Transient overexpression of mitochondrial transcription factor A (TFAM) is sufficient to stimulate mitochondrial DNA transcription, but not sufficient to increase mtDNA copy number in cultured cells. - Maniura-Weber,K.; Goffart,S.; Garstka,H.L.; Montoya,J.; Wiesner,R.J. (Nucleic Acids Res, 2004)