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Versican is a major chondroitin sulfate proteoglycan of vascularized connective tissues whose eponym reflects its functional versatility in macromolecular affinity and interactions. In this report we have localized the versican gene (CSPG2) to the long arm of human chromosome 5 by utilizing a combination of somatic cell hybrids, Southern blotting, polymerase chain reaction, and chromosomal in situ hybridization. The proteoglycan gene segregated concordantly with hybrid cell lines containing the long arm of chromosome 5, comprising the 5q12-q14 band regions. To refine this locus further, we screened a chromosome 5-specific library and isolated several genomic clones encoding a portion of the 5' end of versican. One of these genomic clones was used as a probe for in situ hybridization of human chromosome metaphases. The results corroborated the data obtained using somatic cell hybrids and further refined the assignment of the versican gene to the narrow band region of 5q12-5q14, with the primary site likely to be 5q13.2. The availability of novel genomic clones and the mapping data presented here will make possible the identification of any defect genetically linked to this proteoglycan gene.
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