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In the decomposition of $SO(10)$ grand unification to $SU(5) \timesU(1)_\chi$, two desirable features are obtained with the addition of onecolored fermion octet $\Omega$, one electroweak fermion triplet $\Sigma$ andone complex scalar triplet $S$ to the particle content of the standard modelwith two Higgs doublets. They are (1) gauge coupling unification of $SU(3)_C\times SU(2)_L \times U(1)_Y$ to $SU(5)$, and (2) the automatic (predestined)emergence of dark matter, i.e. $\Omega$, $\Sigma$ and $S$, with dark paritygiven by $(-1)^{Q_\chi + 2j}$. It suggests that $U(1)_\chi$ may well be theunderlying symmetry of the dark sector.

$SO(10) \to SU(5) \times U(1)_\chi$ as the Origin of Dark Matter