Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach
Translocation of mtDNA in the nuclear genome is an ongoing process that contributes to the development of pathological conditions in humans. However, the causal factors of this biological phenomenon in human cells are poorly studied. Here we analyzed mtDNA insertions in the nuclear genome of human l...
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doaj-72c59cc768bf45eb8ad560e2cbac62a22020-11-25T01:59:37ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672020-10-01217690769010.3390/ijms21207690Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic ApproachTigran Harutyunyan0Ahmed Al-Rikabi1Anzhela Sargsyan2Galina Hovhannisyan3Rouben Aroutiounian4Thomas Liehr5Department of Genetics and Cytology, Yerevan State University, Alex Manoogian 1, Yerevan 0025, ArmeniaInstitute of Human Genetics, Jena University Hospital, Friedrich Schiller University, Am Klinikum 1, D-07747 Jena, GermanyDepartment of Genetics and Cytology, Yerevan State University, Alex Manoogian 1, Yerevan 0025, ArmeniaDepartment of Genetics and Cytology, Yerevan State University, Alex Manoogian 1, Yerevan 0025, ArmeniaDepartment of Genetics and Cytology, Yerevan State University, Alex Manoogian 1, Yerevan 0025, ArmeniaInstitute of Human Genetics, Jena University Hospital, Friedrich Schiller University, Am Klinikum 1, D-07747 Jena, GermanyTranslocation of mtDNA in the nuclear genome is an ongoing process that contributes to the development of pathological conditions in humans. However, the causal factors of this biological phenomenon in human cells are poorly studied. Here we analyzed mtDNA insertions in the nuclear genome of human lymphocytes after in vitro treatment with doxorubicin (DOX) using a fluorescence in situ hybridization (FISH) technique. The number of mtDNA insertions positively correlated with the number of DOX-induced micronuclei, suggesting that DOX-induced chromosome breaks contribute to insertion events. Analysis of the odds ratios (OR) revealed that DOX at concentrations of 0.025 and 0.035 µg/mL significantly increases the rate of mtDNA insertions (OR: 3.53 (95% CI: 1.42–8.76, <i>p</i> < 0.05) and 3.02 (95% CI: 1.19–7.62, <i>p</i> < 0.05), respectively). Analysis of the distribution of mtDNA insertions in the genome revealed that DOX-induced mtDNA insertions are more frequent in larger chromosomes, which are more prone to the damaging action of DOX. Overall, our data suggest that DOX-induced chromosome damage can be a causal factor for insertions of mtDNA in the nuclear genome of human lymphocytes. It can be assumed that the impact of a large number of external and internal mutagenic factors contributes significantly to the origin and amount of mtDNA in nuclear genomes.https://www.mdpi.com/1422-0067/21/20/7690CBMN assaydoxorubicinFISHmtDNA insertion in nucleimicronuclei |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tigran Harutyunyan Ahmed Al-Rikabi Anzhela Sargsyan Galina Hovhannisyan Rouben Aroutiounian Thomas Liehr |
spellingShingle |
Tigran Harutyunyan Ahmed Al-Rikabi Anzhela Sargsyan Galina Hovhannisyan Rouben Aroutiounian Thomas Liehr Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach International Journal of Molecular Sciences CBMN assay doxorubicin FISH mtDNA insertion in nuclei micronuclei |
author_facet |
Tigran Harutyunyan Ahmed Al-Rikabi Anzhela Sargsyan Galina Hovhannisyan Rouben Aroutiounian Thomas Liehr |
author_sort |
Tigran Harutyunyan |
title |
Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach |
title_short |
Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach |
title_full |
Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach |
title_fullStr |
Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach |
title_full_unstemmed |
Doxorubicin-Induced Translocation of mtDNA into the Nuclear Genome of Human Lymphocytes Detected Using a Molecular-Cytogenetic Approach |
title_sort |
doxorubicin-induced translocation of mtdna into the nuclear genome of human lymphocytes detected using a molecular-cytogenetic approach |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1661-6596 1422-0067 |
publishDate |
2020-10-01 |
description |
Translocation of mtDNA in the nuclear genome is an ongoing process that contributes to the development of pathological conditions in humans. However, the causal factors of this biological phenomenon in human cells are poorly studied. Here we analyzed mtDNA insertions in the nuclear genome of human lymphocytes after in vitro treatment with doxorubicin (DOX) using a fluorescence in situ hybridization (FISH) technique. The number of mtDNA insertions positively correlated with the number of DOX-induced micronuclei, suggesting that DOX-induced chromosome breaks contribute to insertion events. Analysis of the odds ratios (OR) revealed that DOX at concentrations of 0.025 and 0.035 µg/mL significantly increases the rate of mtDNA insertions (OR: 3.53 (95% CI: 1.42–8.76, <i>p</i> < 0.05) and 3.02 (95% CI: 1.19–7.62, <i>p</i> < 0.05), respectively). Analysis of the distribution of mtDNA insertions in the genome revealed that DOX-induced mtDNA insertions are more frequent in larger chromosomes, which are more prone to the damaging action of DOX. Overall, our data suggest that DOX-induced chromosome damage can be a causal factor for insertions of mtDNA in the nuclear genome of human lymphocytes. It can be assumed that the impact of a large number of external and internal mutagenic factors contributes significantly to the origin and amount of mtDNA in nuclear genomes. |
topic |
CBMN assay doxorubicin FISH mtDNA insertion in nuclei micronuclei |
url |
https://www.mdpi.com/1422-0067/21/20/7690 |
work_keys_str_mv |
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