Mechanisms of cell specification and differentiation in vertebrate cranial sensory systems

Abstract

Vertebrates sense a large variety of sensory stimuli that ranges from temperature, volatile and nonvolatile chemicals, touch, pain, light, sound and gravity. To achieve this, they use specialized cells present in sensory organs and cranial ganglia. Much of our understanding of the transcription factors and mechanisms responsible for sensory cell specification comes from cell-lineage tracing and genetic experiments in different species, but recent advances in single-cell transcriptomics, high-resolution imaging and systems biology approaches have allowed to study these processes in an unprecedented resolution. Here I will point to the transcription factor programs driving cell diversity in the different sensory organs of vertebrates to then discuss in vivo data of how cell specification is coupled with tissue morphogenesis.

Keywords: Cell identity; Cell specification; Cranial placodes; Hair cells; Morphogenesis; Olfactory; Sensory neurons; Sensory systems; Transcription factors; scRNA-seq.