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Molecular Associations With Reproductive Failure

This study has been completed.
CROWN Foundation
Information provided by (Responsible Party):
University of Pittsburgh Identifier:
First received: February 27, 2006
Last updated: December 5, 2014
Last verified: December 2014
The overall hypothesis to be tested is: women with the molecular phenotype of highly skewed X chromosome inactivation are at increased risk of spontaneous abortion.

Spontaneous Abortions

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: Molecular Associations With Reproductive Failure

Further study details as provided by University of Pittsburgh:

Primary Outcome Measures:
  • Skewed X-Inactivation is not associated with Reproductive Failure [ Time Frame: 5 years ]

Enrollment: 475
Study Start Date: September 2000
Study Completion Date: January 2008
Primary Completion Date: January 2008 (Final data collection date for primary outcome measure)
Detailed Description:

The overall hypothesis to be tested is: women with the molecular phenotype of highly skewed X chromosome inactivation are at increased risk of spontaneous abortion.

We will investigate this hypothesis through two complimentary aims. In the Background and Significance section, we first present data on a 53-member pedigree segregating an X-linked recessive lethal defect that results in skewed X inactivation in the carrier females via secondary selection against those cells with the defective X chromosome active. We have characterized this deletion to be a 500 kb (approximate) deletion in distal Xq28. Moreover, the carrier females show a statistically significant increase in the frequency of spontaneous abortion as compared to non-deletion carrying relatives. Secondly, in the Preliminary Studies section, we present data from a population based case-control study wherein highly skewed X chromosome inactivation is significantly correlated with idiopathic recurrent spontaneous abortion. This protocol attempts to elucidate the mechanism underlying this association.

The first specific aim is to determine if women with highly skewed X chromosome inactivation are at risk of pregnancy loss. This will be accomplished through a prospective protocol, analyzing X chromosome inactivation patterns in pregnant women and investigating a possible association between X chromosome inactivation and pregnancy outcome. The second aim will study the nature of pregnancy loss in women with skewed X chromosome inactivation. This aim will correlate maternal X inactivation patterns with abortus karyotype.


Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Patients are recruited through Genetics during a counseling session.

Inclusion Criteria:

  • Patients are prospectively ascertained women with either a new pregnancy (specific aim 1), or a spontaneous abortion (specific aim 2).
  • Given our enrollment strategy, we anticipate enrolling women between the ages of 18 and 45.

Exclusion Criteria:

  • The study is limited only to females.
  • Children are not eligible to participate in this study. Because the patient populations studied are (aim 1) women with primary infertility undergoing fertility treatment and (aim 2) women who have recently had a spontaneous abortion, the research topic is irrelevant to children.
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Please refer to this study by its identifier: NCT00298116

United States, Pennsylvania
Magee-Womens Hospital
Pittsburgh, Pennsylvania, United States, 15213
Sponsors and Collaborators
University of Pittsburgh
CROWN Foundation
Principal Investigator: W. Allen Hogge, MD University of Pittsburgh and Magee-Womens Hospital
  More Information

Responsible Party: University of Pittsburgh Identifier: NCT00298116     History of Changes
Other Study ID Numbers: 0502108
Study First Received: February 27, 2006
Last Updated: December 5, 2014

Additional relevant MeSH terms:
Abortion, Spontaneous
Genital Diseases, Male
Genital Diseases, Female
Pregnancy Complications processed this record on April 25, 2017