Your browser doesn't support javascript.
loading
Developmental clock compromises human twin model created by embryo splitting.
Noli, Laila; Dajani, Yaser; Capalbo, Antonio; Bvumbe, Jean; Rienzi, Laura; Ubaldi, Filippo Maria; Ogilvie, Caroline; Khalaf, Yacoub; Ilic, Dusko.
Afiliação
  • Noli L; Division of Women's Health, Faculty of Life Sciences and Medicine, King's College London and Assisted Conception Unit, Guys' Hospital, London SE1 9RT, UK.
  • Dajani Y; Division of Women's Health, Faculty of Life Sciences and Medicine, King's College London and Assisted Conception Unit, Guys' Hospital, London SE1 9RT, UK.
  • Capalbo A; GENERA, Centre for Reproductive Medicine, Clinica Valle Giulia, Rome 00197, Italy GENETYX, Molecular Genetics Laboratory, Via Fermi 1, Marostica 36063, Italy.
  • Bvumbe J; Division of Women's Health, Faculty of Life Sciences and Medicine, King's College London and Assisted Conception Unit, Guys' Hospital, London SE1 9RT, UK.
  • Rienzi L; GENERA, Centre for Reproductive Medicine, Clinica Valle Giulia, Rome 00197, Italy GENETYX, Molecular Genetics Laboratory, Via Fermi 1, Marostica 36063, Italy.
  • Ubaldi FM; GENERA, Centre for Reproductive Medicine, Clinica Valle Giulia, Rome 00197, Italy GENETYX, Molecular Genetics Laboratory, Via Fermi 1, Marostica 36063, Italy.
  • Ogilvie C; Genetics Laboratories, Guy's Hospital, London, UK.
  • Khalaf Y; Division of Women's Health, Faculty of Life Sciences and Medicine, King's College London and Assisted Conception Unit, Guys' Hospital, London SE1 9RT, UK.
  • Ilic D; Division of Women's Health, Faculty of Life Sciences and Medicine, King's College London and Assisted Conception Unit, Guys' Hospital, London SE1 9RT, UK dusko.ilic@kcl.ac.uk.
Hum Reprod ; 30(12): 2774-84, 2015 Dec.
Article em En | MEDLINE | ID: mdl-26489438
ABSTRACT
STUDY QUESTION Is the quality of the human embryos generated by twinning in vitro comparable to the quality of the embryos created by fertilization? SUMMARY ANSWER Our data suggest that the human twin embryos created in vitro are unsuitable not only for clinical use but also for research purposes. WHAT IS KNOWN ALREADY Pregnancy from in vitro generated monozygotic twins by embryo splitting or twinning leads to live birth of healthy animals. Similar strategies, however, have been less successful in primates. Recent reports suggest that the splitting of human embryos might result in viable, morphologically adequate blastocysts, although the qualitative analyses of the embryos created in such a way have been very limited. STUDY DESIGN, SIZE, DURATION This study was a comparative analysis of embryos generated by twinning in vitro and the embryos created by in vitro fertilization. PARTICIPANTS/MATERIALS, SETTING,

METHODS:

We analysed morphokinetics and developmental competence of 176 twin embryos created by splitting of 88 human embryos from either early (2-5 blastomeres, n = 43) or late (6-10 blastomeres, n = 45) cleavage stages. We compared the data with morphometrics of embryos created by in vitro fertilization and resulting in pregnancy and live birth upon single blastocyst transfer (n = 42). MAIN RESULTS AND THE ROLE OF CHANCE The morphokinetic data suggested that the human preimplantation development is subjected to a strict temporal control. Due to a 'developmental clock', the size of twin embryos was proportionate to the number of cells used for their creation. Furthermore, the first fate decision was somewhat delayed; the inner cell mass (ICM) became distinguishable later in the twin than in the normal blastocysts obtained through fertilization. If an ICM was present at all, it was small and of poor quality. The majority of the cells in the twin embryos expressed ICM and trophectoderm markers simultaneously. LIMITATIONS, REASONS FOR CAUTION We created monozygotic twins by blastomere separation from cleavage stage embryos. Embryo twinning by blastocyst bisection may circumvent limitations set by the developmental clock. WIDER IMPLICATIONS OF THE

FINDINGS:

Taken together, our data suggest that the human twin embryos created in vitro are unsuitable not only for clinical use but also for research purposes.
Assuntos
Palavras-chave

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Gêmeos Monozigóticos / Blastocisto / Blastômeros / Desenvolvimento Embrionário / Transferência Embrionária Tipo de estudo: Prognostic_studies / Qualitative_research Limite: Female / Humans / Pregnancy Idioma: En Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Gêmeos Monozigóticos / Blastocisto / Blastômeros / Desenvolvimento Embrionário / Transferência Embrionária Tipo de estudo: Prognostic_studies / Qualitative_research Limite: Female / Humans / Pregnancy Idioma: En Ano de publicação: 2015 Tipo de documento: Article