Elp1 function in placode-derived neurons is critical for proper trigeminal ganglion development

Area of Science:

• Developmental Neuroscience
• Molecular Biology
• Genetics

Background:

• The trigeminal nerve, the largest cranial nerve, originates from neural crest and placode cells.
• Molecular mechanisms governing trigeminal ganglion development are not fully understood.
• Elongator acetyltransferase complex subunit 1 (Elp1) mutations are linked to familial dysautonomia (FD), characterized by sensory deficits.

Purpose of the Study:

• To investigate the role of Elp1 in trigeminal placode cells during trigeminal ganglion development.
• To elucidate the molecular functions of Elp1 in placode-derived neurons.

Main Methods:

• RNA sequencing of developing chick trigeminal ganglia to identify key genes.
• Morpholino-mediated knockdown of Elp1 in chick trigeminal placode cells.
• Analysis of trigeminal ganglion size, innervation patterns, and cell interactions.

Main Results:

• Elp1 knockdown in trigeminal placode cells significantly reduced trigeminal ganglion size.
• Depletion of Elp1 led to aberrant innervation of target tissues by placode-derived neurons.
• Abnormal interactions between neural crest and placode-derived neurons were observed.

Conclusions:

• Elp1 plays a novel and essential role in chick placode-derived neurons during trigeminal ganglion development.
• These findings provide new insights into trigeminal ganglion development and the pathogenesis of familial dysautonomia.
• Elp1 is critical for proper neuronal differentiation, migration, and interaction in the developing trigeminal system.