Hyperammonemia in MCAD def.

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goal270

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Hi, I read on Wikipedia that there is significant increase in Ammonia levels in blood in MCAD deficiency. Can anyone explain why?

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My guess would be increased utilization of amino acids in the TCA.
 
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My guess would be increased utilization of amino acids in the TCA.

This is right. Because beta-oxidation is messed up in MCAD deficiency, once your glucose/glyocogen stores get used up you need to get those carbon chains to make more glucose and/or ketone bodies from somewhere (amino acids). That increased metabolism of amino acids means those nitrogen waste groups build up because urea cycle can only go so fast.
 
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