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PLCζ disruption with complete fertilization failure in normozoospermia

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Abstract
Purpose: Intracytoplasmic sperm injection (ICSI) is widely used to achieve fertilization in the presence of severe male factor, resulting in high fertilization rates. Nevertheless, 1–3 % of couples experience complete fertilization failure after ICSI.When a male factor is identified, assisted oocyte activation (AOA) can help overcome fertilization failures. The objective of this study is to describe a case of repeated complete fertilization failures after ICSI with donor oocytes, and to investigate the molecular and functional aspects of phospholipase C zeta (PLCζ) protein in the patient semen. Methods: The patient was a normozoospermic male who had previously fathered, through natural conception, four children by a different partner. Molecular and functional analysis of sperm-specific PLCζ in the patient and control samples by means of gene sequencing, immunocytochemistry, Western blot, mouse oocyte activation test (MOAT), and mouse oocyte calcium analysis (MOCA) were used. Results: PLCζ expression levels and distribution were significantly disrupted, although MOAT and MOCA did not indicate a decrease in activation ability. Conclusions: Normozoospermic males can have disrupted expression and distribution of PLCζ, and reduced activation ability after ICSI in human oocytes, despite their normal activation potential in functional testing using mouse oocytes. Discrepancy among molecular and functional data might exist, as mutations in the gene sequence may not be the only cause of alteration in PLCζ protein related to activation failures.
Keywords
Assisted oocyte activation, PHOSPHOLIPASE-C-ZETA, Fertilization failure, INTRACYTOPLASMIC SPERM INJECTION, PLC zeta, Normozoospermia, ICSI, ASSISTED OOCYTE ACTIVATION, MALE FACTOR INFERTILITY, FAILED FERTILIZATION, SUCCESSFUL PREGNANCY, CALCIUM IONOPHORE, BINDING-PROTEIN, ICSI, SPERMATOZOA

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Chicago
Durban, Mercè, Montserrat Barragan, Marta Colodron, Minerva Ferrer Buitrago, Petra De Sutter, Björn Heindryckx, Valérie Vernaeve, and Rita Vassena. 2015. “PLCζ Disruption with Complete Fertilization Failure in Normozoospermia.” Journal of Assisted Reproduction and Genetics 32 (6): 879–886.
APA
Durban, M., Barragan, M., Colodron, M., Ferrer Buitrago, M., De Sutter, P., Heindryckx, B., Vernaeve, V., et al. (2015). PLCζ disruption with complete fertilization failure in normozoospermia. JOURNAL OF ASSISTED REPRODUCTION AND GENETICS, 32(6), 879–886.
Vancouver
1.
Durban M, Barragan M, Colodron M, Ferrer Buitrago M, De Sutter P, Heindryckx B, et al. PLCζ disruption with complete fertilization failure in normozoospermia. JOURNAL OF ASSISTED REPRODUCTION AND GENETICS. 2015;32(6):879–86.
MLA
Durban, Mercè, Montserrat Barragan, Marta Colodron, et al. “PLCζ Disruption with Complete Fertilization Failure in Normozoospermia.” JOURNAL OF ASSISTED REPRODUCTION AND GENETICS 32.6 (2015): 879–886. Print.
@article{7000749,
  abstract     = {Purpose: Intracytoplasmic sperm injection (ICSI) is widely used to achieve fertilization in the presence of severe male factor, resulting in high fertilization rates. Nevertheless, 1--3 \% of couples experience complete fertilization failure after ICSI.When a male factor is identified, assisted oocyte activation (AOA) can help overcome fertilization failures. The objective of this study is to describe a case of repeated complete fertilization failures after ICSI with donor oocytes, and to investigate the molecular and functional aspects of phospholipase C zeta (PLC\ensuremath{\zeta}) protein in the patient semen.
Methods: The patient was a normozoospermic male who had previously fathered, through natural conception, four children by a different partner. Molecular and functional analysis of sperm-specific PLC\ensuremath{\zeta} in the patient and control samples by means of gene sequencing, immunocytochemistry, Western blot, mouse oocyte activation test (MOAT), and mouse oocyte calcium analysis (MOCA) were used.
Results: PLC\ensuremath{\zeta} expression levels and distribution were significantly disrupted, although MOAT and MOCA did not indicate a decrease in activation ability.
Conclusions: Normozoospermic males can have disrupted expression and distribution of PLC\ensuremath{\zeta}, and reduced activation ability after ICSI in human oocytes, despite their normal activation potential in functional testing using mouse oocytes. Discrepancy among molecular and functional data might exist, as mutations in the gene sequence may not be the only cause of alteration in PLC\ensuremath{\zeta} protein related to activation failures.},
  author       = {Durban, Merc{\`e} and Barragan, Montserrat and Colodron, Marta and Ferrer Buitrago, Minerva and De Sutter, Petra and Heindryckx, Bj{\"o}rn and Vernaeve, Val{\'e}rie and Vassena, Rita},
  issn         = {1058-0468},
  journal      = {JOURNAL OF ASSISTED REPRODUCTION AND GENETICS},
  keyword      = {Assisted oocyte activation,PHOSPHOLIPASE-C-ZETA,Fertilization failure,INTRACYTOPLASMIC SPERM INJECTION,PLC zeta,Normozoospermia,ICSI,ASSISTED OOCYTE ACTIVATION,MALE FACTOR INFERTILITY,FAILED FERTILIZATION,SUCCESSFUL PREGNANCY,CALCIUM IONOPHORE,BINDING-PROTEIN,ICSI,SPERMATOZOA},
  language     = {eng},
  number       = {6},
  pages        = {879--886},
  title        = {PLC\ensuremath{\zeta} disruption with complete fertilization failure in normozoospermia},
  url          = {http://dx.doi.org/10.1007/s10815-015-0496-0},
  volume       = {32},
  year         = {2015},
}

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