We cloned the mouse mannosyltransferase IV/V gene (mALG11) from FM3A cells by a bioinformatic approach. The ORF contained 1476 bp encoding 492 amino acids. The cloned mALG11 complemented the growth defect of the Saccharomyces cerevisiae ALG11Δ mutant. In addition, we detected a variant cDNA by alternate splicing that had an additional four-nucleotide ATGC insertion at base 276 of the ORF. Consequently the variant cDNA encoded a truncated protein with 92 amino acids, lacking the glycosyltransferase group-1 domain. The variant cDNA occurs in many mouse strains according to EST database searches. Moreover, we detected it in FM3A cDNA, but we did not detect any such variants in the human EST database or in HeLa cDNA, although human ALG11 (hALG11) genomic DNA has the same sequence around the intron-exon boundaries as those of mALG11 genomic DNA. Hence, we concluded that there is different transcriptional control mechanism between mALG11 and hALG11.
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