Forensic Efficiency Parameters Research Articles

Genetic characterization of 52 autosomal SNPs in two sub-Saharan African populations

Population data regarding autosomal single nucleotide polymorphisms (SNPs) variation in African populations are very limited. The aim of this work was to provide enhanced sampling and a more representative coverage of the African continent. We studied two sub-Saharan African populations (Uganda and Angola) using the SNP forID 52-plex assay. Allele frequencies, observed heterozygosity, discrimination power and genetic distance ( F ST) between populations are reported for all markers. Comparisons revealed a low but significant genetic distance between the two populations. No significant deviations from Hardy–Weinberg equilibrium or associations between loci were detected. The forensic efficiency parameters highlight the potential of the SNP forID multiplex for identification purposes also in African populations.

Population genetics of 15 autosomal STR loci in the population of Pomorze Zachodnie (NW Poland)

Allele frequency data and forensic efficiency parameters for 15 STR loci: D8S1179, D21S11, D7S820, CSF1PO, D3S1358, TH01, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, D5S818, FGA were estimated from a sample of 600 unrelated individuals from the Pomorze Zachodnie (NW Poland). The combined MP and PE for all 15 loci are 3.9 × 10 −18 and 0.9999988, respectively. Pairwise comparisons between Northwestern Poland and other Polish populations were performed.

Population database on 15 autosomal STR loci in 1000 unrelated individuals from the Lodz region of Poland

Allele frequency data and forensic efficiency parameters for 15 STR loci: D8S1179, D21S11, D7S820, CSF1PO, D3S1358, TH01, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, D5S818, and FGA, were estimated from the sample of 1000 unrelated individuals from the Lodz region of Poland. The combined MP and PE for all 15 loci are 4.8 × 10 −18 and 0.9999989, respectively. The comparison of our data with other Polish populations revealed statistically significant differences in 6 out of 15 loci between Lodz and the Podlasie region of Poland.

Hungarian population data of eight X-linked markers in four linkage groups

The X chromosomal STR markers DXS10135 and DXS8378 in linkage group 1, DXS7132 and DXS10074 in linkage group 2, HPRTB and DXS10101 in linkage group 3, and DXS10134 and DXS7423 in linkage group 4 were studied in the Hungarian population. After genotyping unrelated men (219) and women (165), forensic efficiency parameters were calculated. Deviations from Hardy-Weinberg equilibrium could not be detected. There were several microvariant and rare alleles were sequenced: four in locus DXS10135 (alleles 17.1, 18.1, 20.1 and 26.1), one in locus DXS10074 (alleles 11), three in locus DXS10101 (alleles 26, 34.2 and 35) and five in locus DXS10134 (alleles 35.3, 37.2, 38.2, 39.2, 41).

Genetic data for the locus SE33 in a south Portuguese population with Powerplex® ES System

Allele frequencies and forensic efficiency parameters for SE33 locus were calculated from a sample of 328 individuals residing in the south of Portugal. A significant deviation from Hardy–Weinberg equilibrium was observed. The results demonstrate the usefulness of SE33 for forensic identification, which should be added to the set of STRs loci routinely studied, namely in complex cases that involve relatives.

Hungarian population data of four X-linked markers: DXS8378, DXS7132, HPRTB, and DXS7423

DXS8378, DXS7132, HPRTB, and DXS7423 microsatellite markers located in four different X-chromosomal linkage groups were studied in the Hungarian population. After genotyping unrelated men (219) and women (165), forensic efficiency parameters showing that the four X-linked short tandem repeats are informative for forensic applications were calculated. With fragment and sequence analysis, one microvariant allele (11.2) was identified in the HPRTB locus. A deviation from the Hardy-Weinberg equilibrium could not be detected. Investigations of 96 father-child meioses revealed one mutation in the DXS7132 locus. For comparison of 22 different populations, G-tests were carried out.

Population genetics of the Identifiler system in Poland

Allele frequency data and forensic efficiency parameters for 15 Identifiler STR loci: D8S1179, D21S11, D7S820, CSF1PO, D3S1358, TH01, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, D5S818, FGA, were estimated from a sample of 125 unrelated individuals in central Poland. The accordance with the Hardy and Weinberg equilibrium (HWE) for all analyzed loci was proven. The combined power of discrimination (PD) and probability of identity (DI) were greater than 0.999999999999999 and 6.7×10 −18, respectively, which proves that this multiplex system is an excellent tool for forensic casework.

Five highly informative X-chromosomal STRs in Koreans.

The five X-chromosomal short tandem repeats (STRs) GATA172D05, HPRTB, DXS8377, DXS101 and HumARA were analyzed in 150 males and 150 females from Korea. Markers were amplified in a quadruplex and a monoplex PCR reaction with fluorescently labeled primers. For accurate and reproducible STR typing, sequenced allelic ladders were constructed and a Genotyper macro was programmed. Some differences were found on comparing the allele frequencies of Koreans with those of other populations in DXS8377, DXS101 and HumARA. The forensic efficiency parameters showed that the five X-linked STRs are highly informative for forensic application in Koreans.

Population Genetics for the CODIS Core STR Loci in the Population of Northeastern Poland

Abstract In 1997 the FBI announced the selection of 13 STRs loci to constitute the core of the United States national database-CODIS, which has been widely adopted by forensic DNA analysts in the United States (1). Polish-worldwide population today is estimated at almost 60 million. According to the last U.S. Census taken in year 2000, in the United States of America live about 9,053,660 Poles/Polish-Americans. The largest population of Poles is recorded in the state of New York, Illinois, Michigan, and Pennsylvania (2). The aim of this study was to provide a 13 STRs database for a population sample of Poland for the use as a highly discriminatory system of genetic markers in forensic community. DNA was extracted from the blood specimens of 842 unrelated adult individuals using Chelex-100 and proteinase K (3). Two commercially available kits AmpF1STR Profiler and AmpF1STR SGM Plus (Applera, US) were used to amplify the 13 STR loci included in the CODIS STR standardization project: D3S1358, vWA, D8S1179, D21S11, D18S51, TH01, FGA, TPOX, CSF1P0, D5S818, D13S317, D7S820, D16S539. Genotyping was performed in a 310 ABI Prism Genetic Analyzer. Hardy-Weinberg equilibrium was tested using the Fisher's exact test by the GDA software (4). The forensic efficiency parameters were calculated using the PowerStats software (www.promega.com/techserv/apps).

Genetic diversity and forensic evaluation of 10 STR loci in Lodz region of Poland

Allele frequency data and forensic efficiency parameters for 10 STR loci: D3S1358, vWA, D16S539, D2S1338, D8S1179, D21S11, D18S51, D19S433, TH01 and FGA, were estimated from a sample of 207 unrelated individuals in Lodz region of Poland.