Fscn2, also known as Fascin2, encodes an actin cross-linking protein. It is involved in the formation of hair cell stereocilia and retina structure [2]. The gene may play a role in regulating cell-related processes such as proliferation and migration through its influence on certain pathways. Genetic models, like gene-knockout mouse models, are valuable for studying Fscn2.

In Fscn2 knockout mice, there is progressive loss of hearing and hair cells, along with upregulation of PARVB, which leads to inhibition of the ILK-AKT pathway and cochlear cell death [2]. These mice also show increased susceptibility to cisplatin-induced hearing impairment and cochlear cell apoptosis [3]. In terms of the retina, haploinsufficiency of Fscn2 hampers the maintenance and/or elongation of the outer segment disks, resulting in photoreceptor degeneration, similar to human autosomal dominant retinitis pigmentosa [1].

In conclusion, Fscn2 is essential for maintaining ear and eye function. Gene-knockout mouse models have revealed its role in preventing cochlear cell death, protecting against cisplatin-induced ototoxicity, and maintaining the structure and function of the retina. These findings contribute to understanding the mechanisms of genetic hearing loss and retinal degeneration.