Abstract
Our study investigates the mechanisms that regulate early developmental gene expression in Xenopus laevis frog embryos. Our previous study demonstrated that maternal mRNAs of two developmentally significant genes, the nuclear retinoic acid receptor rxrg and the pluripotency factor pou5f3, form complexes with ribonucleoprotein complex Ybx1. Based on the results of the present study, we determined and demonstrated that the stability of the maternal mRNA ssx2ip, which encodes a conserved protein, also called Msd1 or ADIP, which is involved in centrosome maturation, is dependent on Ybx1. This research shows that Ybx1 forms a ribonucleoprotein complex with ssx2ip mRNA, which is mediated by its cold shock domain (CSD). This study confirms our hypothesis of Ybx1 selectively binding to maternal transcripts. It opens up new opportunities to study new mechanisms of gene expression regulation at the earliest stages of development by searching for possible cis-motifs for recognition by trans-regulators such as Ybx1.
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