C. Rosenberg et al., ALTERATIONS OF YEAST ARTIFICIAL CHROMOSOME TRANSGENIC SEQUENCES IN STRETCHED EMBRYONIC STEM-CELL CHROMATIN VISUALIZED BY FLUORESCENCE IN-SITU HYBRIDIZATION, Cytogenetics and cell genetics, 75(1), 1996, pp. 67-70
Transgenic mice have been generated from embryonic stem (ES) cells car
rying functional genes cloned within yeast artificial chromosomes (YAC
s). Information on the integrity and organization of the inserted sequ
ences, including the number of copies and their orientation to each ot
her, is still limited by current methods. We have applied fluorescence
in situ hybridization to stretched chromatin preparations from YAC-tr
ansfected ES cells to analyze the organization and copy number of the
integrated sequences.