Assembly of the Brainstem Cochlear Nuclear Complex Is Revealed by Intersectional and Subtractive Genetic Fate Maps

Anna F. Farago, Rajeshwar B. Awatramani, Susan M. Dymecki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

166 Scopus citations

Abstract

The cochlear nuclear complex (CN) is the entry point for central auditory processing. Although constituent neurons have been studied physiologically, their embryological origins and molecular profiles remain obscure. Applying intersectional and subtractive genetic fate mapping approaches, we show that this complex develops modularly from genetically separable progenitor populations arrayed as rostrocaudal microdomains within and outside the hindbrain (lower) rhombic lip (LRL). The dorsal CN subdivision, structurally and topographically similar to the cerebellum, arises from microdomains unexpectedly caudal and noncontiguous to cerebellar primordium; ventral CN subdivisions arise from more rostral LRL. Magnocellular regions receive contributions from LRL and coaxial non-lip progenitors; contrastingly, ensheathing granule cells derive principally from LRL. Also LRL-derived and molecularly similar to CN granule cells are precerebellar mossy fiber neurons; surprisingly, these ostensibly intertwined populations have separable origins and adjacent but segregated migratory streams. Together, these findings provide new platforms for investigating the development and evolution of auditory and cerebellar systems.

Original languageEnglish (US)
Pages (from-to)205-218
Number of pages14
JournalNeuron
Volume50
Issue number2
DOIs
StatePublished - Apr 20 2006

Keywords

  • DEVBIO
  • MOLNEURO

ASJC Scopus subject areas

  • Neuroscience(all)

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