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Monoclonal gammopathy, also known as paraproteinemia, is the presence of excessive amounts of myeloma protein or monoclonal gamma globulin in the blood. It is usually due to an underlying immunoproliferative disorder or hematologic neoplasms, especially multiple myeloma. It is sometimes considered equivalent to plasma cell dyscrasia.
The immunoglobulin light chain genes in tetrapods can be classified into three distinct groups: kappa (κ), lambda (λ), and sigma (σ). The divergence of the κ, λ, and σ isotypes preceded the radiation of tetrapods. The σ isotype was lost after the evolution of the amphibian lineage and before the emergence of the reptilian lineage.
Serum protein electrophoresis showing a paraprotein (spike/peak in the gamma zone) in a patient with multiple myeloma.. A myeloma protein is an abnormal antibody (immunoglobulin) or (more often) a fragment thereof, such as an immunoglobulin light chain, that is produced in excess by an abnormal monoclonal proliferation of plasma cells, typically in multiple myeloma or Monoclonal gammopathy of ...
Bence Jones proteins are present in 2/3 of multiple myeloma cases. [3] The proteins are immunoglobulin light chains (paraproteins) and are produced by neoplastic plasma cells. They can be kappa (most of the time) or lambda. [3] The light chains can be immunoglobulin fragments or single homogeneous immunoglobulins.
Benign monoclonal gammopathy, monoclonal gammopathy of unknown significance, monoclonal gammopathy of renal significance, [1] unknown or uncertain may be substituted for undetermined: Schematic representation of a normal protein electrophoresis gel. A small spike would be present in the gamma (γ) band in MGUS
Individuals diagnosed with light chain MGUS typically do not express detectable levels of an IgG, IgA, IgD, IgE, or IgM intact myeloma protein in their blood. Rather, they overexpress a monoclonal, aberrant free κ (i.e. kappa) or λ (i.e., lambda) immunoglobulin light chain. For diagnosis, the κ and λ free light chains are quantified by ...