Visual system function requires translational regulation of ATF4 by Hbs1-Pelo.

Hbs1-Pelo complex regulates ATF4 translation, and its disruption causes phototransduction defects leading to vision loss in Drosophila and humans.

• Why it matters: Understanding the molecular basis of vision defects linked to HBS1L mutations is crucial for developing targeted therapies for inherited retinal diseases caused by these mutations.
• What they did: The study used Drosophila models and human cell cultures to show that Hbs1 and Pelo are essential for proper phototransduction and that loss of HBS1L reduces ATF4 levels, impairing neuron function.
• The result: Restoring ATF4 expression partially rescues visual defects, suggesting that Hbs1-Pelo-mediated regulation of ATF4 translation is a key mechanism underlying vision loss associated with HBS1L deletion.