Where do Bence Jones proteins migrate to during urine electrophoresis?

Where do Bence Jones proteins migrate to during urine electrophoresis?

• A. Alpha-1 region
• B. Beta region
• C. Gamma region
• D. Basic region

Answer: (C)

Bence Jones proteins are a type of light chain immunoglobulin found in the urine of patients with certain conditions, primarily multiple myeloma. During urine electrophoresis, these proteins migrate toward the gamma region of the electrophoretic gel. This occurs because Bence Jones proteins are monoclonal light chains (kappa or lambda) that are generally smaller than full immunoglobulin molecules, allowing them to migrate more rapidly, but they still possess enough mass to be categorized within the gamma region.

The gamma region is typically where immunoglobulins are found during electrophoresis. Given that Bence Jones proteins are a distinct product of abnormal plasma cell activity, their presence is often a key indicator of certain hematologic diseases, such as multiple myeloma or Waldenström's macroglobulinemia. Understanding their migration pattern aids in diagnosing these conditions.