Abstract
Sex determination of pure and mixed blood samples and stains was performed by amplification of the X-specific and Y-specific alphoid sequences by PCR (XY-PCR). From mixed blood samples with female DNA present in large excess of male DNA, the Y-specific sequence still amplified efficiently. In the analysis of vaginal secretions in a case of sexual assault, XYPCR was performed to test the efficiency of the selective lysis procedure in order to investigate whether alleles found with other PCR systems were of male or female origin. Our studies with mixed blood samples revealed pronounced DNA competition in the HLA-DQα and D1S80 PCR systems: the alleles from a minor DNA component could not be detected in the presence of a large excess of DNA from a second person.
Zusammenfassung
Für die Geschlechtsbestimmung (XY-PCR) reiner und gemischter Spuren wurden X-spezifische und Y-spezifische Alphoidsequenzen mittels PCR amplifiziert. Aus gemischten Blutproben, wo die Menge an weiblicher DNA viel größer ist als die der männlichen DNA, wurde die Y-spezifische Sequenz immer noch effizient amplifiziert. Bei der Analyse von Spurenmaterial nach einem Sexualdelikt wurde XY-PCR eingesetzt um die Effizienz der selektiven Lyse zu überprüfen und um zu untersuchen, ob Allele, welche in anderen PCR Systemen nachgewiesen wurden, einer weiblichen oder einer männlichen Person zuzuordnen sind. Diese Untersuchungen mit gemischten Blutproben zeigten, daß in den Systemen HLA-DQα und D1S80 starke Kompetition auftrat, wobei die Allele einer DNA, in Anwesenheit eines großen überschuß an DNA einer zweiten Person, nicht mehr nachweisbar waren.
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References
Aasen E, Medrano JF (1990) Amplification of the ZFX and ZFY genes for sex identification in humans, cattle, sheep and goats. Biotechnology 8:1279–1281
Gaensslen RE, Berka KM, Grosso DA, Ruano G, Pagliaro EM, Messina D, Lee HC (1992) A polymerase chain reaction (PCR) method for sex and species determination with novel controls for deoxyribonucleic acid (DNA) template length. J Forensic Sci 37:6–20
Gill P, Jeffreys AJ, Werrett DJ (1985) Forensic applications of DNA fingerprints. Nature 318:577–579
Giusti A, Baird M, Pasquale S, Balasz I, Glassberg J (1987) Application of deoxyribonucleic acid (DNA) polymorphisms to the analysis of DNA recovered from sperm. J Forensic Sci 31: 409–417
He Z-N, Jiang X-H, Lu S-H, Wang G-L, Zhu Y-W, Wang S-W, Shen Y, Gao Q-S, Liu J-Z, Wu G-Y (1989) A study of sex identification of trace, dried bloodstains using a Y-chromosome-specific deoxyribonucleic acid (DNA) probe. J Forensic Sci 34:346–351
Mannucci A, Sullivan KM, Ivanov PL, Gill P (1994) Forensic application of a rapid and quantitative DNA sex test by amplification of the X-Y homologous gene amelogenin. Int J Leg Med 106:190–193
Patri S, Daheron L, Kitzis A, Chomel J-C (1994) Evaluation of bone marrow transplantation efficiency by competitive PCR on Y sequences. PCR Methods Appl. 3:361–364
Pfitzinger H, Ludes B, Mangin P (1993) Sex determination of forensic samples: co-amplification and simultaneous detection of a Y-specific and an X-specific DNA sequence. Int J Leg Med 105:213–216
Pötsch L, Meyer U, Rothschild S, Schneider PM, Ritmer C (1993a) Application of DNA techniques for identification using human dental pulp as a source of DNA. Int J Leg Med 105:139–144
Pötsch L, Prager-Eberle M, Penzes L, Rittner C (1993b) HLADQα-Alpha Typisierung an mikroskopisch spermapositiven Ausstrichpräparaten nach PCR. Rechtsmedizin 3:54–58
Schneider PM, Prager-Eberle M, Rittner C (1991) Zur Anwendung der Polymerase Kettenreaktion (PCR) des HLA-DQα-Alpha Systems in der forensischen Spurenkunde. Arch Kriminol 188:167–174
Sullivan KM, Mannucci A, Kimpton CP, Gill P (1993) A rapid and quantitative DNA sex test: fluorescence-based PCR analysis of X-Y homologous gene amelogenin. Biotechniques 15:636–641
Witt M, Erickson RP (1989) A rapid method for detection of Y-chromosomal DNA from dried blood specimens by the polymerase chain reaction. Hum Genet 82:271–274
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Kreike, J., Lehner, A. Sex determination and DNA competition in the analysis of forensic mixed stains by PCR. Int J Leg Med 107, 235–238 (1995). https://doi.org/10.1007/BF01245480
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DOI: https://doi.org/10.1007/BF01245480