En Colombia se confirma estos días un nuevo caso de superfecundación heteoparetal. Esto es, cuando es fertilizado un segundo óvulo del mismo ciclo menstrual.
En agosto de 2018 un hombre indaga sobre la paternidad de dos niños, petición que llega al Grupo de Genética de Poblaciones e Identificación de la Universidad Nacional de Colombia. Tras el cotejo del ADN, se notifica al interesado la coincidencia con el perfil genético de solo uno de ellos, lo que se conoce como fecundación hetereopaternal. Un segundo óvulo es fertilizado por un espermatozoide de un hombre diferente.
DOS MELLIZAS, HIJAS DE PADRES DIFERENTES
En 1997, un grupo de médicos de la Universidad de Granada descubrieron que dos mellizas son hijas de padres diferentes. En principio, los médicos quedaron pasmados, pues, si ya es difícil que una mujer produzca dos óvulos en el mismo ciclo menstrual, más remota es la posibilidad de que ambos sean fecundados en menos de 72 horas por el semen de dos varones. La confirmación de los laboratorios de la Universidad del Norte de Tejas, donde cada día se realizan un centenar de pruebas de paternidad con un elevado grado de fiabilidad, puso al descubierto entre 24 y 72 horas clave en la vida amorosa de la mujer. Primero tuvo relaciones sexuales con un hombre, quizás su marido, cuyo esperma fecundó un óvulo. Menos de dos días después mantuvo un nuevo contacto sexual, pero ahora con otro sujeto, que casualmente abonó en sus entrañas un segundo óvulo.
actualización, 27 de enero de 2021
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