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EM_Lezione 13.pdf

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Duplicazione genica: perdita di funzione di una delle copie<br />

Ci sono ~7000 malattie genetiche documentate in letteratura che<br />

testimoniano come una mutazione possa distruggere la funzione di<br />

un gene che codifica per una proteina.<br />

PERO’:<br />

“As long as there are other copies of a gene that function normally, a<br />

duplicate gene may accumulate deleterious mutations and become<br />

nonfunctional without adversely affecting the fitness of the<br />

organism.”<br />

J. B. S. Haldane (1933)<br />

“Because deleterious mutations occur far more often than<br />

advantageous ones, a redundant duplicate gene is more likely to<br />

become nonfunctional than to evolve into a new gene.”<br />

Susumu Ohno (1972)

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