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J. Biol. Chem., Vol. 276, Issue 26, 23748-23756, June 29, 2001

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Molecular Cloning, Genomic Mapping, and Expression of Two Secretor Blood Group (1,2)Fucosyltransferase Genes Differentially Regulated in Mouse Uterine Epithelium and Gastrointestinal Tract^*

Steven E. Domino^§, Liang Zhang, and John B. Lowe^¶**

From the  Department of Obstetrics and Gynecology, ^¶ Howard Hughes Medical Institute, and the  Department of Pathology, The University of Michigan Medical School, Ann Arbor, Michigan 48109-0650

Fucosylated oligosaccharides have been proposed to be involved in multiple cell-cell interactions, including mouse blastocyst adhesion and intestine-microbe interactions. To begin to define the regulation and function of terminal (1,2)fucosylated carbohydrates in these and other tissues, we isolated and characterized a 85-kilobase (kb) genomic region of mouse chromosome 7, 23.2 centimorgans analogous to human chromosome 19q13.3 that encodes three (1,2)fucosyltransferases. Gene-specific DNA probes from the open reading frames of the mouse fucosyltransferase genes corresponding to human FUT1, FUT2, and SEC1 demonstrate distinct tissue-specific expression patterns by Northern blot analyses. Flow cytometry profiles of cultured cells transfected with DNA segments containing the open reading frames of the mouse genes confirm that each encodes an (1,2)fucosyltransferase. In uterus and colon, a 3.3-kb FUT2 mRNA represents the major fucosyltransferase gene expressed. Steady-state FUT2 mRNA levels are cyclically regulated during the estrus cycle, increasing 10-fold from early diestrus to a relative maximum in proestrus. In contrast, SEC1 and FUT1 do not show prominently regulated expression in uterus. FUT2 expression localizes to luminal uterine epithelium by in situ hybridization, implying that this gene determines expression of cell surface Fuc12Gal epitopes proposed to mediate blastocyst adhesion.

The nucleotide sequence(s) reported in this paper has been submitted to the GenBank^TM/EMBL Data Bank with accession number(s) AF214655, AF214656, AF214657, and AF214658.

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