CENP-V As a Potential Diagnostic Marker of Damage in Human Oocytes

NCT ID: NCT06788379

Last Updated: 2025-01-23

Basic Information

• Recruitment Status: RECRUITING
• Total Enrollment: 160 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2024-10-04
• Study Completion Date: 2026-12-31

Brief Summary

Proper chromosome segregation is essential to avoid aneuploidy, yet in mammalian oocytes it progressively fails in an age-dependent manner. The ageing population and the increasing age of parenthood are leading to a declined fertility. Proteins contributing to correct chromosome segregation and oocyte ageing are therefore of central interest. Mouse oocytes deficient in CENP-V are strongly impaired in meiosis I. The spindle assembly checkpoint (SAC)-dependent arrest of about half of the Cenp-V -/- oocytes at metaphase I is only found in oocytes from young adults, not in oocytes >12 months. This suggests SAC weakening in ageing oocytes allowing them to proceed despite continuous presence of mis-aligned chromosomes and present CENP-V depleted oocytes as a model for age dependent weakening of the SAC. Sporadic cases of very-low oocyte survival rate have been observed after vitrification and thawing protocols in the clinical practice. However, no diagnostic tools are currently available to detect these cases. The relevance of this problem has led to a demand on the scientific community to obtain specific and early biomarkers to predict decreased oocyte survival rates after thawing. The main goal of this project is to establish the expression levels of the CENP-V protein in human oocytes as a diagnostic tool for the aging of a cohort of oocytes. With this purpose, the immature oocytes from the oocytes cohort recovered from women with advanced maternal age (AMA) and control, will be matured in vitro in order to compare the CENP-V expression levels between both populations. In addition, in patients with AMA, these expression levels will be correlated with the aneuploidy rate from the blastocyst of the same oocyte cohort. CENP-V-deleted mouse oocytes show higher rate of aneuploidy and spindle aberrations after cold treatment compared to control oocytes. We hypothesize that alterations in the expression level of CENP-V could be responsible of the decrease in oocyte survival rate after thawing. The main objective of this project is to establish the expression levels of the CENP-V protein in human oocytes as a diagnostic tool to assess the damage of a cohort of oocytes. For this purpose, oocytes retrieved from advanced maternal age (AMA) and control patients, as well as oocytes undergoing vitrification / thawing procedures and controls oocytes, will be analyzed. In this study, only the immature oocytes of the patients, which are destined to be discarded and not used in their treatment, will be analyzed.

Detailed Description

This is a prospective, unicentric, descriptive and transversal study. The main objective of this project is to establish the expression levels of the CENP-V protein in human oocytes as a diagnostic tool of damage in a cohort of human oocytes. With this purpose, CENP-V levels of discarded oocytes retrieved from Advanced Maternal Age (AMA) and control patients will be analyzed in fresh state and after vitrification-thawing procedures. As mature oocytes will be used for the patient's treatment, only immature oocytes, that would otherwise have been discarded, or mature oocyte donated to research, will be used in this project.

Conditions

Establish the Amount of CENPV Protein in Human Oocytes As a Diagnostic Tool Against Damage Caused by Ageing or by the Procedure of Vitrification of Oocytes; Advance Maternal Age; Vitrification and Thawing

Study Design

• Observational Model Type: OTHER
• Study Time Perspective: PROSPECTIVE

Study Groups

Patients with advanced maternal age (AMA)

Patients aged 36-45 years with AMA etiology as the main factor of infertility undergoing controlled ovarian stimulation

No interventions assigned to this group

Control patients

Patients and donors with normal etiology, aged 18-35 years, undergoing controlled ovarian stimulation and collection procedures.

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

• Group of patients with advanced maternal age (AMA): patients aged 36-45 years with AMA etiology as the main factor of infertility undergoing controlled ovarian stimulation.
• Group of patients with vitrification / thawing of their oocytes: patients between 18-45 years of age who underwent oocyte vitrification to later, in the study cycle, thaw their oocytes. In this group we contemplate two subgroups:

• Patients with vitrified / thawed oocytes and AMA: between 36-45 years at the moment of oocytes vitrification.
• Patients with vitrified / thawed oocytes and non-AMA: between 18-35 years at the moment of oocytes vitrification.
• Group of control patients: patients and donors with normal etiology, aged 18-35 years, undergoing controlled ovarian stimulation and collection procedures.

Exclusion Criteria

• Patients with pathologies affecting the oocyte quality (PCO, POI, endometriosis, oncology patients, etc.).
• Patients/donors with oocyte cryopreserved by slow freezing technique.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 45 Years
• Eligible Sex: FEMALE
• Accepts Healthy Volunteers: No

Sponsors

University of Seville, Spain

UNKNOWN

Sponsor Role: collaborator

Vida Recoletas Sevilla

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

Vida Recoletas Sevilla S.L.

Seville, SEVILLA, Spain

Site Status: RECRUITING

Countries

Spain

Central Contacts

ESTHER SANTAMARÍA LÓPEZ

Role: CONTACT

esther.santamaria@gruporecoletas.com

+34954286274

Facility Contacts

ESTHER SANTAMARÍA LÓPEZ

Role: primary

esther.santamaria@gruporecoletas.com

+34954286274

Other Identifiers

2012-SEV-102-MF

Identifier Type: -

Identifier Source: org_study_id