Construction and identification of LSD1 overexpression and demethylation disfunction plasmids

Objective To construct rat lysine-specific histone demethylase 1(LSD1) overexpression plasmids and LSD1 demethylation fragment disfunction plasmids, and to evaluate their expression levels in HEK293T cells. Methods LSD1 fragments were amplified by PCR, and LSD1 demethylation disfunction fragments were amplified by overlap PCR. Rat-specific LSD1 overexpression plasmids and LSD1 demethylation disfunction plasmids were constructed and verified by agarose gel electrophoresis and sequencing. HEK293T cells were infected using the validated recombinant plasmids and blank vectors, and the stably expressed cells were selected by puromycin. The expression of LSD1 in the stably expressed HEK293T was detected by Western Blot and real-time quantitative PCR. Results The results of agarose gel electrophoresis and sequencing showed that LSD1 overexpression plasmids and LSD1 demethylation disfunction plasmids were successfully constructed. The Western Blot and real-time quantitative PCR results showed that compared with the blank group, the relative expression of LSD1 and mRNA in the LSD1 overexpression group and the LSD1 demethylation disfunction group were up-regulated, and the differences were statistically significant(all P<0.01). Conclusions The constructed LSD1 overexpression plasmids and LSD1 demethylation disfunction plasmids can achieve overexpression of LSD1 gene in HEK293T cells. This paper lays a foundation for further study of the relationship between LSD1 gene and related diseases and demethylation of LSD1. Key words: Lysine-specific histone demethylase 1; Demethylation; Recombinant plasmid