Maximum number of children per sperm donor based on false paternity rate

Abstract

Purpose The aim of this study is to estimate the weight of each relevant factor in such unions of inadvertent consanguinity and to determine a Breasonable^limit for the number of children per donor, matching the probability of inadvertent consanguinity arising from the use of sperm donor in assisted reproduction with that of such a union arising from false paternity. Methods In this study, we applied to Spanish data a mathematical model of consanguineous unions, taking into account the following factors: maximum number of live births/donor, fertility rate, average number of births per donor in a pregnancy, donor success rate, matings per phenotype, number of newborns/year, and number of donors needed in the population/year and births by false paternity. Results In Spain, the number of inadvertent unions between descendants of the same donor in Spain has been estimated at 0.4/year (one every two and a half years), although this frequency decreases as the reference population increases. On the other hand, the frequency of unions between family members due to false paternity has been estimated at 6.1/year. Thus, only 6% of such unions are due to the use of donor sperm. Conclusion A total of 25 children per sperm donor are needed to align the probability of inadvertant consanguinity arising from the use of assisted reproduction with that due to false paternity. Therefore, we consider this number to be the maximum Breasonable^number of children born per donor in Spain.

Sperm and oocyte bank set-up

“…It has been shown that the risk of unions between descendants of the same sperm donor is very low, and that this type of union is, in fact, much more frequent among descendants of the same father due to false paternity (8). In Spain, it has been estimated that the maximum number of children per donor that equalises the risk of unions between descendants of the same donor with that of unions between descendants of the same person due to false paternity is 25 children per donor (9). Accordingly, most limits in this respect in European countries should be revised upwards, thus making more donor gametes available.…”