CREB3L2 Gene: Function, Mutations, and Disease Associations | Biomedical SEO

CREB3L2 encodes a member of the CREB3 family of basic leucine zipper (bZIP) transcription factors. It is localized to the endoplasmic reticulum (ER) membrane and is activated by regulated intramembrane proteolysis (RIP) in response to ER stress. Upon cleavage, the N-terminal cytoplasmic domain translocates to the nucleus and activates genes involved in the unfolded protein response (UPR), cell differentiation, and secretion. CREB3L2 is also known as BBF2H7 and is a key regulator of chondrogenesis and osteogenesis. Chromosomal rearrangements involving CREB3L2, particularly the t(7;16)(q34;p11) translocation, result in a FUS-CREB3L2 fusion gene that is a hallmark of low-grade fibromyxoid sarcoma (LGFMS) and sclerosing epithelioid fibrosarcoma (SEF).

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• Unfolded Protein Response (UPR) - CREB3L2 is cleaved by S1P/S2P proteases upon ER stress

• activating target genes.

• ATF6-alpha signaling pathway - CREB3L2 shares mechanistic similarity with ATF6 in ER stress response.

• Chondrocyte differentiation - CREB3L2 regulates genes like Col2a1 and aggrecan during cartilage development.

CREB3L2 is a 520-amino acid transmembrane protein localized to the ER. It contains an N-terminal bZIP domain, a transmembrane domain, and a C-terminal luminal domain. Under ER stress, it undergoes regulated intramembrane proteolysis (RIP) by site-1 and site-2 proteases, releasing the N-terminal fragment that translocates to the nucleus to activate UPR target genes. The protein is essential for chondrogenesis and bone development. In cancer, the FUS-CREB3L2 fusion retains the bZIP domain but loses the transmembrane domain, leading to constitutive nuclear localization and oncogenic activity.