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Full-Text Articles in Medicine and Health Sciences
Intrinsic Differences In The Response Of The Human Lutropin Receptor Versus The Human Follitropin Receptor To Activating Mutations, Meilin Zhang, Ya-Xiong Tao, Ginny Ryan, Xiuyan Feng, Francesca Fanelli, Deborah Segaloff
Intrinsic Differences In The Response Of The Human Lutropin Receptor Versus The Human Follitropin Receptor To Activating Mutations, Meilin Zhang, Ya-Xiong Tao, Ginny Ryan, Xiuyan Feng, Francesca Fanelli, Deborah Segaloff
Ginny L. Ryan
In contrast to the human lutropin receptor (hLHR), very few naturally occurring activating mutations of the structurally related human follitropin receptor (hFSHR) have been identified. The present study was undertaken to determine if one aspect underlying this discrepancy might be a general resistance of the hFSHR to mutation-induced constitutive activity. Five different mutations were introduced into both the hLHR and hFSHR (four based on activating mutations of the hLHR gene, one based on an activating mutation of the hFSHR gene). Our results demonstrate that hFSHR constitutively activating mutants (CAMs) were not as active as hLHR CAMs containing the comparable mutation. …
In Vitro Fertilization Is Associated With An Increase In Major Birth Defects, C. Olson, K. Keppler-Noreuil, P. Romitti, W. Budelier, Ginny Ryan, Amy Sparks, Bradley Van Voorhis
In Vitro Fertilization Is Associated With An Increase In Major Birth Defects, C. Olson, K. Keppler-Noreuil, P. Romitti, W. Budelier, Ginny Ryan, Amy Sparks, Bradley Van Voorhis
Ginny L. Ryan
OBJECTIVE: To determine the risk of major birth defects in cohorts of children conceived through IVF or through IUI as compared with naturally conceived children. DESIGN: Retrospective cohort study. SETTING: Academic medical center. PATIENT(S): Children conceived by IVF or IUI at the University of Iowa from 1989 through 2002, compared with a matched cohort of naturally conceived children. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Outcome data were obtained from Iowa state birth and fetal death certificates and from the Iowa Birth Defects Registry. RESULT(S): Ninety of 1,462 IVF-conceived children (6.2%) and 17 of 343 IUI-conceived children (5.0%) had a major birth …
A Mandatory Single Blastocyst Transfer Policy With Educational Campaign In A United States Ivf Program Reduces Multiple Gestation Rates Without Sacrificing Pregnancy Rates, Ginny Ryan, Amy Sparks, C. Sipe, Craig Syrop, A. Dokras, Bradley Van Voorhis
A Mandatory Single Blastocyst Transfer Policy With Educational Campaign In A United States Ivf Program Reduces Multiple Gestation Rates Without Sacrificing Pregnancy Rates, Ginny Ryan, Amy Sparks, C. Sipe, Craig Syrop, A. Dokras, Bradley Van Voorhis
Ginny L. Ryan
OBJECTIVE: To reduce the twin rate in our IVF program. DESIGN: A prospective educational study of infertile couples; a retrospective review of IVF outcomes before vs. after mandatory single embryo transfer (mSBT) policy change. SETTING: University-based infertility center. PATIENT(S): One hundred ten of 120 consecutive new infertile couples completed the educational study. Outcomes of all embryo transfers (n = 693) performed 17 months before and 17 months after mSBT were evaluated. INTERVENTION(S): A 1-page educational summary of comparative risks of twins vs. singletons to maternal and child health. MAIN OUTCOME MEASURE(S): Knowledge of twin risks and desired number of embryos …
Evaluating The Roles Of Follicle-Stimulating Hormone Receptor Polymorphisms In Gonadal Hyperstimulation Associated With Severe Juvenile Primary Hypothyroidism, Ginny Ryan, X. Feng, C. D'Alva, M. Zhang, Bradley Van Voorhis, E. Pinto, A. Kubias, S. Antonini, A. Latronico, D. Segaloff
Evaluating The Roles Of Follicle-Stimulating Hormone Receptor Polymorphisms In Gonadal Hyperstimulation Associated With Severe Juvenile Primary Hypothyroidism, Ginny Ryan, X. Feng, C. D'Alva, M. Zhang, Bradley Van Voorhis, E. Pinto, A. Kubias, S. Antonini, A. Latronico, D. Segaloff
Ginny L. Ryan
CONTEXT: Rare activating mutations of the human (h)FSHR have been reported in some women with spontaneous ovarian hyperstimulation in pregnancy, where follicular growth is inappropriately stimulated by elevated concentrations of human chorionic gonadotropin acting through the hFSHR. It is not known whether ovarian hyperstimulation in peripubertal girls with untreated primary hypothyroidism is caused by hFSHR mutations and/or influenced by hFSHR allelic variants, rendering the hFSHR more sensitive to circulating TSH. OBJECTIVE: The aim of the study was to determine whether mutations of the hFSHR and/or hFSHR allelic variants are associated with greater sensitivity of the hFSHR to TSH. DESIGN: The …