[DNA profiling as a method of zygosity determination in multiple pregnancy].

The aim of the report was to present a method of zygosity determination in multiple pregnancy. The study wascarried out on same-sex neonates born as a result of spontaneous quadruplet pregnancy. Zygosity was determinedby DNA profiling.

Frequency of streptococcal upper respiratory tract infections and HLA-Cw*06 allele in 70 patients with guttate psoriasis from northern Poland.

Introduction: The association of guttate psoriasis with a streptococcal throat infection and HLA-Cw*06 allele is well established in different populations. Nevertheless, only few studies on this form of disease have been performed in the Polish population.

Aim: To analyze the frequencies of streptococcal-induced guttate psoriasis and HLA-Cw*06 allele in 70 patients with guttate psoriasis originating from northern Poland.

Variation of X-chromosomal microsatellites in Belarus within the context of their genetic diversity in Europe.

More and more X-STR data are becoming available for worldwide human populations for forensic and anthropological investigations, but the European datasets analysed so far represent mainly the central, northern, western and southern part of the continent with populations of Eastern Europe being practically uninvestigated. In the present study, we assessed genetic variation and linkage disequilibrium of 19 X-chromosomal STR markers (DXS7132, DXS7133, DXS7423, DXS7424, DXS8377, DXS8378, DXS9895, DXS10074, DXS10075, DXS10079, DXS10101, DXS10103, DXS10134, DXS10135, DXS10146, DXS10147, DXS10148, GATA172D05, HPRTB) in four regional populations of an Eastern European state of Belarus, including 12 loci incorporated in the Argus X-12 kit. Our results revealed cumulative power of discrimination of the tested X-STR loci to amount to 0.

Northern Slavs from Serbia do not show a founder effect at autosomal and Y-chromosomal STRs and retain their paternal genetic heritage.

Studies on Y-chromosomal markers revealed significant genetic differentiation between Southern and Northern (Western and Eastern) Slavic populations. The northern Serbian region of Vojvodina is inhabited by Southern Slavic Serbian majority and, inter alia, Western Slavic (Slovak) and Eastern Slavic (Ruthenian) minorities. In the study, 15 autosomal STR markers were analysed in unrelated Slovaks, Ruthenians and Serbs from northern Serbia and western Slovakia.

[Identification of a novel Y-SNP in the USP9Y gene and its impact on genotyping alleles of the M46 locus].

Y-chromosomal SNP markers are becoming increasingly more popular among forensic geneticists, but since they constitute variants specific to the ethnic origin, detailed population studies are required. Research into frequency of haplogroup N-M46 in the Belarusian population detected a mutated allele in 22 males, including one with a very distinct Y-STR haplotype. Sequencing of the M46 locus of this individual revealed the presence of a novel Y-SNP nearby the M46 locus, which was responsible for the erroneous assignment of the Y chromosome to the haplogroup N-M46.