What Is A Clone Number

In the realm of biological research, the ability to accurately characterize and reproduce specific biological entities is of paramount importance. Clone numbers play a crucial role in this process, enabling scientists to identify and track individual clones with precision.

Nomenclature of Monoclonal Antibodies

The nomenclature of monoclonal antibodies plays a vital role in ensuring effective communication, patient safety, and regulatory compliance in the field of biotechnology and medicine. The nomenclature of monoclonal antibodies consists of several components that provide information about the antibody's structure, target, and origin.

• Stem
  The stem is a crucial part of the antibody's name and provides information about its structure and function. Until 2021, the stem "-mab" was used for all monoclonal antibodies and their fragments. However, a new scheme introduced in 2021 divided antibodies into four groups, each assigned a different stem. Group 1 uses the stem "-tug" for full-length unmodified immunoglobulins, while Group 2 uses "-bart" for full-length antibodies with engineered regions. Group 3 employs "-mig" for multi-immunoglobulins, and Group 4 uses "-ment" for monospecific antibody fragments without an Fc region.
• Substem for Source
  The substem preceding the stem indicates the animal or source from which the antibody was obtained. For example, antibodies produced in mice were denoted by the substem "-o-" and ended with "-omab". To address potential immune reactions in humans, various strategies were developed, such as replacing parts of the antibody with human amino acid sequences. This led to the use of substems like "-xi-" for chimeric antibodies and "-zu-" for humanized antibodies.
• Substem for Target
  The substem preceding the source represents the target or therapeutic area of the antibody. Different substems are used to indicate specific target classes. For instance, substems like "-ci(r)- " are used for the circulatory system, "-ne(r)-" for the nervous system, and " -li(m)- " for the immune system. This allows researchers and healthcare professionals to quickly identify the intended therapeutic application of a monoclonal antibody.
• Prefix
  The prefix in the antibody's name serves to distinguish antibodies with the same source and target substems. It carries no special meaning but aids in differentiating between different products. For example, antibodies targeting the same cardiovascular area but with different chemical structures can be differentiated using unique prefixes.
• Additional Words
  In some cases, an additional word follows the antibody's name to indicate the attachment of another substance or modification. This can include polyethylene glycol (PEG) or cytotoxic agents. These modifications serve specific purposes, such as prolonging the antibody's half-life or enhancing its therapeutic efficacy against cancer cells.