Does anyone know of an easily transfected cell line that is rich in mitochondria (amendable to mitochondrial study) and not immortal?

I want to generate cell lines expressing specific genetic variants in different genes and measure end points of mitochondrial function as well as senescence, if possible. I have only transfected HEK293 human cell lines before and I hear it is extremely difficult to do so in primary cells however transfecting immortalized cell lines and trying to study senescence is not feasible either. 

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