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Detection of somatic changes in human renal cell carcinomas with oligonucleotide probes specific for simple repeat
S Bock1, J T Epplen, H Noll-Puchta
1Institut für klinische Hämatologie, Forschungszentrum für Umwelt und Gesundheit GmbH, Hämatologikum, München, Germany.
Abstract:
The purpose of our study was to detect somatic changes in renal cell carcinoma by multilocus fingerprinting. DNA fingerprints were generated from the DNA of normal and malignant renal tissue samples of 29 patients with nonhereditary kidney carcinoma by using oligonucleotide probes specific for simple repeat motifs such as (GTG)5, (CA)8, (GACA)4, or (TTAGGG)3. Each probe rendered a typical fingerprint pattern, because it is specific with respect to the target regions recognized in the genome. The restriction enzymes used were HinfI and HaeIII. Changed banding patterns were detected by using (GTG)5 in 20% of the tumors, in 20% for (CA)8 after HinfI digestion, and in 10% after HaeIII digestion. Even more informative probes were (GACA)4, showing 70% changes after HaeIII digestion, and (TTAGGG)3, with 80% changes after digestion with either enzyme. Since the simple repeat motifs recognized by (GACA)4 are localized on the short arms of the acrocentric chromosomes (13, 14, 15, 21, and 22), it is possible that sequences important for renal carcinogenesis are present in these regions. The observation of changes in regions to which (TTAGGG)3 hybridizes points to an involvement of DNA elements in telomeric sequence related regions in human kidney tumor formation.
Insights
This study used DNA fingerprinting to detect somatic changes in kidney cancer. Simple repeat probes revealed significant alterations in 80% of tumors, highlighting potential cancer-related genetic regions.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Renal cell carcinoma (RCC) is a significant health concern.
- Understanding the genetic basis of nonhereditary kidney cancer is crucial for developing targeted therapies.
- Somatic mutations play a key role in tumor development.
Purpose of the Study:
- To investigate somatic DNA alterations in nonhereditary renal cell carcinoma.
- To employ multilocus fingerprinting to detect genomic changes.
- To identify specific DNA regions involved in kidney carcinogenesis.
Main Methods:
- DNA was extracted from normal and malignant renal tissue of 29 patients.
- Multilocus fingerprinting was performed using oligonucleotide probes for simple repeat motifs: (GTG)5, (CA)8, (GACA)4, and (TTAGGG)3.
- Restriction enzymes HinfI and HaeIII were used for DNA digestion, followed by Southern blot analysis.
Main Results:
- Significant changes in DNA banding patterns were observed.
- (GTG)5 detected changes in 20% of tumors.
- (CA)8 showed 20% changes with HinfI and 10% with HaeIII.
- (GACA)4 revealed 70% changes after HaeIII digestion.
- (TTAGGG)3 identified 80% changes with either enzyme, suggesting involvement of telomeric regions.
Conclusions:
- Multilocus fingerprinting effectively detects somatic changes in renal cell carcinoma.
- The probe (TTAGGG)3 is highly informative, indicating involvement of telomeric regions in kidney tumor formation.
- The probe (GACA)4 highlights potential cancer-related sequences on acrocentric chromosomes (13, 14, 15, 21, 22).