X-linked acrogigantism (X-LAG) is a condition that causes abnormally fast growth beginning early in life. Babies with this condition are a normal size at birth but begin to grow rapidly in infancy or early childhood, and affected children are taller READ MORE

X-linked adrenal hypoplasia congenita is a disorder that is noticeable from birth (congenital) and affects the development of the adrenal glands, which are hormone-producing (endocrine) organs (glands) located on top of each kidney. These glands prod READ MORE

X-linked adrenoleukodystrophy is a genetic disorder that mainly affects the nervous system and the adrenal glands, which are located on top of each kidney. In this disorder, the fatty covering (myelin) that insulates nerves in the brain and spinal co READ MORE

X-linked agammaglobulinemia (XLA) is a condition that affects the immune system and occurs almost exclusively in males. It is part of a group of disorders called primary immunodeficiencies (or inborn errors of immunity), in which part of the immune s READ MORE

X-linked cardiac valvular dysplasia is a condition characterized by the abnormal development (dysplasia) of heart (cardiac) valves. The normal heart has four valves, two on the left side of the heart and two on the right side, that allow blood to mov READ MORE

X-linked chondrodysplasia punctata 1 is a disorder of cartilage and bone development that occurs almost exclusively in males. Chondrodysplasia punctata is an abnormality that appears on x-rays as spots (stippling) near the ends of bones and in cartil READ MORE

X-linked chondrodysplasia punctata 2 is a disorder characterized by bone, skin, and eye abnormalities. It occurs almost exclusively in females. Although the signs and symptoms of this condition vary widely, almost all affected individuals have chondr READ MORE

X-linked congenital stationary night blindness is a disorder of the retina, which is a specialized tissue at the back of the eye that detects light and color. People with this condition typically have difficulty seeing in low light (night blindness). READ MORE

X-linked creatine deficiency is an inherited disorder that primarily affects the brain. People with this disorder have intellectual disability, which can range from mild to severe, and delayed speech development. Some affected individuals develop beh READ MORE

X-linked dilated cardiomyopathy is a form of heart disease. Dilated cardiomyopathy enlarges and weakens the heart (cardiac) muscle, preventing the heart from pumping blood efficiently. Signs and symptoms of this condition can include an irregular hea READ MORE

X-linked dystonia-parkinsonism is a movement disorder that has been found only in people of Filipino descent. This condition affects men much more often than women. Parkinsonism is usually the first sign of X-linked dystonia-parkinsonism. Parkinsonis READ MORE

X-linked hyper IgM syndrome is a condition that affects the immune system and occurs almost exclusively in males. People with this disorder have abnormal levels of proteins called antibodies or immunoglobulins. Antibodies help protect the body agains READ MORE