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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Cysteinová tRNA reguluje proteosyntézu v lidských buněčných liniích / Cysteine tRNA regulates protein synthesis in human cell lines

Kučerová, Michaela January 2021 (has links)
A significant number of known human genetic diseases is associated with nonsense mutations leading to the introduction of a premature termination codon into the coding sequence. A termination codon can be read through by its near-cognate tRNA (tRNA with two anticodon nucleotides base-pairing with a stop codon); potentially generating C-terminally extended protein variants. In yeast, UGA stop codon was described to be read through by tRNA-Trp and tRNA-Cys. Similar was observed for tRNA-Trp in human HEK293T cell line. The aim of this thesis was to investigate if human tRNA-Cys can act as a near-cognate tRNA in human HEK293T cell line. There are two isoacceptors which constitute the tRNA-Cys family, with ACA and GCA anticodon. There are 1 and 23 isodecoders to the ACA and GCA anticodons, respectively. Here, altogether as many as nine tRNA-Cys isodecoders (distinct in their sequence and with varying levels of expression) were tested for their ability to increase UGA readthrough in HEK293T using p2luci and pSGDluc dual-luciferase reporter vectors. In both p2luci and pSGDluc, we observed that at least one tRNA-Cys isodecoder, tRNA-Cys-GCA-4-1, is capable of significantly elevating the UGA readthrough levels when overexpressed in HEK293T. This indicates that similarly to yeast, tRNA-Cys is capable of...

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