DOI: https://doi.org/10.21897/rmvz.1370

Patrones de expresiòn del gen Hey1 durante el desarrollo de arcos branquiales y prominencias faciales

Hey1 gene expression patterns during the development of branchial arches and facial prominences

Belfran Carbonell M, Francy Bayona R, Zayra V Garavito-Aguilar, Carolina Parada B, Humberto Arboleda G, Clementina Infante-Contreras C

Resumen


Objetivo. El presente estudio tuvo como objetivo describir detalladamente los patrones de expresión del gen Hey1, un efector de la vía Notch durante el desarrollo de arcos branquiales y prominencias faciales. Materiales y métodos. Se incubaron huevos fertilizados de pollo (Gallus gallus) obtenidos de una granja local entre 37.5-38.5ºC con humedad relativa del 70% hasta que los embriones alcanzaron los estadios HH14 hasta HH25 de Hamilton-Hamburger. Las sondas Hey1 marcadas con digoxigenina-UTP se generaron a partir de plásmidos linearizados con T3 polimerasa por transcripción in vitro. Luego se realizó hibridación in situ sobre embriones completos. Se obtuvieron al menos 3 repeticiones (n = 3) para cada estadio. Para confirmar los resultados observados en embriones completos, se realizaron cortes sagitales y coronales de 10 µm. Resultados. Durante los estadios de desarrollo HH14 y HH18, la expresión del gen Hey1 se localizó en el endodermo de las bolsas branquiales. La expresión génica de Hey1 también se observó en el epitelio que cubre las prominencias maxilares y mandibulares durante las etapas de desarrollo HH19 y HH21, así como en el epitelio nasal entre HH19 y HH25.  También se detectaron transcritos de Hey1 en el epitelio que cubre la prominencia frontonasal durante la etapa HH21. Conclusiones. Estos patrones de expresión sugieren la participación de este componente de la vía de señalización Notch en la morfogénesis craneofacial, posiblemente estableciendo patrones de segmentación faríngea durante las primeras etapas y / o regulando la proliferación y diferenciación celular durante las últimas etapas del desarrollo facial.


Palabras clave


Desarrollo craneofacial; ectodermo facial; embrión de pollo; prominencia frontonasal prominencia mandibular

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