Academic pursuits in board-certified reproductive endocrinologists.

OBJECTIVE: To determine research interests of reproductive endocrinology and infertility (REI) physicians and assess their academic productivity. DESIGN: A questionnaire composed by the Society for REI (SREI) board members was e-mailed to members. PubMed was queried to quantify peer-reviewed publications. SETTING: An internal SREI questionnaire to members and online publication search. PATIENT(S): Not applicable. INTERVENTION(S): Questions involving research being performed, funding, relevance to fellow thesis, and important areas of future research. Publications were ascertained in the past 3 years, past 10 years, and total publications for SREI members. MAIN OUTCOME MEASURE(S): Question responses and number of peer-reviewed publications. RESULT(S): Most respondents currently conduct research, which was predominantly clinical. One-third have current research funding and two-thirds were ever funded. One-third had a National Institutes of Health grant and about half were principal investigators. Two-thirds had a basic science fellow thesis and 44% of respondents perform research related to their fellowship thesis. Important research areas included infertility outcomes, implantation, preimplantation genetic testing, and genetics. In the past 3 years, SREI members published 3,408 peer-reviewed articles (mean ± standard deviation [SD], 4.4 ± 9.0). In the past 10 years, SREI members had 10,162 peer-reviewed publications (mean±SD, 13.0 ± 24.3). When all publications were considered, SREI members published 24,088 peer-reviewed articles (mean±SD, 30.9 ± 53.0). CONCLUSION(S): The REI fellows have learned to construct scientific articles, which will help them to better interpret the literature in the care of patients. The SREI members continue to pursue scientific investigation, commonly related to their fellowship thesis. Respondents support SREI funding research; the success of which should be judged by publications. Overall, SREI members have demonstrated significant academic productivity and published about 1,000 articles/year for the past 10 years, affirming the importance of research training.

Plzf is required in adult male germ cells for stem cell self-renewal.

Adult germline stem cells are capable of self-renewal, tissue regeneration and production of large numbers of differentiated progeny. We show here that the classical mouse mutant luxoid affects adult germline stem cell self-renewal. Young homozygous luxoid mutant mice produce limited numbers of normal spermatozoa and then progressively lose their germ line after birth. Transplantation studies showed that germ cells from mutant mice did not colonize recipient testes, suggesting that the defect is intrinsic to the stem cells. We determined that the luxoid mutant contains a nonsense mutation in the gene encoding Plzf, a transcriptional repressor that regulates the epigenetic state of undifferentiated cells, and showed that Plzf is coexpressed with Oct4 in undifferentiated spermatogonia. This is the first gene shown to be required in germ cells for stem cell self-renewal in mammals.

Reproductive aging and variability in the ovarian antral follicle count: application in the clinical setting.

OBJECTIVE: To determine the extent of intercycle and interobserver variability in antral follicle (AF) count and their impact on stimulation quality in IVF. DESIGN: Prospective evaluation of the impact on AF count of GnRH agonist down-regulation and interobserver variability. Retrospective evaluation of intercycle variability in AF count. SETTING: University ART clinic. PATIENT(S): Twenty subjects were used to evaluate the effect of GnRH agonist down-regulation upon AF count; six of whom were used to evaluate interobserver variability. Fifty patients experiencing two or three cycles of IVF within a 1-year interval. INTERVENTION(S): Transvaginal ultrasound exams before and after down-regulation with a GnRH agonist. Videotaped day-3 transvaginal ultrasound exams. MAIN OUTCOME MEASURE(S): [1] Intercycle and interobserver variability in antral follicle count. [2] Oocytes retrieved, peak estradiol, gonadotropin dose, duration of stimulation and cancellation rates. RESULT(S): There is moderate intercycle and interobserver variability in AF counts. GnRH agonist down-regulation does not significantly change AF count. In infertility patients undergoing IVF, paired analysis between the low- and high-AF count cycles did not show a difference in quality of stimulation or cycle cancellation rates. CONCLUSIONS: Within an individual patient, higher AF count in a given cycle was not predictive of better stimulation compared with the case of a lower count cycle.