Patterns of Y-STR variation in Italy

Area of Science:

• Genetics
• Forensic Science
• Population Genetics

Background:

• Y-chromosomal short tandem repeats (STRs) are crucial for human population genetics and forensic identification.
• The AmpFlSTR Yfiler Amplification Kit provides a high-resolution Y-STR profile for detailed genetic analysis.
• Understanding Y-STR diversity within and among populations is essential for accurate forensic investigations.

Purpose of the Study:

• To analyze the genetic diversity of 17 Y-STR loci in 292 samples across seven Italian regions.
• To compare Italian Y-STR haplotype data with broader European datasets.
• To evaluate the impact of Y-STR markers and sample size on population stratification analysis.

Main Methods:

• Genotyping of 17 Y-STR loci using the AmpFlSTR Yfiler Amplification Kit.
• Analysis of 292 samples from seven Italian regions.
• Comparative analysis with existing European Y-STR databases (19 and 67 populations).
• Application of Analysis of Molecular Variance (AMOVA) to assess population structure.

Main Results:

• Observed 276 unique Yfiler haplotypes in Italy, with low sharing among regional samples.
• Overall haplotype diversity in Italy (0.9996) is comparable to other European populations.
• AMOVA indicated that among-population variance is influenced by the number of Y-STRs and population samples used.
• Geographic stratification within Italy was less pronounced than in other European samples, with latitude playing a more significant role than longitude.

Conclusions:

• Extended Y-STR profiles significantly increase discriminatory capacity for forensic individual identification.
• The study contributes valuable high-resolution Y-chromosome data to existing databases.
• Italian populations exhibit relatively low genetic stratification compared to other European groups.