Two Hoxc6 transcripts are differentially expressed and regulate primary neurogenesis in Xenopus laevis

Area of Science:

• Developmental Biology
• Genetics
• Neuroscience

Background:

• Hox genes establish positional identity along the vertebrate embryonic body axis.
• Hoxc6, the first homeobox gene identified in Xenopus laevis, encodes two isoforms.
• Hox genes are critical for positional information within the spinal cord's primary neurons.

Purpose of the Study:

• To investigate the spatial and temporal expression of Hoxc6 isoforms during early Xenopus development.
• To determine the function of Hoxc6 in neural development, particularly in primary neuron formation.
• To explore Hoxc6's role beyond anterior-posterior patterning.

Main Methods:

• Analysis of Hoxc6 spatial and temporal expression patterns.
• Loss-of-function experiments for Hoxc6 isoforms.
• Assessment of neural induction and general neural marker expression.
• Evaluation of neuronal markers N-tubulin and Islet-1 expression.
• Observation of primary neuron and cranial nerve formation.

Main Results:

• Hoxc6 loss-of-function does not affect neural induction or general neural markers.
• Hoxc6 significantly impacts the formation of primary neurons in the developing neural tissue.
• Expression of neuronal markers N-tubulin and Islet-1 is severely altered by Hoxc6 manipulation.
• Formation of primary neurons and cranial nerves is compromised.

Conclusions:

• Hoxc6 plays a crucial role in the initial formation of primary neurons in Xenopus laevis.
• Hoxc6's functions extend beyond anterior-posterior patterning to regulate neuronal differentiation.
• Hoxc6 directly influences the expression of key neuronal markers like N-tubulin.