Lab-Grown Retina Reveals Genetic Clues to Rare Childhood Eye Condition

Scientists led by the University of Manchester have used lab-grown miniature retinas to identify how specific changes in a growth-controlling protein contribute to ocular coloboma, a rare congenital eye condition. The research, published on April 13, 2026, in the journal BBA: Molecular Basis of Disease, provides new insights into the genetic mechanisms that cause serious eye defects from birth.

Ocular coloboma is a rare condition that affects approximately 1 in 5,000 births. It is responsible for roughly 10% of childhood blindness. The condition occurs when the optic fissure, a structure in the developing eye, fails to close properly during gestation.

Because the optic fissure is involved in tissue fusion, coloboma often co-occurs with other fusion-related issues, such as a cleft palate or cleft lip.

The Role of the YAP1 Protein

The research focused on YAP1, a protein that functions as a cellular switch. This protein helps guide the formation of organs and ensures tissues remain healthy by signaling to cells when they should grow, change, or survive.

While previous research had linked changes in YAP1 to the development of coloboma, scientists had not yet understood why some individuals with these genetic changes developed severe eye defects while others remained unaffected.

To resolve this uncertainty, the research team tested different variants of the YAP1 protein to compare their specific effects on eye development.

Using Retinal Organoids for Discovery

To observe the consequences of YAP1 inactivity, the researchers utilized human retinal organoids. These are lab-grown, miniature versions of the developing human retina.

By reducing the activity of YAP1 within these organoids, the team observed direct effects on the growth and development of early retinal cells.

The study found that disrupting YAP1 reduced the activity of genes essential for early retinal cells to grow and maintain their identity. These cells developed more slowly, which the researchers suggest provides a potential explanation for how eye formation fails.

The findings also indicated that not all YAP1 variants produce the same effect, explaining the variability in how the condition manifests in different people.

Collaborative Research Effort

The study was a collaborative effort involving multiple institutions. In addition to the University of Manchester, researchers from the Manchester University NHS Foundation Trust and the Greenwood Genetic Centre in the United States were involved in the work.

By using these lab-grown models, the team was able to simulate the early stages of human eye development and pinpoint the genetic triggers that lead to the failure of the optic fissure to close.