Homocystinuria is a rare autosomal recessive condition on the RUSP list of conditions screened by newborn genetic testing. The condition results from a mutation that blocks the degradation of the amino acid methionine. The absence of a critical enzyme causes the buildup of the compound homocysteine, which is one of the intermediate compounds in the methionine breakdown pathway. Homocystinuria causes mental impairment, heart problems, seizures, eye abnormalities, and a number of other symptoms that shorten life if not treated. The condition is treated by a specialized diet that is low in methionine and by the ingestion of several supplements.
Why do you think eating a low-methionine diet is critical to controlling homocystinuria?

Question

Homocystinuria is a rare autosomal recessive condition on the RUSP list of conditions screened by newborn genetic testing. The condition results from a mutation that blocks the degradation of the amino acid methionine. The absence of a critical enzyme causes the buildup of the compound homocysteine, which is one of the intermediate compounds in the methionine breakdown pathway. Homocystinuria causes mental impairment, heart problems, seizures, eye abnormalities, and a number of other symptoms that shorten life if not treated. The condition is treated by a specialized diet that is low in methionine and by the ingestion of several supplements.
Why do you think eating a low-methionine diet is critical to controlling homocystinuria?

Why do you think eating a low-methionine diet is critical to controlling homocystinuria?

Accepted Answer

Hey, everyone. Let's take a look at this question together which of the following is a true statement regarding the genetics of him assistant area. So let's recall what we know about him assistant area to figure out which of the following is a true statement. So we know that him Assistant area is a rare genetic disorder that is caused bye, a mutation in one of the enzymes that are responsible or breaking down the amino acid methadone in. And we also know that it is inherited in an autism oh recessive pattern, which means that we need two copies, two develop the disorder. And so now that we know this about him, assistant area, let's try to figure out which of the following is a true statement regarding the genetics of him assistant area. Well, we see that answer choice A says it is a rare Y linked condition which is incorrect because the Y chromosome does not carry the genes that cause him Assistant area. Answer choice B says that it is a rare autism or recessive condition, which we note that it is inherited in that autism or recessive pattern. So therefore, Answer Choice B is a true statement. But let's double check with answer choice C and D. Before we make our selection, answer choice C says that it is the most common excellent dominant condition which we know is incorrect because it is not an excellent dominant condition though it is not answer choice C and answer choice D says that it is a rare X linked recessive condition which is also incorrect because it is not an excellent recessive condition and it is a rare autism, a recessive condition. So answer choice B is a true statement and is the correct answer since we know that Him assistant area is a rare genetic disorder that is caused by a mutation in one of the enzymes responsible for breaking down methadone in and it is inherited and an autism, a recessive pattern. I hope you found this video to be helpful. Thank you and goodbye.

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Key Concepts

Autosomal Recessive Inheritance

Methionine Metabolism and Enzyme Deficiency

Dietary Management in Metabolic Disorders