Loss of Axin2 Causes Ocular Defects During Mouse Eye Development

Area of Science:

• Developmental Biology
• Molecular Biology
• Ophthalmology

Background:

• Axin2 is a key regulator of the Wnt/β-catenin signaling pathway.
• The Wnt/β-catenin pathway is vital for embryonic development.
• The specific role of Axin2 in ocular development was previously unexamined.

Purpose of the Study:

• To investigate the function of Axin2 in mouse ocular and extraocular development.
• To determine the spatiotemporal expression pattern of Axin2 during eye development.

Main Methods:

• Utilized Axin2lacZ knock-in mice to track reporter gene expression.
• Analyzed ocular and extraocular tissues using histological and immunohistochemical techniques.
• Examined developmental stages from embryonic to postnatal periods.

Main Results:

• Axin2 expression was observed in periocular mesenchyme, RPE, optic stalk, retinal ganglion cells, amacrine, and horizontal cells.
• Germline deletion of Axin2 resulted in a spectrum of ocular defects, including microphthalmia, coloboma, and lens abnormalities.
• Observed abnormal tissue patterning in affected ocular structures, such as optic fissure and ciliary margin.

Conclusions:

• Axin2 plays a critical role in mammalian eye development.
• Axin2 likely functions by modulating Wnt/β-catenin pathway activity during ocular morphogenesis.
• Understanding Axin2's role provides insights into developmental eye disorders.