FSHD region gene 2 (FRG2)

FSHD region gene 2 (FRG2) refers to a gene family located close to the D4Z4 repeat array on chromosome 4q35 (and homologous loci on chromosome 10).[2] The most studied member, FRG2A, produces a long noncoding RNA (lncRNA), especially in muscle cells. In FSHD (a dominantly inherited muscle-wasting condition), overexpression of FRG2A lncRNA alters heterochromatin 3D structure at the nucleolar periphery and represses rDNA transcription, leading to reduced muscle protein synthesis and contributing to muscle pathology[1]. FRG2A localizes to the nucleolus, is associated with heterochromatin, and is specifically upregulated in FSHD muscle tissue. Unlike canonical target classes (such as receptors or enzymes), FRG2A acts primarily as a regulatory lncRNA scaffold and has no confirmed direct protein-coding function or druggability.[1][2][3] Note: Although historic gene annotations and some aliases may refer to "FRG2 protein" or "FSHD region gene 2 protein," recent data support that the biologically relevant product is a lncRNA, not a functional protein[1][2]. Historically used as a candidate gene in FSHD research, its main pathological significance is now attributed to non-coding RNA function and chromatin regulation. There are currently no direct drug interactions targeting FRG2A, nor a validated therapeutic approach directly engaging this target.

Other names

FRG2FRG2AFSHD region gene 2 proteinprotein FRG2FSHD region gene 2