Utrophin gene promoter and enhancer DNA (UTRN promoter) (UTRN promoter)

The Utrophin (UTRN) gene promoter and enhancer DNA regions are regulatory sequences that govern the transcription of the UTRN gene, which encodes the utrophin protein (Guiraud et al., 2015). Utrophin is a large cytoskeletal protein that shares significant structural and functional homology with dystrophin, the protein whose absence causes Duchenne muscular dystrophy (DMD) (Wilkinson et al., 2020). While utrophin is primarily localized to the neuromuscular junction in adult muscle, these DNA regulatory elements can be targeted to induce ubiquitous sarcolemmal expression of utrophin (Tinsley et al., 2011). This upregulation serves as a compensatory mechanism, substituting for missing dystrophin to stabilize the muscle membrane and reduce fiber damage (Ricotti et al., 2016). Pharmacological targeting of the UTRN promoter, such as with the small molecule ezutromid, aims to increase utrophin levels regardless of the specific dystrophin mutation (Wilkinson et al., 2020). Despite the promise of this mutation-agnostic approach, clinical trials have faced challenges regarding the durability and magnitude of utrophin induction required for therapeutic benefit (Guiraud et al., 2015).

Other names

UTRN-A promoterUTRN-B promoterUtrophin regulatory elementsUTRN enhancer

Small molecule or genetic activation of the UTRN promoter/enhancer to increase utrophin protein expression, providing functional compensation for missing dystrophin (Guiraud et al., 2015).