Bare Lymphocyte Syndrome Type I – Immune System and Disorders

Your immune system is a complex network of cells, tissues, and organs that work together to defend against germs. It helps your body to recognize these “foreign” invaders. Then its job is to keep them out, or if it can’t, to find and destroy them.

If your immune system cannot do its job, the results can be serious. Disorders of the immune system include

• Allergy and asthma – immune responses to substances that are usually not harmful
• Immune deficiency diseases – disorders in which the immune system is missing one or more of its parts
• Autoimmune diseases – diseases causing your immune system to attack your own body’s cells and tissues by mistake

NIH: National Institute of Allergy and Infectious Diseases

• Agammaglobulinemia (Medical Encyclopedia)
• Aging changes in immunity (Medical Encyclopedia)
• Chronic granulomatous disease (Medical Encyclopedia)
• Graft-versus-host disease (Medical Encyclopedia)
• Histiocytosis (Medical Encyclopedia)
• Hyperimmunoglobulin E syndrome (Medical Encyclopedia)
• Immune response (Medical Encyclopedia)
• Immunodeficiency disorders (Medical Encyclopedia)
• Selective deficiency of IgA (Medical Encyclopedia)

Bare lymphocyte syndrome type I (BLS I) is an inherited disorder of the immune system (primary immunodeficiency). Immunodeficiencies are conditions in which the immune system is not able to protect the body effectively from foreign invaders such as bacteria or viruses. Starting in childhood, most people with BLS I develop recurrent bacterial infections in the lungs and airways (respiratory tract). These recurrent infections can lead to a condition called bronchiectasis, which damages the passages leading from the windpipe to the lungs (bronchi) and can cause breathing problems.Many people with BLS I also have open sores (ulcers) on their skin, usually on the face, arms, and legs. These ulcers typically develop in adolescence or young adulthood. Some people with BLS I have no symptoms of the condition.People with BLS I have a shortage of specialized immune proteins called major histocompatibility complex (MHC) class I proteins on cells, including infection-fighting white blood cells (lymphocytes), which is where the condition got its name.