Measurement of transcribed human X-chromosomal DNA sequences transferred to rodent cells by chromosome-mediated gene transfer

Localization of PGI (biglycan, BGN) and PGII (decorin, DCN, PG-40) genes on human chromosomes Xq13-qter and 12q, respectively

The genes for PGI (biglycan, BGN) and PGII (decorin, DCN) have been assigned to human chromosomes X and 12 by Southern analysis of a panel of human-rodent somatic cell hybrid DNAs with cDNA probes for these related small proteoglycans. Regional localization of BGN to Xq13-qter and DCN to 12p12.1-qter was also obtained by examining hybrids containing spontaneous breaks or well-characterized translocations involving chromosomes X and 12. Biglycan (BGN) is a single-copy gene about 6 kb in length. Hybridization with subfragment cDNA probes suggests the presence of two copies of the decorin (DCN) gene, or related sequences, at the locus on chromosome 12, although there is no evidence for function of more than one DCN gene. Efforts to detect restriction fragment length polymorphisms with these probes were unsuccessful.

Rapid and quantitative detection of unique sequence donor DNA in extracts of cultured mammalian cells: an aid to chromosome mapping

A rapid and highly sensitive method for screening the human DNA content of hybrid or transfected mammalian cells is described. Transfectants containing as little as 200 kb of otherwise undefined human DNA can be readily detected in a background of mouse chromatin. At the highest stringency, single-copy sequences can be detected. Large numbers of independent gene-transfer products are easily screened, making the method ideally suited to the identification of rare, but otherwise unselectable, events. The method does not rely upon the expression of the gene sequence of interest; the sole proviso is the availability of an appropriate DNA probe for the chromosomal region or locus of interest.