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Related Concept Videos

Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...

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Gene Transfer into the Chicken Auditory Organ by In Ovo Micro-electroporation
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Meis gene expression patterns in the developing chicken inner ear.

Luis Óscar Sánchez-Guardado1, José Luis Ferran, Lucía Rodríguez-Gallardo

  • 1Department of Cell Biology, School of Science, University of Extremadura, Badajoz E06071, Spain. mhidalgo@unex.es

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|December 2, 2010
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Summary

Meis1 and Meis2 genes are crucial for inner ear development, guiding its patterning and specification. Their sequential gene network activities help form distinct inner ear structures during embryonic development.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Otolaryngology

Background:

  • Inner ear specification involves sequential gene network activities crucial for forming functional subdivisions of the otic vesicle.
  • Meis genes, encoding TALE family transcription factors, are vital for normal development and have been implicated in neoplastic development.
  • The developing vertebrate inner ear serves as a model for studying developmental mechanisms controlling patterning and specification.

Purpose of the Study:

  • To investigate the role of homeobox Meis genes in chick inner ear development.
  • To comprehensively analyze the spatiotemporal expression patterns of Meis1 and Meis2 during early otic specification.

Main Methods:

  • Analysis of spatiotemporal expression patterns of Meis1 and Meis2 transcripts in chick embryos from early otic specification stages.
  • Detailed observation of gene expression in the invaginating otic placode, otic cup, and developing inner ear structures.

Main Results:

  • Meis1/2 transcripts were initially found at the borders of the otic cup, excluding the hindbrain-adjacent region.
  • Expression of Meis1 and Meis2 later became restricted to the dorsomedial otic epithelium.
  • Both genes showed strong expression in the presumptive semicircular canals and weaker expression in associated cristae, with partial labeling of the endolymphatic apparatus. Meis1 was also noted in the cochlear duct, and Meis2 in the acoustic-vestibular ganglion.

Conclusions:

  • Meis genes likely play a role in assigning regional identity during inner ear morphogenesis.
  • The findings suggest Meis1 and Meis2 are involved in the patterning and specification of the developing chick inner ear.
  • These genes contribute to the establishment of distinct structural and functional domains within the inner ear.