title: Embryological outcomes in cycles with human oocytes containing large tubular smooth endoplasmic reticulum clusters after conventional in vitro fertilization.
abstract: There have been no studies analyzing the effect of large aggregates of tubular smooth endoplasmic reticulum (aSERT) after conventional in vitro fertilization (cIVF). The aim of this study was to investigate whether aSERT can be identified after cIVF and the association between the embryological outcomes of oocytes in cycles with aSERT. This is a retrospective study examining embryological data from cIVF cycles showing the presence of aSERT in oocytes 5-6 h after cIVF. To evaluate embryo quality, cIVF cycles with at least one aSERT-metaphase II (MII) oocyte observed (cycles with aSERT) were compared to cycles with normal-MII oocytes (control cycles). Among the 4098 MII oocytes observed in 579 cycles, aSERT was detected in 100 MII oocytes in 51 cycles (8.8%). The fertilization rate, the rate of embryo development on day 3 and day 5-6 did not significantly differ between cycles with aSERT and control group. However, aSERT-MII oocytes had lower rates for both blastocysts and good quality blastocysts (p < 0.05). aSERT can be detected in the cytoplasm by removing the cumulus cell 5 h after cIVF. However, aSERT-MII oocytes do not affect other normal-MII oocytes in cycles with aSERT.
authors.affiliation: a Department of Infertility , Green Bell Clinic, Toyota , Japan .|b Department of Infertility , Angel Bell Hospital , Okazaki , Japan .|c Faculty of Life and Environmental Sciences, University of Yamanashi , Kofu , Yamanashi, , Japan .
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Itoi
authors.affiliation: d Department of Infertility , Royal Bell Clinic , Nagoya , Japan , and.
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Asano
authors.affiliation: b Department of Infertility , Angel Bell Hospital , Okazaki , Japan .
authors.forename: Masashi
authors.initials: M
authors.lastname: Shimizu
authors.affiliation: e Sapporo ART Clinic , Sapporo , Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Honnma
authors.affiliation: b Department of Infertility , Angel Bell Hospital , Okazaki , Japan .
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Murata
mesh_terms: D000328:Adult; D047108:Embryonic Development; D018871:Endoplasmic Reticulum, Smooth; D005260:Female; D005307:Fertilization in Vitro / Q000706:statistics & numerical data*; D006801:Humans; D009865:Oocytes / Q000166:cytology*; D011247:Pregnancy; D012189:Retrospective Studies
keywords: Blastocyst; conventional IVF; developmental rate; large tubular smooth endoplasmic reticulum aggregates