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Volume 628 Issue 8009, 25 April 2024

Switching channels

Timothy syndrome, a rare genetic disorder characterized by heart defects, autism and epilepsy, is caused by a mutant form of the gene CACNA1C, which encodes a calcium-ion channel. In this week’s issue, Sergiu Pașca and colleagues present a potential strategy for correcting defects caused by the mutation and treating the syndrome. The researchers developed antisense oligonucleotides aimed at decreasing the gene’s use of the protein-coding sequence that carries the mutation in favour of another sequence. They then tested this approach in 3D tissue models — cortical organoids and forebrain assembloids — which they derived from stem cells collected from people with Timothy syndrome. With this proving successful, the team then transplanted the organoids into the cerebral cortex of newborn rats, where they were able to show that treatment with antisense oligonucleotides corrected calcium and nerve cell structural issues caused by the defective gene. The cover features a drone photo of ice patterns that resemble neuron growth.

Cover image: Gheorghe Popa

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