Localization of cystic fibrosis transmembrane conductance regulator mRNA in the human gastrointestinal tract by in situ hybridization.
We have used in situ hybridization to localize expression of the cystic fibrosis transmembrane conductance regulator (CFTR) gene in the human gastrointestinal tract and associated organs. The stomach exhibits a low level of CFTR expression throughout gastric mucosa. In the small intestine, expression is relatively high in the mucosal epithelium, with a decreasing gradient of expression along the crypt to tip axis. The cells of the Brunner's glands express high levels of CFTR mRNA. In addition, there is a small subpopulation of highly positive cells scattered along the epithelium in the duodenum and jejunum, but not in the ileum. These cells do not represent endocrine cells, as determined by lack of colocalization with an endocrine-specific marker. The distribution of CFTR mRNA in the colon is similar to the small intestine, with highest level of expression in the epithelial cells at the base of the crypts. In the pancreas, CFTR is expressed at high levels in the small, intercalated ducts and at lower levels in the interlobular ducts. CFTR transcripts are expressed at uniformly high levels in the epithelium of the gallbladder. Throughout the gastrointestinal tract, CFTR expression is increased in mucosal epithelial cells that are near lymph nodules.
Strong
T V
TV
Department of Human Genetics, University of Michigan Medical Center, Ann Arbor 48109-0650.
Boehm
K
K
Collins
F S
FS
D016375:Antisense Elements (Genetics); D018118:Chloride Channels / Q000096:biosynthesis; D003106:Colon / Q000378:metabolism*; D003550:Cystic Fibrosis / Q000378:metabolism; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; D004848:Epithelium / Q000378:metabolism; D005753:Gastric Mucosa / Q000378:metabolism*; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007413:Intestinal Mucosa / Q000378:metabolism*; D007421:Intestine, Small / Q000378:metabolism*; D008565:Membrane Proteins / Q000096:biosynthesis*; D015347:RNA Probes; D012333:RNA, Messenger / Q000032:analysis* / Q000096:biosynthesis / Q000378:metabolism
D016375:Antisense Elements (Genetics); C505032:CFTR protein, human; D018118:Chloride Channels; D008565:Membrane Proteins; D015347:RNA Probes; D012333:RNA, Messenger; D019005:Cystic Fibrosis Transmembrane Conductance Regulator