types:
abetalipoproteinemia
a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels
inborn error of metabolism
any of a number of diseases in which an inherited defect (usually a missing or inadequate enzyme) results in an abnormality of metabolism
mucopolysaccharidosis
any of a group of genetic disorders involving a defect in the metabolism of mucopolysaccharides resulting in greater than normal levels of mucopolysaccharides in tissues
hyperbetalipoproteinemia
a genetic disorder characterized by high levels of beta-lipoproteins and cholesterol; can lead to atherosclerosis at an early age
ichthyosis
any of several congenital diseases in which the skin is dry and scaly like a fish
McArdle's disease
an inherited disease in which abnormal amounts of glycogen accumulate in skeletal muscle; results in weakness and cramping
dystrophy,
muscular dystrophy
any of several hereditary diseases of the muscular system characterized by weakness and wasting of skeletal muscles
oligodactyly
congenital condition in which some fingers or toes are missing
oligodontia
congenital condition in which some of the teeth are missing
otosclerosis
hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness
nevoid elephantiasis,
pachyderma
thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction
porphyria
a genetic abnormality of metabolism causing abdominal pains and mental confusion
diabetes
a polygenic disease characterized by abnormally high glucose levels in the blood; any of several metabolic disorders marked by excessive urination and persistent thirst
galactosemia
a genetic disease (autosomal recessive) in which an enzyme needed to metabolize galactose is deficient or absent; typically develops shortly after birth
malignant hyperthermia
hereditary condition in which certain anesthetics (e.g., halothane) cause high body temperatures and muscle rigidity
Marfan's syndrome
an autosomal dominant disease characterized by elongated bones (especially of limbs and digits) and abnormalities of the eyes and circulatory system
osteogenesis imperfecta
autosomal dominant disorder of connective tissue characterized by brittle bones that fracture easily
Becker muscular dystrophy
a form of muscular dystrophy that sets in in adolescence or adulthood and progresses slowly but will affect all voluntary muscles; characterized by generalized weakness and muscle wasting that affects limb and trunk muscles first; similar to Duchenne's muscular dystrophy but less severe; inheritance is X-linked recessive (carried by females but affecting only males)
distal muscular dystrophy
a form of muscular dystrophy that sets in between 40 and 60 years of age and is characterized by weakness and wasting of the muscles of the hands and forearms and lower legs; inheritance is autosomal dominant
limb-girdle muscular dystrophy
an autosomal recessive form of muscular dystrophy that appears anywhere from late childhood to middle age; characterized by progressive muscular weakness beginning either in the shoulder or pelvic girdle; usually progresses slowly with cardiopulmonary complications in the later stages
lysinemia
an inborn error of metabolism in which the lack of certain enzymes leads to an inability to metabolize the amino acid lysine; characterized by muscular weakness and mental retardation
Steinert's disease,
myotonia atrophica,
myotonic dystrophy,
myotonic muscular dystrophy
a severe form of muscular dystrophy marked by generalized weakness and muscular wasting that affects the face and feet and hands and neck; difficult speech and difficulty with the hands that spreads to the arms and shoulders and legs and hips; the onset can be any time from birth to middle age and the progression is slow; inheritance is autosomal dominant
oculopharyngeal muscular dystrophy
a form of muscular dystrophy that usually begins between early adulthood and middle age and first affects muscles of the eyelid and throat; progresses slowly with swallowing problems common as the disease progresses; inheritance is autosomal dominant
Niemann-Pick disease
a disorder of lipid metabolism that is inherited as an autosomal recessive trait
thrombasthenia
a rare autosomal recessive disease in which the platelets do not produce clots in the normal way and hemorrhage results
tyrosinemia
autosomal recessive defect in tyrosine metabolism resulting in liver and kidney disturbances and mental retardation
Werdnig-Hoffman disease
autosomal recessive disease in which the degeneration of spinal nerve cells and brain nerve cells leads to atrophy of skeletal muscles and flaccid paralysis; death usually occurs in early childhood
pycnodysostosis
a form of dwarfism accompanied by fragile bones and bad teeth
PKU,
phenylketonuria
a genetic disorder of metabolism; lack of the enzyme needed to turn phenylalanine into tyrosine results in an accumulation of phenylalanine in the body fluids which causes various degrees of mental deficiency
xeroderma,
xerodermia
a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin