Genétic portrait of 12 X-STR loci in Brasil immigrant population living in Lisbon (preliminary results)

Afonso Costa, Heloísa; Amorim, António; Vieira Silva, Cláudia; Reis, Fátima; Ribeiro, Teresa; Porto. Maria João; Corte-Real, Francisco

http://hdl.handle.net/10400.26/58952

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Authors

Afonso Costa, Heloísa

Amorim, António

Vieira Silva, Cláudia

Reis, Fátima

Ribeiro, Teresa

Porto. Maria João

Corte-Real, Francisco

Abstract(s)

Typing X-chromosome markers (ChrX) is important to complement the analysis of Y and autosomal (AS) short tandem repeats (STR). The main field of the ChrX is kinship investigations, especially investigations of mother/son, father/daughter and complex kinship tests. When the alleged father is not present, the ChrX investigation is more accurate because the mean exclusion chance of X-STRs in these cases is higher. ChrX markers testing also prove helpful for kinship tests in which only remote relatives are available for testing, particularly from the need to rejoin families in the context of war, mass disasters and world-wide migration. Since male family members are more likely to be affected by the consequences of socio-demographic unrest than females, and it may therefore be more difficult to obtain samples from them, ChrX marker testing could be a very useful tool. Immigrant populations contributes to increase social, cultural, religious, linguistic, anthropological and genetic heterogeneity in a population. According to the portuguese database PORDATA , in 2016, the number of immigrants from Brazil who have fixed residence in Portugal was 79,569. From those, up to 40.084 live in Lisboa and near cities. Consequently, we are therefore faced with a population reality completely different from the one at the early ninety’s of the last century. Before forensic application, it´s important to study population data and to construct reference databases to document the genetic variation of specific STR among worldwide populations. Population data is vital to quantify the evidentiary value of a match in forensic evaluation. The aims of this study were to calculate allele frequencies and create a population database for X-STR markers for Brazil natives, living in Lisboa for future use in forensic genetics practice.