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PAX6 expression in the developing human eye
S Nishina1, S Kohsaka, Y Yamaguchi
1Department of Ophthalmology, National Children's Hospital, Tokyo, Japan.
Insights
PAX6, a crucial gene, is expressed early in human eye development, appearing in surface and neuroectoderms. Its expression continues in differentiating ocular tissues, suggesting a role in eye morphogenesis.
Area of Science:
- Developmental Biology
- Ophthalmology
- Molecular Biology
Background:
- The PAX6 gene is a key regulator in the development of the eye.
- Understanding PAX6 expression patterns is vital for comprehending ocular morphogenesis.
Purpose of the Study:
- To investigate the spatiotemporal expression patterns of PAX6 during human eye development.
- To elucidate the potential role of PAX6 in ocular tissue differentiation.
Main Methods:
- Immunohistochemical staining of PAX6 in human embryonic eye sections (6-22 weeks gestation).
- Western blot analysis to confirm antibody specificity against human PAX6 protein.
Main Results:
- PAX6 was detected in the surface ectoderm, optic cup, and stalk early in development (6 weeks).
- Expression persisted in the cornea, lens, ciliary body, and retina throughout development (8-22 weeks).
- Retinal expression shifted from widespread to specific layers (ganglion cell layer, inner nuclear layer) by 21 weeks.
Conclusions:
- PAX6 demonstrates dynamic expression in the developing human eye, from early neuroectoderm to differentiating ocular tissues.
- PAX6 likely plays a significant role in cell fate determination during the morphogenesis of the human eye.
Aims:
To investigate the changes in PAX6 expression in the developing human eye.
Methods:
Six developing human eyes from 6 to 22 weeks' gestation were evaluated. Frozen sections were immunohistochemically stained with monoclonal antibody to chick Pax6 (amino acids 1-223). To verify antibody specificity, western blot analysis was carried out using cell lysates from P19 cells transfected with the human PAX6 gene.
Results:
Western blot analysis demonstrated that the antibody reacted to human PAX6 protein. Positive immunostainings for PAX6 were seen in the surface ectoderm, lens vesicle, inner and outer layers of the optic cup, and optic stalk at 6 weeks, and in the corneal epithelia and conjunctiva, lens, and non-pigmented ciliary epithelia from 8 to 22 weeks. In the retina, positive cells were seen in the entire retina from 8 to 10 weeks, and were restricted to the ganglion cell layer and the inner and outer portions of the inner nuclear layer after 21 weeks.
Conclusions:
PAX6 is expressed on the surface and neuroectoderms at an early stage, then in the differentiating cells in the cornea, lens, ciliary body, and retina through development. PAX6 may play a role in determining cell fate in the morphogenesis of various human ocular tissue.