What tissues are affected by Lesch-Nyhan syndrome?
Lesch-Nyhan syndrome is inherited as an X-linked recessive genetic disorder that, with rare female exceptions, most often affects males. The symptoms of Lesch-Nyhan syndrome include impaired kidney function, acute gouty arthritis, and self-mutilating behaviors such as lip and finger biting and/or head banging.
What type of mutation causes Lesch-Nyhan syndrome?
Mutations in the HPRT1 gene cause Lesch-Nyhan syndrome. The HPRT1 gene provides instructions for making an enzyme called hypoxanthine phosphoribosyltransferase 1. This enzyme is responsible for recycling purines , a type of building block of DNA and its chemical cousin RNA.
Why is there megaloblastic anemia in Lesch-Nyhan syndrome?
Lesch Nyhan Disease (LND) is an inherited metabolic disorder caused by deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGprt). This enzyme plays a role in the purine salvage pathway, in which hypoxanthine and guanine are recycled into purine nucleotides.
What is the link between Lesch-Nyhan syndrome and primary gout?
The HGPRT deficiency causes a build-up of uric acid in all body fluids. The combination of increased synthesis and decreased utilization of purines leads to high levels of uric acid production. This results in both high levels of uric acid in the blood and urine, associated with severe gout and kidney problems.
What causes self mutilation in Lesch-Nyhan syndrome?
Serotonin, also a neurotransmitter, has been shown to be regulated by dopamine release in presynaptic channels, and depletion of serotonin will result in high-frequency stimulation, which is seen in Lesch-Nyhan patients. One of the most striking features of LNS is self-mutilative behavior.
What is the mechanism of the hyperuricemia in Lesch-Nyhan syndrome?
Lesch-Nyhan disease (LND) is a rare inherited disorder caused by mutations in the gene encoding hypoxanthine-guanine phosphoribosyltransferase (HPRT). LND is characterized by overproduction of uric acid, leading to gouty arthritis and nephrolithiasis.