Scientifically the case is understood as heteropaternal superfertilization, a rare phenomenon that happens when a second egg, released during an equivalent cycle, is fertilized by a sperm from a special man in separate sex. A group of scientists from the National University of Colombia documented a case of twins from different fathers, during the study of evidence requested by a person who inquired about the paternity of youngsters. The case began in August 2018 when the Population Genetics and Identification Group of the National University of Colombia (UNAL) received an invitation to determine with genetic markers the paternity of two male twins from the alleged father, who suspected that the youngsters won’t be his children.

According to a press release from the press agency of the National University, after comparing the DNA of the alleged father of the pair of twins, the group of scientists showed that this coincided with the genetic profile of just one of them, that is, that for the opposite it had been an exclusion of paternity. Scientifically the case is understood as heteropaternal superfertilization, a rare phenomenon that happens when a second egg, released during an equivalent cycle, is fertilized by a sperm from a special man in separate sex. The doctor in Science-Biology of the National University Lilian Andrea Casas Vargas said that when there are very difficult cases otherwise you want to make certain of the results of the paternity tests, the laboratory performs other markers. In this case, the statement adds, one referred to as a “Y chromosome panel” was made, taking under consideration that the twins are male, the scientist indicated.

THE PROCEDURE

Casas explained that this procedure may be a tool widely utilized in parental affiliation tests. “The Y chromosome is secreted only by the paternal line, and it does so en masse from one generation to a different, it never changes. So, by not changing, it’s expected that those Y chromosome markers are completely just like the fathers. during this case, the genetic profile coinciding with one among the twins is observed again, while 14 out of 17 were identified with the opposite. no matches, which corroborated the exclusion, adds the knowledge. Casas acknowledged that, consistent with protocols established within the laboratory, when a case of paternity arrives and it leads to “exclusion” the whole process is repeated to verify that there have been no technical errors during the analysis.

This is how they called again those involved, who were taken other samples and therefore the results were an equivalent, therefore the case was confirmed, which has been published within the Biomedical Journal of the state National Institute of Health. The director of the UNAL Population Genetics and Identification Group, William Usaquén, quoted within the publication, indicated that in Colombia a mean of 11,000 paternity tests is administered per annum. Although it’s an easy procedure, this (test) features a very large emotional charge thanks to the sort of social and cultural implications it’s. The filiation opinions reveal a series of prejudices that are still latent in Colombian society regarding issues like motherhood or sexuality, for instance, Usaquen said.