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Telomere lengthening by trichostatin A treatment in cloned pigs

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  • 1. Laboratory of Embryo Biotechnology, College of life science, Northeast Agricultural University, Harbin 150030, China 2. Laboratory for Stem Cells and Developmental Biology, College of Life Sciences, Nankai University, Tianjin 300192, China

Received date: 2012-04-01

  Revised date: 2012-05-18

  Online published: 2012-12-14

Abstract

Telomeres are repeated GC rich sequences at the end of chromosomes, and shorten with each cell division due to DNA end replication problem. Previously, reprogrammed somatic cells of cloned animals display variable telomere elongation. However, it was reported that the cloned animals including Dolly do not reset telomeres and show premature aging. In this study, we investigated telomere function in cloned or transgenic cloned pigs, including the cloned Northeast Min pigs, eGFP, Mx, and PGC1α transgenic cloned pigs, and found that the telomere lengths of cloned pigs were significantly shorter than the nuclear donor adult fibroblasts and age-matched noncloned pigs (P<0.05), indicating that nuclear reprogramming did not restore cellular age of donor cells after somatic cell nuclear transfer (SCNT). Trichostatin A (TSA), an inhibitor of histone deacetylase, has proven to enhance the efficiency of nuclear reprogramming in several species. In order to test whether TSA also can effectively enhance reprogramming of telomeres, TSA (40 nmol/L) was used to treat porcine cloned embryos at 1-cell stage for 24 h. Consistent with previous reports, the developmental rate of SCNT embryos to the blastocyst stage was significantly increased compared with those of the control group (16.35% vs. 27.09%, 21.60% vs. 34.90%, P<0.05). Notably, the telomere length of cloned porcine blastocysts was also significantly elongated (P<0.05). Although TSA did not improve the cloning efficiency (1.3% vs. 1.7%, TSA vs. control), the telomere lengths of cloned piglets were significantly longer compared with those of the control group and the donor fibroblasts (P<0.05). In conclusion, telomeres have not been effectively restored by SCNT in pigs but TSA can effectively lengthen the telomere lengths of cloned pigs.

Key words: pig; cloning; reprogramming; telomere; TSA

Cite this article

XIE Bing-Teng, JI Guang-Zhen, KONG Qing-Ran, MAO Jian SHI Yong-Qian LIU Shi-Chao WU Mei-Ling WANG Juan LIU Lin LIU Zhong-Hua . Telomere lengthening by trichostatin A treatment in cloned pigs[J]. Hereditas(Beijing), 2012 , 34(12) : 1583 -1590 . DOI: 10.3724/SP.J.1005.2012.01583

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