant with Dichaete.
abstract: BACKGROUND
  Sox proteins encompass an evolutionarily conserved family of transcription factors with critical roles in animal development and stem cell biology. In common with vertebrates, the Drosophila group B proteins SoxNeuro and Dichaete are involved in central nervous system development, where they play both similar and unique roles in gene regulation. Sox genes show extensive functional redundancy across metazoans, but the molecular basis underpinning functional compensation mechanisms at the genomic level are currently unknown.
  
  
  RESULTS
  Using a combination of genome-wide binding analysis and gene expression profiling, we show that SoxNeuro directs embryonic neural development from the early specification of neuroblasts through to the terminal differentiation of neurons and glia. To address the issue of functional redundancy and compensation at a genomic level, we compare SoxNeuro and Dichaete binding, identifying common and independent binding events in wild-type conditions, as well as instances of compensation and loss of binding in mutant backgrounds.
  
  
  CONCLUSIONS
  We find that early aspects of group B Sox functions in the central nervous system, such as stem cell maintenance and dorsoventral patterning, are highly conserved. However, in contrast to vertebrates, we find that Drosophila group B1 proteins also play prominent roles during later aspects of neural morphogenesis. Our analysis of the functional relationship between SoxNeuro and Dichaete uncovers evidence for redundant and independent functions for each protein, along with unexpected examples of compensation and interdependency, thus providing new insights into the general issue of transcription factor functional redundancy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Ferrero
authors.forename: Bettina
authors.initials: B
authors.lastname: Fischer
authors.forename: Steven
authors.initials: S
authors.lastname: Russell
mesh_terms: D000818:Animals; D001665:Binding Sites; D019521:Body Patterning; D002454:Cell Differentiation; D002490:Central Nervous System / Q000196:embryology / Q000378:metabolism; D029721:Drosophila Proteins / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000196:embryology* / Q000378:metabolism*; D020869:Gene Expression Profiling / Q000379:methods; D018507:Gene Expression Regulation, Developmental; D008969:Molecular Sequence Data; D009928:Organ Specificity; D055747:SOX Transcription Factors / Q000378:metabolism*
chemical_list: C103073:D protein, Drosophila; D029721:Drosophila Proteins; D055747:SOX Transcription Factors; C412366:SoxN protein, Drosophila