Neurons in humans and other mammals express many exceptionally long genes, ranging from more than 100 kbp to more than 2 Mbp, that are important for forming synapses and neural circuits. In general, genetic information is read from DNA into RNA. This process is called transcription.
Source: [Phys.org](https://phys.org/news/2026-09-mechanism-extra-genes-neurons.html)