TY  - JOUR
A1  - Mäueler, Winfried
A1  - Schartl, Angelika
A1  - Schartl, Manfred
T1  - Different expression patterns of oncogenes and proto-oncogenes in hereditary and carcinogen-induced tumors of Xiphophorus
N2  - Hereditary melanoma in Xiphophorus hybrids canying the melanoma·induclng Tu-Sd locus is caused by transcriptional activation of the Xmrk gene that resides at the Tu·Sd locus and encodes a novel member of receptor tyrosine kinases (RTK). ln this study, a total of 17 hereditary melanomas from various hybrid genotypes harbouring 7 different Tu alleles were also found to aver-express the correspondlng Xmrlc alleles. The Ievei of over-expression correlated with the degree of malignancy of the melanoma. ln addition, Xsrc expression was high ln many malignant melanomas. Expression pattems and Ieveis of the Xiphophorus EGF-receptor gene (Xerb B), the c-myc (Xmyc), and the PDGF (Xsls) gene(s) were not intriguing. Transcription of the ras gene(s) may be correlated to secondary events of melanoma progression. Expression pattems of Xfms, the Xiphophorus CSF-1 receptor homologue, can be explained by different contents of infiltrating macrophages in the tumors. ln carcinogen-induced tumors includlng one melanoma no significant expression of the Xmrk oncogene could be detected. Xsrc expression, however, was strikingly high. This indicates that activation of oncogenes other than Xmrk ls instrumental in tumorigenesls of neoplasia of non-hereditary origin.
KW  - Physiologische Chemie
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-61592
ER  - 
TY  - JOUR
A1  - Schartl, Manfred
A1  - Schlupp, Ingo
A1  - Schartl, Angelika
A1  - Meyer, Manfred K.
A1  - Nanda, Indrajit
A1  - Schmid, Michael
A1  - Epplen, Jörg T.
A1  - Parzefall, Jakob
T1  - On the stability of dispensable constituents of the eukaryotic genome: Stability of coding sequences versus truly hypervariable sequences in a clonal vertebrate, the amazon molly, Poecilia formosa
N2  - In dooal unisexual vertebrales, the genes specifying the males become dispensable. To study tbe rate of such geoes the gynogeoetic all-female fisb Poecilillfonnolll was treated with androgens. Phenotypic males were obtained that exbibited the complete set of male cbaracteristics of dosely related gooocboristic species, induding body proportions, pigmentation, the extremely complex insemination apparatus of poecilüd fish, sexual bebavior, and spermatogeoesls. Tbe apparent stabllity of such genic structures, induding those involved in androgen regulation, is contrasted by high instability of noncoding sequeaces. Frequent mutations, thelr donal transmission, and at least two truly hypervariable Iod leading to individual difl'ereaces between these othenrise donal organisms were detected by DNA fingerprinting. These observations substantiate the concept that also in "ameiotic" vertebrates certain compartments of the genome are more prooe to mutatiooal alterations than others.
KW  - Physiologische Chemie
KW  - DNA fingerprinting
KW  - androgen-induced masculinization
KW  - gynogeaesls
KW  - simple repeat sequences
Y1  - 1991
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-61731
ER  - 
TY  - JOUR
A1  - Schartl, Angelika
A1  - Schartl, Manfred
T1  - Genes and cancer: Molecular biology of the melanoma oncogene of Xiphophorus
N2  - No abstract available.
KW  - Schwertkärpfling
KW  - Krebs <Medizin>
Y1  - 1990
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-72670
ER  -