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The human CD44 cell surface glycoprotein family which has been implicated in lymphocyte homing, tumor metastasis, and extracellular matrix attachment consists of a large number of related isoforms that derive from the differential splicing of a single CD44 gene transcript. Recent mapping of the CD44 locus in man indicated the presence of at least nine alternative exons within the region of the gene encoding the variable membrane proximal extracellular domain. Here we report the identification of a 10th alternative exon (termed V1) in the mouse, human, and rat CD44 genes. We demonstrate tissue-specific patterns of expression for transcripts containing exons V1-V10 in the mouse and a highly restricted usage of exon V1 in transcripts from mouse gastric tissue. Close sequence homology between exons V1-V10 from mouse rat and human points to a specific functional role rather than a purely structural role for the membrane proximal extracellular domain of the CD44 molecule.

Type

Journal article

Journal

J Biol Chem

Publication Date

15/06/1993

Volume

268

Pages

12235 - 12238

Keywords

Alternative Splicing, Amino Acid Sequence, Animals, Base Sequence, Codon, Exons, Humans, Mice, Molecular Probes, Molecular Sequence Data, Oligodeoxyribonucleotides, Polymerase Chain Reaction, RNA, Messenger, Rats, Receptors, Lymphocyte Homing, Sequence Homology, Amino Acid, Sequence Homology, Nucleic Acid, Transcription, Genetic