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Telomere Length in Metaphase Chromosomes of Human Triploid Zygotes
Article

Telomere Length in Chromosomally Normal and Abnormal Miscarriages and Ongoing Pregnancies and Its Association with 5-hydroxymethylcytosine Patterns

1
D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Mendeleevskaya Line 3, 199034 Saint Petersburg, Russia
2
Department of Medical Biophysics, Saint Petersburg State Pediatric Medical University, Litovskaya Street 2, 194100 Saint Petersburg, Russia
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Lidia Larizza
Int. J. Mol. Sci. 2021, 22(12), 6622; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22126622
Received: 13 May 2021 / Revised: 6 June 2021 / Accepted: 18 June 2021 / Published: 21 June 2021
(This article belongs to the Special Issue Structural Variations of the Genome)
The present study investigates telomere length (TL) in dividing chorionic cytotrophoblast cells from karyotypically normal and abnormal first trimester miscarriages and ongoing pregnancies. Using Q-FISH, we measured relative TLs in the metaphase chromosomes of 61 chorionic villous samples. Relative TLs did not differ between karyotypically normal samples from miscarriages and those from ongoing pregnancies (p = 0.3739). However, among the karyotypically abnormal samples, relative TLs were significantly higher in ongoing pregnancies than in miscarriages (p < 0.0001). Relative TLs were also significantly higher in chorion samples from karyotypically abnormal ongoing pregnancies than in those from karyotypically normal ones (p = 0.0018) in contrast to miscarriages, where relative TL values were higher in the karyotypically normal samples (p = 0.002). In the karyotypically abnormal chorionic cytotrophoblast, the TL variance was significantly lower than in any other group (p < 0.05). Assessed by TL ratios between sister chromatids, interchromatid TL asymmetry demonstrated similar patterns across all of the chorion samples (p = 0.22) but significantly exceeded that in PHA-stimulated lymphocytes (p < 0.0001, p = 0.0003). The longer telomere was predominantly present in the hydroxymethylated sister chromatid in chromosomes featuring hemihydroxymethylation (containing 5-hydroxymethylcytosine in only one sister chromatid)—a typical sign of chorionic cytotrophoblast cells. Our results suggest that the phenomena of interchromatid TL asymmetry and its association to 5hmC patterns in chorionic cytotrophoblast, which are potentially linked to telomere lengthening through recombination, are inherent to the development programme. The TL differences in chorionic cytotrophoblast that are associated with karyotype and embryo viability seem to be determined by heredity rather than telomere elongation mechanisms. The inheritance of long telomeres by a karyotypically abnormal embryo promotes his development, whereas TL in karyotypically normal first-trimester embryos does not seem to have a considerable impact on developmental capacity. View Full-Text
Keywords: telomeres; chorionic cytotrophoblast; pregnancy; miscarriage; telomere length; 5-hydroxymethylcytosine; epigenetics; heredity telomeres; chorionic cytotrophoblast; pregnancy; miscarriage; telomere length; 5-hydroxymethylcytosine; epigenetics; heredity
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MDPI and ACS Style

Krapivin, M.I.; Tikhonov, A.V.; Efimova, O.A.; Pendina, A.A.; Smirnova, A.A.; Chiryaeva, O.G.; Talantova, O.E.; Petrova, L.I.; Dudkina, V.S.; Baranov, V.S. Telomere Length in Chromosomally Normal and Abnormal Miscarriages and Ongoing Pregnancies and Its Association with 5-hydroxymethylcytosine Patterns. Int. J. Mol. Sci. 2021, 22, 6622. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22126622

AMA Style

Krapivin MI, Tikhonov AV, Efimova OA, Pendina AA, Smirnova AA, Chiryaeva OG, Talantova OE, Petrova LI, Dudkina VS, Baranov VS. Telomere Length in Chromosomally Normal and Abnormal Miscarriages and Ongoing Pregnancies and Its Association with 5-hydroxymethylcytosine Patterns. International Journal of Molecular Sciences. 2021; 22(12):6622. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22126622

Chicago/Turabian Style

Krapivin, Mikhail I., Andrei V. Tikhonov, Olga A. Efimova, Anna A. Pendina, Anna A. Smirnova, Olga G. Chiryaeva, Olga E. Talantova, Lubov’ I. Petrova, Vera S. Dudkina, and Vladislav S. Baranov 2021. "Telomere Length in Chromosomally Normal and Abnormal Miscarriages and Ongoing Pregnancies and Its Association with 5-hydroxymethylcytosine Patterns" International Journal of Molecular Sciences 22, no. 12: 6622. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22126622

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