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

  • Assisted Reproduction Technologies
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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 “reasonable” 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 “reasonable” number of children born per donor in Spain.

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Author information

Authors and Affiliations

  1. Unidad de Reproducción Humana, UGC Laboratorio Clínico y UGC Obstetricia y Ginecología, CHU Granada, Instituto de Investigación Biosanitaria de Granada (IIBG), Granada, Spain

    Isabel M. Sánchez-Castelló, María C. Gonzalvo, Ana Clavero, María L. López-Regalado, Juan Mozas, Luis Martínez-Granados, Purificación Navas & José A. Castilla

  2. CEIFER Biobanco and Clinica MasVida Reproducción, Granada, Spain

    José A. Castilla

  3. Dpto. Anatomía y Embriología Humana, F. Medicina, U. Granada, Granada, Spain

    José A. Castilla

Authors
  1. Isabel M. Sánchez-Castelló
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  2. María C. Gonzalvo
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  3. Ana Clavero
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  4. María L. López-Regalado
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  5. Juan Mozas
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  6. Luis Martínez-Granados
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  7. Purificación Navas
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  8. José A. Castilla
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Corresponding author

Correspondence to María L. López-Regalado.

Additional information

Capsule 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.

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Sánchez-Castelló, I.M., Gonzalvo, M.C., Clavero, A. et al. Maximum number of children per sperm donor based on false paternity rate. J Assist Reprod Genet 34, 345–348 (2017). https://doi.org/10.1007/s10815-016-0860-8

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  • DOI: https://doi.org/10.1007/s10815-016-0860-8

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