Mostafa T, et al. - As a part of this research, experts contemplated the expressed seminal NAD-dependent protein deacetylase (SIRT1) expression in infertile oligoasthenoteratozoospermic (OAT) men associated with varicocoele. It was demonstrated that seminal SIRT1 expression appeared to be prominently decreased in infertile OAT men in general and in infertile OAT men associated with varicocoele, in particular.