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Population study would be very interesting. I wonder if the mutation is dominant?
Mutations are not dominant or recessive, alleles are. In this case, it seems to be a recessive allele in that it requires a homozygous recessive to have the full blown syndrome.
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Why mess with HGH when you can change the genes themselves.
Actually, you wouldn't have to mess with the genome for short term effects. All you would have to do is one of three things:
1. Produce a chemical that destroys endogenous myostatin.
2. Produce a chemical that binds to myostatin and prevents it from being effective within muscle.
3. Produce a chemical that binds to myostatin receptors without causing the down-regulation of muscle growth.
Once you have the protein it isn't always necessary to change the DNA sequence.
Also, if the babie's uncles have above average muscle growth it could mean that low levels of myostatin could cause excessive muscle growth. Complete absence may not be needed.