Biotechnologie et biomatériaux

Abstrait

Dictyostelium Genes Dysregulated in an O-Glycosylation Mutant Identified by mRNA Differential Display

Motonobu Yoshida, Naoya Sakuragi, Eiji Tanesaka and Yutaka Sendai

Seven differentially-expressed cDNA clones were isolated by using an mRNA differential display between a Dictyostelium wild-type AX2 and a mutant HG794 defective in O-glycosylation. Transcript levels for the seven clones were reduced or not detectable in the mutant HG794. Homology search showed that the four cDNA clones, DD-3 and DD-7~9 are novel and that three cDNA clones, DD-4 and DD-5, -6 encode an actin-bundling protein and phosphodiesterase inhibitors, respectively. Full-length cDNAs for DD-3 and -8 were isolated and labeled DD3-3 and DD8-14, respectively. DD3-3 consists of 2,166 bp and DD8-14 of 2,084 bp. DD3-3 was preliminarily reported in a previous paper [1]. SSL850 was named a clone by the “Dictyostelium cDNA Project in Japan”, containing a fulllength cDNA for DD-7 and was labeled DD7-1 of 902 bp. It has 60% homology with discoidin Ia. DD8-14 most likely has no direct role in glycosylation, while DD3-3 and DD7-1 very likely are involved in some aspect of recognition of glycosylation.