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Most genes on the X chromosome undergo “inactivation,” being transcribed from only one copy in female somatic cells, but several human genes have been shown to be expressed from both the active and the otherwise inactivated homologue. To assess further the fraction and location of genes that escape inactivation, we have analyzed the inactivation status of a set of 73 expressed sequence tags that were...
Using high-molecular-weight DNA fragments from a human lymphoblastoid cell line, a pilot collection of 2500 YACs was constructed in YKK115, a recombination-deficient strain of Saccharomyces cerevisiae carrying mutations in both the rad51 and rad52 genes. Analysis of 520 clones from the current library by pulsed-field gel electrophoresis revealed more than 97% single YACs with an insert size averaging...
The positioning of Expressed Sequence Tags (ESTs) constitutes an important step towards a functional map of the human genome, including candidate genes for human genetic disorders that have been localized by linkage analysis. We localized 59 ESTs on the human X chromosome, including 44 derived from infant brain and 15 from adult muscle cDNA libraries. Localizations by a somatic cell hybrid panel...
STSs, which have been used to build and format clone contigs, have been used here to assemble a transcriptional map across a cytogenetic band. Of fifty one STSs in Xq28, 20 were positive by RT-PCR. Thus, an additional 20 possible ESTs were detected among the STSs, and seven of these also identified cDNAs in at least one library. The transcripts confirm the high expression level of this region,...
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