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Enzyme deficiencies & diseases
Step 1 FA2010
61
Medical
Graduate
06/12/2010

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Term
Galactose-1-phosphate uridyltransferase
Definition
Classic galactosemia
Term
Aldolase B
Definition
Fructose intolerance
Term
Fructokinase
Definition
Essential fructosuria
Term
Classic galactosemia
Definition
Failure to thrive, jaundice, hepatomegaly, infantile cataracts, mental retardation
Term
Galactokinase deficiency
Definition
Galactose in blood and urine, infantile cataracts. Initial presentation may include failure to track objects or develop a social smile
Term
Liver, ovaries, seminal vesicles
Definition
Tissues that express BOTH aldose reductase and sorbitol dehydrogenase
Term
Schwann cells, lens, retina, kidneys
Definition
Tissues that have only aldose reductase
Term
Ornithine transcarbamoylase deficiency
Definition
Most common urea cycle disorder
Term
Ornithine transcarbamoylase deficiency
Definition
Orotic acid in blood and urine, low BUN, symptoms of hyperammonemia
Term
HVA
Definition
Breakdown product of dopamine
Term
VMA
Definition
Breakdown product of NE
Term
Metanephrine
Definition
Breakdown product of epinephrine
Term

Penylalanine hydroxylase deficiency

Tetrahydrobipterin cofactor deficiency

Definition
Phenylketonuria
Term
Phenylketonuria
Definition
Mental retardation, growth retardation, seizures, fair skin, eczema, musty body odor
Term
Fabry's disease
Definition
Peripheral neuropathy of hands/feet, angiokeratomas, cardiovascular/renal disease
Term
Alpha-galactosidase A
Definition
Fabry's disease enzyme deficiency
Term
Ceramide trihexoside accumulation
Definition
Fabry's disease
Term
G6PD
Definition
Most common human enzyme deficiency
Term
Cystathionine synthase OR homocysteine methyltransferase
Definition
Deficient enzyme in homocystinuria
Term
Tyrosinase OR defective tyrosine transporters OR failure of neural crest cells to migrate
Definition
Enzyme deficiency in albinism
Term
Homogenistic acid oxidase (tyrosine degradation)
Definition
Enzyme deficiency in alkaptonuria
Term
Homocystinuria
Definition
Marphanoid symptoms + osteoporosis + mental retardation
Term
Renal tubular amino acid transporter
Definition
Enzyme defect in cystinuria
Term

COLA

Cysteine, ornithine, lysine, arginine

Definition
Amino acids not transported in cystinuria
Term
Acetazolamide to alkalinize the urine
Definition
Treatment for cystinuria
Term
Alpha-ketoacid dehydrogenase
Definition
Enzyme deficiency in maple syrup urine disease
Term

I Love Vermont maple syrup from maple trees (with branches)

Blocked degradation of Isoleucine, Leucine, Valine (branched amino acids)

Increased alpha-ketoacids in the blood

Definition
Maple syrup urine disease pathophys
Term
Neutral amino acid transporter on renal and intestinal epithelial cells
Definition
Deficiency in Hartnup disease
Term
Hartnup disease
Definition
Tryptophan excretion in urine and decreased absoprtion from the gut
Term
Hartnup disease
Definition
Can lead to pellagra
Term
Glucose-6-phosphatase
Definition
Enzyme deficient in Von Giercke's disease (type I glycogen storage disease)
Term
Lysosomal alpha-1,4-glucosidase
Definition

Enzyme deficiency in Pompe's disease

(type II glycogen storage disease)

Term
Debranching enzyme (alpha-1,6-glucosidase)
Definition
Enzyme deficiency in Cori's disease (type III glycogen storate disease)
Term
Skeletal muscle glycogen phosphorylase
Definition
Enzyme deficiency in McArdle's disease (type IV glycogen storage disease)
Term
Von Gierke's disease
Definition
Severe fasting hypoglycemia, very high glycogen in liver, high blood lactate, hepatomegaly
Term
Pompe's disease
Definition
Cardiomegaly and systemic findings leading to early death
Term
Cori's disease
Definition
Milder form of type I glycogen storate disase with normal blood lactate levels
Term
McArdle's disease
Definition
Increased glycogen in muscle, but cannot break it down, leading to painful muscle cramps, myoglobinuria with strenous exercise
Term
Gaucher's disease
Definition
Hepatosplenomegaly, aseptic necrosis of femur, bnoe crises
Term
Gaucher's disease
Definition
Most common lysosomal storage disorder
Term
Gaucher's cells
Definition
Macrophages that look like crumpled tissue paper
Term
Beta-glucocerebrosidase
Definition
Enzyme deficiency in Gaucher's disease
Term
Glucocerebrosidase
Definition
Accumulated substrate in Gaucher's disease
Term
Sphingomyelinase
Definition
Enzyme deficiency in Niemann-Pick disease
Term
Sphingomyelin
Definition
Accumulated substrate in Niemann-Pick disease
Term
Niemann-Pick disease
Definition
Progressive neurodegeneration, hepatosplenomegaly, cherry-red spot on macula, foam cells
Term
Hexosaminidase A
Definition
Enzyme deficiency in Tay-Sachs disease
Term
GM2 ganglioside
Definition
Accumulated substrate in Tay-Sachs disease
Term
Tay-Sachs disease
Definition
Progressive neurodegeneration, developmental delay, cherry-red spot on macula, lysosomes with onion skin, no hepatosplenomegaly
Term
Galactocerebrosidase
Definition
Enzyme deficiency in Krabbe's disease
Term
Galactocerebroside
Definition
Accumulated substrate in Krabbe's disease
Term
Krabbe's disease
Definition
Peripheral neuropathy, developmental delay, optic atrophy, globoid cells
Term
Arylsulfatase A
Definition
Enzyme deficiency in metachromatic leukodystrophy
Term
Cerebrosidase sulfate
Definition
Accumulated substrate in metachromatic leukodystrophy
Term
Hurler's syndrome
Definition
Developmental delay, gargolysm, airway obstruction, corneal clouding, hepatosplenomegaly
Term
Metachromatic leukodystrophy
Definition
Central and peripheral demyelineation with ataxia, dementia
Term
Alpha-L-iduronidase
Definition
Enzyme deficiency in Hurler's syndrome
Term
Heparan sulfate, dermatan sulfate
Definition
Accumulated substrates in Hurler's syndrome
Term
Hunter's syndrome
Definition
Mild Hurler's + aggressive behavior, no corneal clouding
Term
Iduronate sulfatase
Definition
Deficient enzyme in Hunter's syndrome
Term
Heparan sulfate and dermatan sulfate
Definition
Accumulated substrate in Hunter's syndrome
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