Related Experiment Video
Updated: Jun 14, 2025
Analysis of Transforming Growth Factor ß Family Cleavage Products Secreted Into the Blastocoele of Xenopus laevis Embryos
Published on: July 21, 2021
Overexpression of Bmp4 induces microphthalmia by disrupting embryonic neural retina
Baige Li1, Zeyuan Pu1, Keren Liao1
1Eye Center, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, China.
Abstract:
Microphthalmia, mostly an autosomal dominant disorder, is a worldwide severe congenital ocular malformation that causes visual impairment. Our investigation unveiled a total of 30 genes associated with microphthalmia. Employing the CytoHubba and PPI network, we identified Bmp4 as the most pivotal hub gene. Subsequently, the conditional overexpression of Bmp4 in the retina caused highly distinctive microphthalmia, manifested by retinal disorganization with ganglion cell misalignment. Significant reduction in the number and abnormal distribution location of retinal cells in microphthalmia model mice. Elevated Bmp4 was associated with an increase in retinal apoptosis and a decrease in proliferating cells, which exacerbates the development of microphthalmia. Here we identify Bmp4 as an extremely important gene responsible for microphthalmia and the involved mechanisms. Overexpression of Bmp4 induces retinal cell ectopic expression and developmental defects, highlighting the importance of a well-balanced Bmp4 level in shaping the embryonic retina during early development.
Insights
This study identifies Bone Morphogenetic Protein 4 (Bmp4) as a key gene in microphthalmia, a severe eye malformation. Elevated Bmp4 levels disrupt retinal development, causing cell disorganization and visual impairment.
Area of Science:
- Developmental Biology
- Ophthalmology
- Genetics
Background:
- Microphthalmia is a severe congenital ocular malformation causing visual impairment.
- It is often an autosomal dominant disorder with numerous associated genes.
Purpose of the Study:
- To identify key genes involved in microphthalmia.
- To elucidate the role of Bone Morphogenetic Protein 4 (Bmp4) in retinal development and microphthalmia pathogenesis.
Main Methods:
- Bioinformatic analysis using CytoHubba and Protein-Protein Interaction (PPI) networks to identify hub genes.
- Conditional overexpression of Bmp4 in mouse retinas.
- Histological analysis and cell counting in microphthalmia models.
Main Results:
- Identified 30 genes associated with microphthalmia, with Bmp4 emerging as a pivotal hub gene.
- Conditional Bmp4 overexpression in the retina induced microphthalmia, characterized by retinal disorganization and ganglion cell misalignment.
- Elevated Bmp4 led to reduced retinal cell numbers, abnormal cell distribution, increased apoptosis, and decreased proliferation.
Conclusions:
- Bmp4 is a critical gene in microphthalmia development.
- Aberrant Bmp4 levels disrupt embryonic retinal development, leading to microphthalmia.
- Maintaining a balanced Bmp4 level is essential for normal embryonic retinal formation.
