Expression of the MUC 6 Mucin Gene in Development of the Human Kidney and Male Genital DuctsColm J. Reida and Ann Harrisaa Paediatric Molecular Genetics, Institute of Molecular Medicine, Oxford University, John Radcliffe Hospital, Oxford, United Kingdom Correspondence to: Ann Harris, Paediatric Molecular Genetics, Inst. of Molecular Medicine, Oxford Univ., John Radcliffe Hospital, Oxford, OX3 9DU, UK. The MUC 6 mucin cDNA was isolated from a human stomach cDNA library and has been shown to be expressed in a number of other tissues in the gastrointestinal tract, including the gallbladder, pancreas, and parts of the ileum and colon. Here we establish that MUC 6 is expressed transiently in the nephrogenic zone of the kidney in the early mid-trimester of development. MUC 6 transcripts were detected in the epithelium of ureteric buds at 13 weeks and at lower levels from 17 to 23 weeks of gestation. Traces of MUC 6 mRNA were seen in the collecting ducts but not elsewhere in the developing kidney, and MUC 6 glycoprotein was detected in the epithelium of ureteric buds and collecting ducts. MUC 6 transcripts were absent from adult kidney. This pattern of expression of MUC 6 in the developing kidney suggests a role in epithelial organogenesis. MUC 6 transcripts were also present at low levels in mid-trimester epididymal epithelium. (J Histochem Cytochem 47:817821, 1999) Key Words: MUC 6, mucin, kidney development
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