Patent ID: 9696297
Date: 2017-07-04
CPC Classifications: G01N

Claim:
1. An in vitro method for preparing an X chromosome inactivated female human neuronal cell comprising introducing nucleic acids encoding Oct4, c-Myc, Klf4 and Sox2 proteins into a somatic cell derived from a female human subject with Rett syndrome, wherein the cell comprises a mutated endogenous MeCP2 gene, wherein the nucleic acids are comprised in one or more retroviral vectors, wherein the proteins are expressed by the cell thereby generating an induced pluripotent stem cell (iPSC), culturing the iPSC under human embryonic stem cell (hESC) culture conditions, identifying and isolating an iPSC comprising two active X chromosomes, differentiating the iPSC comprising two active X chromosomes into a neuronal cell in vitro, wherein the neuronal cell exhibits a reduction in the frequency of intracellular calcium transients or the transient rise of intracellular calcium levels, and a decrease in the frequency and amplitude of spontaneous excitatory and inhibitory postsynaptic currents, compared to a control cell without the mutated endogenous MeCP2 gene, wherein upon differentiation one of the two active X chromosomes is inactivated, selecting a neuronal cell comprising an active X chromosome comprising the mutated MeCP2 gene, and determining the neural functionality of the neuronal cell.