Abstract
We discuss the impact of supersymmetric (SUSY) threshold corrections on the values of the running quark and charged lepton masses at the GUT scale within the large tanβ regime of the MSSM. In addition to the typically dominant SUSY QCD contributions for the quarks, we also include the electroweak contributions for quarks and leptons which can have significant effects. We provide the GUT scale ranges of quark and charged lepton Yukawa couplings as well as of the ratios mμ/ms, me/md, yτ/yb and yt/yb for three example ranges of SUSY parameters and discuss how the enlarged ranges due to threshold effects might open up new possibilities for constructing GUT models of fermion masses and mixings. This is a brief summary of the work of Ref. [1].
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