Immunoglobulin heavy joining 4 (IGHJ4)

Immunoglobulin heavy joining 4 (IGHJ4) is a germline gene segment in the human immunoglobulin heavy chain (IGH) locus that encodes one of the joining (J) regions involved in antibody (immunoglobulin) gene rearrangement[5][1]. During B cell development, IGHJ4 can be recombined with one variable (IGHV) and one diversity (IGHD) segment in a process called V(D)J recombination, which generates the variable region of immunoglobulin heavy chains and thus contributes to the immense diversity of antibodies imperative for the adaptive immune response[1][4]. There are multiple IGHJ segments (including IGHJ4), and the usage of particular J segments is part of the clonal signature of B cells. IGHJ4 itself is not a protein nor a receptor, but a segment used in the assembly of immunoglobulin genes. While not a therapeutic target, IGHJ region sequences are commonly used as molecular markers for clonal tracking, most notably in leukemia minimal residual disease (MRD) assessment, where the unique IGH rearrangement can identify and monitor malignant B cell populations[2][5]. IGHJ4 does not serve as a direct target for drugs, nor does it have known ligand or drug interactions.

Other names

JH4bIGHJ4

None applicable (this gene segment is not directly drugged)