By Prof. Harald zur Hausen (auth.)
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Extra info for Current Cancer Research 1986
Whereas the inoculated tumor A "takes", defence cells are produced against this tumor. If one attempts to transfer the tumor for a second time to (operated) animals, the defence reaction prevents "taking" of the tumor. However, defence is restricted to this one tumor; another tumor B "takes" Prof. Gunter Joachim Hammerling Somatic Genetics, Institute of Immunology and Genetics Staff participating Nadja Bulbuc Angelika Hemmerling Daniela Klar Dr. Reiner Wallich In collaboration with Prof. Michael Feldman and Shulamit Katzav Department of Cell Biology, Weizmann Institute of Science Rehovot, Israel Prof.
Nevertheless, the expression of the genetic information of the individual cell types may be very different. Cell differentiation is lastly based on the activity of different genes in different cell types. Only little is known so far about the fundamental mechanisms regulating such genetic programs. However, it is known that the type of packing of DNA with histones and nonhistone proteins to form chromatin plays a major role in gene expression and that the sequence-specific attachment of proteins as regulatory factors to the DNA specifically modulates the activity of the genes.
Bernd Arnold from our Institute of Immunology and Genetics. These cloned H-2 genes were introduced into the defective tumor cells by appropriate transfection methods. Such externally supplied genes are incorporated into the genome of the host cell and frequently also become active. Investigations of the manipulated tumor cells with monoclonal antibodies reveal normal cell Case 1 : Methylcholanthrene A-induced fibrosarcoma IC 9 of the (CBH x C 57 B 1/6)F1 mouse carries only the D but no longer the K histocompatibility molecule.