Pax genes in development and maturation of the vertebrate visual system: implications for optic nerve regeneration.

Abstract:

:Pax genes play a pivotal role in development of the vertebrate visual system. Pax6 is the master control gene for eye development: ectopic expression of Pax6 in Xenopus laevis and Drosphila melanogaster leads to the formation of differentiated eyes on the legs or wings. Pax6 is involved in formation of ganglion cells of the retina, as well as cells of the lens, iris and cornea. In addition Pax6 may play a role in axon guidance in the visual system. Pax2 regulates differentiation of the optic disk through which retinal ganglion cell axons exit the eye. Furthermore, Pax2 plays a critical role in development of the optic chiasm and in the guidance of axons along the contralateral or ipsilateral tracts of the optic nerve to visual targets in the brain. During development Pax7 is expressed in neuronal cells of one of the major visual targets in the brain, the optic tectum/superior colliculus. Neurons expressing Pax7 migrate towards the pia and concentrate in the stratum griseum superficiale (SGFS), the target site for retinal axons. Together, expression of Pax2, 6 and 7 may guide axons during formation of functional retinotectal/collicular projections. Highly regulated Pax gene expression is also observed in mature animals. Moreover, evidence suggests that Pax genes are important for regeneration of the visual system. We are currently investigating Pax gene expression in species that display a range of outcomes of optic nerve regeneration. We predict that such information will provide valuable insights for the induction of successful regeneration of the optic nerve and of other regions of the central nervous system in mammals including man.

journal_name

Histol Histopathol

authors

Ziman MR,Rodger J,Chen P,Papadimitriou JM,Dunlop SA,Beazley LD

doi

10.14670/HH-16.239

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

239-49

issue

1

eissn

0213-3911

issn

1699-5848

journal_volume

16

pub_type

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