HNRNPUL2-BSCL2 readthrough (HNRNPUL2-BSCL2)

HNRNPUL2-BSCL2 readthrough is a non-coding RNA generated by read-through transcription between HNRNPUL2 and BSCL2 on chromosome 11q12.3. It is classified as a nonsense-mediated mRNA decay (NMD) candidate, meaning the transcript is typically degraded and does not produce a protein product[1][3][5]. The biological significance of this readthrough transcript remains unclear, as most evidence indicates it serves no direct biological function. Its neighboring genes, however, encode important proteins: HNRNPUL2 is an RNA-binding protein involved in mRNA splicing, while BSCL2 encodes seipin, a membrane protein critical for lipid droplet formation and associated with severe genetic disorders when mutated[8][3]. This is not a standard therapeutic target and does not encode a protein nor fulfill a direct cellular role[1][3][5]. Its name appears in genetic variant listings because of its chromosomal context and read-through nature, not due to established involvement in disease or drug action. Any therapeutic targeting would pertain to parental genes, especially BSCL2, not the readthrough itself. HNRNPUL2-BSCL2 readthrough does not have a canonical function, protein product, or established role as a drug target. It should not be conflated with its component protein-coding genes, which are clinically relevant[3][8]. HNRNPUL2-BSCL2 readthrough is a non-coding, likely non-functional, transcript and is not a recognized molecular target for therapy or drug development[1][3][5]. Its clinical importance lies solely in the context of the neighboring protein-coding BSCL2 and HNRNPUL2 genes.