Genetic Disorders Flashcards
What is the defect behind cystic fibrosis (CF)
Mutation of cloride channel protein (CFTR) located on chromosome 7
What is the genetic inheritance of CF?
Autosomal recessive (AR)
What is the genetic inheritance of phenylketouria (PKU)?
AR
What is the genetic inheritance of alkaptonuria?
AR
Examples of glycogen storage disorders?
Type I (von Gierke disease) Type II (Pompe disease) Type V (McArdle syndrome)
What is the genetic inheritance of von Gierke disease?
AR
What is the genetic inheritance of pompe disease?
AR
What is the genetic inheritance of McArdle syndrome?
AR
What is deficient in von Gierke disease?
Glucose-6-phosphatase
What is deficient in pompe disease?
lysosomal alpha-1,4-glucosidase (acid maltase)
What is deficient in McArdle syndrome?
Muscle glycogen phosphorylase
What is the genetic inheritance of Tay-Sachs disease?
AR
Common in Ashkenazi Jews
What is deficient in Tay-Sachs disease?
Hexosaminidase A (due to mutation of HEXA gene on chromosome 15), which leads to the accumulation of GM2 ganglioside in the lysosomes of the CNS and retina.
What is the genetic inheritance of Niemann-Pick disease?
AR
Common in Ashkenzai Jews
What is deficient in Niemann-Pick disease?
Deficiency of sphingomyelinase, which leads to the accumulation of sphingomyelin within the lysosomes of the CNS and reticuloendothelial system