Deficiency, ankyrin
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  Deficiency, ankyrin



Deficiency, ankyrin

   Known also as hereditary spherocytosis (HS), this is a genetic disorder of the red blood cell membrane clinically characterized by anemia, jaundice (yellowing) and splenomegaly (enlargement of the spleen), due to deficiency of ankyrin, a protein in the membrane of the red cell.

RELATED TERMS
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Hereditary
Transmitted from parent to offspring; derived from ancestry.

Genetic
Hereditary. Having to do with the genes.

Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.

Cell
Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.

Membrane
A flexible layer surrounding a cell, organelle (such as the nucleus), or other bodily structure. The movement of molecules across a membrane is strictly regulated in both directions.

Anemia
Anemia is a condition in which a deficiency in the size or number of erythrocytes (red blood cells) or the amount of hemoglobin they contain limits the exchange of oxygen and carbon dioxide between the blood and the tissue cells. Most anemias are caused by a lack of nutrients required for normal erythrocyte synthesis, principally iron, vitamin B-12, and folic acid. Others result from a variety of conditions, such as hemorrhage, genetic abnormalities, chronic disease states or drug toxicity.

Jaundice
A condition in which the skin and the whites of the eyes become yellow, urine darkens, and the color of stool becomes lighter than normal. Jaundice occurs when the liver is not working properly or when a bile duct is blocked.

Splenomegaly
Enlargement of the spleen.

Protein
Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur, the characteristic element being nitrogen. Proteins, the principal constituents of the protoplasm of all cells, are of high molecular weight and consist essentially of combinations of a-amino acids in peptide linkages. Twenty different amino acids are commonly found in proteins, and each protein has a unique genetically defined amino acid sequence which determines its specific shape and function. Their roles include enzymatic catalysis, transport and storage, coordinated motion, nerve impulse generation and many others.



SIMILAR TERMS
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Defiance Regional Medical Center
The Defiance Regional Medical Center is a hospital in Defiance, Ohio, United States.

Defibrillation
The use of a carefully controlled electric shock, administered either through a device on the exterior of the chest wall or directly to the exposed heart muscle, to restart or normalize heart rhythms.

Defibrillator
An electronic device used to establish normal heartbeat.

Defibrillator, implantable cardiac
A device put within the body that is designed to recognize certain types of abnormal heart rhythms (arrhythmias) and correct them.

Deficiency diseases
Any disorder caused by a lack of essential nutrients.

Deficiency, adenosine deaminase (ADA)
A genetic (inherited) condition that results in a immune deficiency disorder called severe combined immunodeficiency disease. Adenosine deaminase is an enzyme that plays a key role in salvaging purine molecules.

Deficiency, ceruloplasmin
Lack of the protein ceruloplasmin from the blood and accumulation of iron in the pancreas, liver and brain, causing diabetes and progressive nervous system degeneration with the tremors and gait abnormalities characteristic of Parkinson disease. Ceruloplasmin deficiency is agenetic condition, also known as aceruloplasminemia.

Deficiency, FALDH
Also known as the Sjogren-Larsson syndrome, this is a genetic (inherited) disease usually characterized by a triad of clinical findings consisting of ichthyosis (thickened fish-like skin), spastic paraplegia (spasticity of the legs) and mental retardation.

Deficiency, GALT
Lack of the enzyme called GALT (galactose-1-phosphate uridyl transferase) which causes the genetic metabolic disease galactosemia, one of the diseases in many newborn screening panels. The disease can be fatal, if undetected. If detected, it can be treated by avoiding galactose in the diet.

Deficiency, glucocerebrosidase
Causes type 1 Gaucher disease, a progressive genetic disease due to an enzyme defect. The enzyme, glucocerebrosidase, is needed to break down the chemical glucocerebroside. The enzyme defect leads to the progressive accumulation of glucocerebroside in the spleen, liver, and lymph nodes.

Deficiency, glucose-6-phosphate dehydrogenase
Deficiency of G6PD is the commonest disease-causing enzyme defect in humans affecting an estimated 400 million people. The G6PD gene is on the X chromosome. Males with the enzyme deficiency develop anemia due to breakup of their red blood cells when they are exposed to oxidant drugs such as the antimalarial primaquine, the sulfonamide antibiotics or sulfones, naphthalene moth balls, or fava beans.

Deficiency, iron
The most common known form of nutritional disorder in the world, iron deficiency results in anemia because iron is necessary to make hemoglobin, key molecule in red blood cells responsible for the transport of oxygen. In iron deficiency anemia, the red cells appear abnormal and are unusually small (microcytic) and pale (hypochromic). The pallor of the red cells reflects their low hemoglobin content.

Deficiency, lactase
Not enough of an enzyme called lactase in the small intestine to digest lactose, a prominent component of milk and most other dairy products. Lactose is sometimes also used as an ingredient in other foods, so anyone with lactase deficiency should check food labels with care.

Deficiency, LCHAD
Acute fatty liver of pregnancy (AFLP) has been found to be associated in some cases with an abnormality of fatty-acid metabolism. This abnormality is a deficiency of the enzyme long-chain-3-hydroxyacyl-CoA dehydrogenease (LCHAD).

Deficiency, magnesium
Can occur due to inadequate intake or impaired intestinal absorption of magnesium. Low magnesium (hypomagnesemia) is often associated with low calcium (hypocalcemia) and potassium (hypokalemia) levels. Deficiency of magnesium causes increased irritability of the nervous system with tetany (spasms of the hands and feet, muscular twitching and cramps, spasm of the larynx, etc.).

Deficiency, protein C
Protein C is a protein in plasma that enters into the cascade of biochemical events leading to the formation of a clot. Deficiency of protein C results in thrombotic (clotting) disease.

Deficiency, selenium
Lack of the essential mineral selenium, which can cause Keshan disease, a fatal form of cardiomyopathy (disease of the heart muscle) that was first observed in Keshan province in China and has since found elsewhere. Treatment involves ensuring adequate selenium. The recommended dietary allowance (RDA) is currently 55 micrograms of selenium per day for adult men and women, 60 micrograms per day for women during pregnancy and 70 micrograms per day for women during lactation. Food sources of selenium include seafoods, some meats such as kidney and liver, and some grains and seeds.

Deficiency, sphingomyelinase
Also called Niemann-Pick disease, this is a disorder of the metabolism of a lipid (fat) called sphingomyelin that usually causes the progressive development of enlargement of the liver and spleen (hepatosplenomegaly), "swollen glands" (lymphadenopathy), anemia and mental and physical deterioration.

Deficiency, UDP-glucuronosyltransferase
Underactivity of a liver enzyme that is essential to the disposal of bilirubin (the chemical that results from the normal breakdown of hemoglobin from red blood cells).

Deficiency, zinc
According to the National Academy of Sciences, the Recommended Dietary Allowances of zinc are 12 milligrams per day for women and 10 milligrams per day for men. Food sources of zinc include meat including liver, eggs, seafood, nuts and cereal.

Definity
Definity is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): perflutren .



PREVIOUS AND NEXT TERMS
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Defensin
A family of potent antibiotics made within the body by neutrophils (a type of white blood cell) and macrophages (cells that can engulf foreign particles). The defensins play important roles against invading microbes. They act against bacteria, fungi and viruses by binding to their membranes and increasing membrane permeability. On a chemical level, the defensins are small peptides unusually rich in the amino acid cysteine (Cys).The human defensins are classified into the alpha-defensins and beta-defensins on the basis of their sequence homology and their Cys residues.

Defensive medicine
Medical practices designed to avert the future possibility of malpractice suits. In defensive medicine, responses are undertaken primarily to avoid liability rather than to benefit the patient. Doctors may order tests, procedures, or visits, or avoid high-risk patients or procedures primarily (but not necessarily solely) to reduce their exposure to malpractice liability. Defensive medicine is one of the least desirable effects of the rise in medical litigation. Defensive medicine increases the cost of health care and may expose patients to unnecessary risks.

Defibrillation
The use of a carefully controlled electric shock, administered either through a device on the exterior of the chest wall or directly to the exposed heart muscle, to restart or normalize heart rhythms.

Defibrillator, implantable cardiac
A device put within the body that is designed to recognize certain types of abnormal heart rhythms (arrhythmias) and correct them.

Deficiency, adenosine deaminase (ADA)
A genetic (inherited) condition that results in a immune deficiency disorder called severe combined immunodeficiency disease. Adenosine deaminase is an enzyme that plays a key role in salvaging purine molecules.

Deficiency, ankyrin

Deficiency, ceruloplasmin
Lack of the protein ceruloplasmin from the blood and accumulation of iron in the pancreas, liver and brain, causing diabetes and progressive nervous system degeneration with the tremors and gait abnormalities characteristic of Parkinson disease. Ceruloplasmin deficiency is agenetic condition, also known as aceruloplasminemia.

Deficiency, FALDH
Also known as the Sjogren-Larsson syndrome, this is a genetic (inherited) disease usually characterized by a triad of clinical findings consisting of ichthyosis (thickened fish-like skin), spastic paraplegia (spasticity of the legs) and mental retardation.

Deficiency, GALT
Lack of the enzyme called GALT (galactose-1-phosphate uridyl transferase) which causes the genetic metabolic disease galactosemia, one of the diseases in many newborn screening panels. The disease can be fatal, if undetected. If detected, it can be treated by avoiding galactose in the diet.

Deficiency, glucocerebrosidase
Causes type 1 Gaucher disease, a progressive genetic disease due to an enzyme defect. The enzyme, glucocerebrosidase, is needed to break down the chemical glucocerebroside. The enzyme defect leads to the progressive accumulation of glucocerebroside in the spleen, liver, and lymph nodes.

Deficiency, glucose-6-phosphate dehydrogenase
Deficiency of G6PD is the commonest disease-causing enzyme defect in humans affecting an estimated 400 million people. The G6PD gene is on the X chromosome. Males with the enzyme deficiency develop anemia due to breakup of their red blood cells when they are exposed to oxidant drugs such as the antimalarial primaquine, the sulfonamide antibiotics or sulfones, naphthalene moth balls, or fava beans.

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