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Molecular cloning, cDNA sequence, and chromosomal assignment of the human radixin gene and two dispersed pseudogenes.

Wilgenbus K.K., Milatovich A., Francke U., Furthmayr H.

Radixin is a cytoskeletal protein that may be important in linking actin to the plasma membrane. Recent cloning of the murine and porcine radixin cDNAs revealed a protein highly homologous to ezrin and moesin. We have cloned and sequenced the human radixin cDNA and found the predicted amino acid sequence for the human protein to be nearly identical to those predicted for radixin in the two other species. By Southern analyses of Chinese hamster x human somatic cell hybrid DNA and of PCR products derived from hybrids, the coding gene (RDX) was mapped to 11q. Fluorescence chromosomal in situ hybridization with a cDNA plasmid further localized this gene to band 11q23. However, PCR amplification with "radixin-specific" primers on the hybrid DNA panel yielded an additional, very similar DNA sequence that was further characterized by direct sequencing of PCR products. This sequence represents a truncated version and the respective locus (RDXP2) was assigned to Xp21.3. Furthermore, by employing a different set of primers, a third sequence was found that was 90% identical to the radixin sequence but contained termination codons and seemed to lack introns. This pseudogene (RDXP1) was mapped to 11p by Southern and PCR analyses.

Genomics 16:199-206(1993) [PubMed] [Europe PMC]

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