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. 2022 Dec 2;13:7414. doi: 10.1038/s41467-022-35199-0

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Schematic diagram of TCA cycle enzymes in regulating epigenetics in the nucleus. b–i Nuclear location of TCA cycle enzymes (green) during the early stages of somatic cell reprogramming with SKOM. Isolated nuclei were stained with antibodies targeting Pdha1 (b), Pcb (c), Aco2 (d), Cs (e), Idh3a (f), Ogdh (g), Sdha (h), or Mdh2 (i) together with Lamin B1 (red) and DAPI (blue). Scale bars, 5 µm. The nuclei/mitochondria (N/M) fluorescent ratio of each TCA cycle enzyme during somatic cell reprogramming with SKOM present in the source files was shown at the lower panel. Data are presented as the mean ± S.D from three independent experiments containing at least 30 cells each. A two-tailed unpaired Student’s t-test was used. j, k, The western blot analysis of PDHA1, PCB, CS, ACO2, and IDH3A in the mitochondria (j) or nucleus (k) during somatic cell reprogramming induced by SKOM. The TOMM20 was used as an indicator of mitochondrial content, while H3 were used as loading controls. l The quantification of PDHA1, PCB, CS, ACO2, and IDH3A in the mitochondria (upper panel) or nucleus (lower panel) are presented on the right. Data are presented as the mean ± S.D and n = 3 independent experiments. A two-tailed unpaired Student’s t test was used.