Embryonenforschung in der Schweiz - keine Sciencefiction, sondern Realität!

Von 1992 bis 1997 wurden in Genf überzählige Embryonen bis zu sieben Tage weiterentwickelt und eingefroren. Die Hälfte überlebte diese Experimente nicht. Die Ergebnisse wurden mehrfach publiziert.

Weitere Experimente:

Universitätsspital Genf - Analytisches Labor in Genf
Frauenklinik des Universitätsspitals Zürich

Letzte Aktualisierung 15.03.2003

Universitätsspital in Genf

Embryo im Blastozyststadium ca. 6 TageDefinitiver Befund nach Durchsicht des Originalartikels:

Die vorliegende Studie wurde Paaren durchgeführt, welche sich dem IVF-Programm an der Klinik des Universitätsspitals von Genf unterzogen. Die Studie bezieht sich auf die Zeit vom April 1992 bis März 1997. Im Rahmen von routinemässig durchgeführten IVF-Behandlungen mit Embryotransfer wurden insgesamt 423 Embryonen überzählig. Davon erreichten 200 das Blastocyststadium (Entwicklungsstadium nach 5 bis 8 Tagen), 223 gingen zugrunde. Von den 200 wurden aber nur 172 eingefroren, 28 erwiesen sich dafür als untauglich. Bei insgesamt 44 Transfers wurden 84 aufgetaute Embryonen im Blastocyststadium transferiert. Gut 50 % blieben somit im Lauf dieser Studie eingefroren, bzw. wurden nicht gebraucht! Die Schwangerschaftsrate betrug durchschnittlich 18,2 % und die Implantationsrate 11.9 %. Es wurden 1-4 Embryonen pro Transfer verpflanzt. Über Geburten wird nicht berichtet. 

Damit ist ein Verstoss gegen die Bundesverfassung von Art. 119 Abs. 2 Bst. c eindeutig belegt.

Bisher wurde behauptet, es würden von den befruchteten Eizellen, die 16 bis 20 Stunden nach der Behandlung die Befruchtungskontrolle unter dem Lichtmikrosokop überstehen, nur maximal drei zu Embryonen weiterentwickelt und der Frau transferiert, während die anderen im Vorkernstadium eingefroren würden. Das ist hier offensichtlich nicht der Fall.
Meistens werden den Frauen Embryonen im Zwei- bis Vier-Zellstadium verpflanzt. Die überzähligen Embryonen wurden im vorliegenden Fall mehrere Tage über dieses Stadium hinaus weiterentwickelt.
Bei diesem Forschungsprojekt geht es wohl darum, herauszufinden, ob generell die Embryonen bis in dieses Stadium entwickelt und dann verpflanzt werden könnten. Damit könnte eine höhere Implantationsrate erzielt werden, hingegen muss man bei der tagelangen In-vitro-Kultivierung den Tod von über 50% der Embryonen in Kauf nehmen. Hier wird durch die lange  In-vitro-Kultivierung bewusst die Selektion der weniger tauglichen Embryonen betrieben (gemäss Autoren S. 680!) - nur die überlebensfähigsten Embryonen werden transferiert.
Allerdings ändert sich offenbar wegen der In-vitro-Selektion das Geschlechtsverhältnis signifikant. Normalerweise ist das Verhältnis 51,7 % männlich zu 48,3 % weiblich. Nach Blastocystentransfer ergab sich ein Verhältnis von 71,4 % männlich zu 28,6 % weiblich!

(Quintans C.J., Donaldson M.J., Blanco L.A., Pasqualini R.S., Deviation in Sex Ratio after Selective Transfer of the Most Developed Cocultured Blastocysts: J Assist Reprod Genet 15 (1998) 403-404.)

AN: ZH028-0033See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: The rate of development and time of transfer play different roles in influencing the viability of human blastocysts

AU: Shoukir-Y; Chardonnens-D; Campana-A; Bischof-P; Sakkas-D

RP: Sakkas, D; HOP CANTONAL UNIV GENEVA; CLIN STERIL AND ENDOCRINOL GYNECOL, LAB GAMETES, 30 BD CLUSE; CH-1211 GENEVA; SWITZERLAND

IN: UNIV HOSP GENEVA, DEPT OBSTET AND GYNAECOL, CLIN INFERTIL AND GYNAECOL ENDOCRINOL, WHO, GENEVA, SWITZERLAND

SO: HUMAN-REPRODUCTION. MAR 1998; 13 (3) : 676-681

DT: Article
PY: 1998
IS: 0268-1161
LA: English

AB: Improved embryo culture protocols now render more feasible the possibility of obtaining human blastocysts after in-vitro fertilization. In this study we present: (i) results of blastocyst development from supernumerary embryos after co-culture on green monkey kidney epithelial cells and (ii) pregnancy rates after transfer of frozen blastocysts. In addition, we have examined the influence of the day of blastocyst freezing and the day of transfer after the luteinizing hormone (LH) peak on pregnancy and implantation rates. Of 423 supernumerary embryos, 200 developed to the blastocyst stage (47.3%), By days 5 and 6, 67% of the blastocysts had reached the blastocyst stage, and were frozen, compared to 28.5% by day 7. When we compared the cases where only blastocysts frozen on days 5 and 6 were transferred compared to those frozen and transferred on or after day 7 the pregnancy rates were 7/18 (38.9%) and 1/16 (6.2%) respectively. In contrast, when we examined the influence of the day of transfer we found that pregnancies were established from day 5 up to day 9 post LH peak. Based on these results, we suggest that every attempt should be made to increase the development rate of supernumerary embryos to the blastocyst stage, as it appears that the quality of blastocysts transferred, as shown in this study by rate of development, plays a more crucial role than the timing of transfer.

AI: Yes
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KA: blastocysts-; human-; in-vitro-fertilization; transfer-; viability-
KP: IN-VITRO-FERTILIZATION; HUMAN-EMBRYOS; DEVELOPMENT-INVITRO; GRANULOSA-CELLS; VERO-CELLS; COCULTURE-; CRYOPRESERVATION-; IMPLANTATION-; IMPROVEMENT-; QUALITY-
CC: Clinical-Medicine; Life-Sciences
RF: 35
GA: ZH028
UD: 199819
JN: HUM REPROD

   

Embryo im Blastozyststadium ca. 6 TageDefinitiver Befund nach Durchsicht des Originalartikels:

Die vorliegende Studie wurde mit Paaren durchgeführt, welche sich dem IVF-Programm an der Klinik des Universitätsspitals von Genf unterzogen. Die Studie bezieht sich auf die Zeit von April 1992 bis August 1997. Sie basiert vermutlich z.T. auf dem selben Zahlenmaterial wie die vorhergehende Studie. Im Rahmen von routinemässig durchgeführten IVF- und ICSI-Behandlungen mit Embryotransfer wurden insgesamt 293 Embryonen überzählig. Nach IVF entwickelten sich aus 173 Embryonen nur 85 zum Blastocyststadium (5 bis 7 Tage in Kultur). 50.9% gingen somit zugrunde. Bei ICSI war der Verlust noch grösser. Von 120 Embryonen überlebten 89 das Kultivierungsexperiment nicht, was somit 74.2 % Verlust entspricht. Die überlebenden Embryonen wurden eingefroren und teilweise für spätere Transfers verwendet.

Damit ist ein Verstoss gegen die Bundesverfassung von Art. 119 Abs. 2 Bst. c eindeutig belegt.

AN: 121TV-0044See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: Blastocyst development from supernumerary embryos after intracytoplasmic sperm injection: a paternal influence?

AU: Shoukir-Y; Chardonnens-D; Campana-A; Sakkas-D

RP: Sakkas, D; BIRMINGHAM WOMENS HOSP; ASSISTED CONCEPT UNIT; BIRMINGHAM B15 2TG; W MIDLANDS; ENGLAND

IN: UNIV HOSP GENEVA, DEPT OBSTET AND GYNAECOL, CLIN INFERTIL AND GYNAECOL ENDOCRINOL, WHO, CH-1211 GENEVA, SWITZERLAND

SO: HUMAN-REPRODUCTION. JUN 1998; 13 (6) : 1632-1637

DT: Article
PY: 1998
IS: 0268-1161
LA: English

AB: The success of intracytoplasmic sperm injection (ICSI) warrants further study on the role of paternal factors in early human embryogenesis. To investigate whether poor sperm parameters can influence embryo development, we examined the development of ICSI-fertilized embryos to the blastocyst stage. We present results of blastocyst development from supernumerary ICSI embryos after coculture on monkey kidney epithelial cells. In addition, we compare the development of supernumerary embryos to the blastocyst stage after ICSI and in-vitro fertilization (IVF). Of 168 supernumerary ICSI embryos, 45 (26.8%) developed to blastocysts. Sperm concentration and morphology did not influence blastocyst development. In contrast, blastocysts arose from spermatozoa that had a significantly higher (P = 0.015) forward progressive motility compared with spermatozoa from those patients who failed to produce blastocysts (42.7% versus 28.2%, respectively). Overall the rate of embryo development to the blastocyst stage after ICSI was lower (26.8%) than that after IVF (47.3%). When the rate of blastocyst development was calculated for patients with three or more supernumerary embryos, it remained significantly higher for the IVF patients than for the ICSI patients (45.6% versus 30.0%). There was no significant difference in the mean cell number and quality of the supernumerary embryos between the IVF and ICSI patients. This study confirms previous reports that have postulated that abnormal spermatozoa may manifest a negative paternal effect on preimplantation embryo development.

AI: Yes
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KA: human-blastocysts; ICSI-; in-vitro-fertilization; paternal-influence
KP: IN-VITRO-FERTILIZATION; SPERMATOZOA-; OOCYTES-; INSEMINATION-; EXPERIENCE-; CHROMATIN-; QUALITY-; HUMANS-; BIRTH-; GENE-
CC: Clinical-Medicine; Life-Sciences
RF: 38
GA: 121TV
UD: 199842
JN: HUM REPROD

   

Embryo im Blastozyststadium ca. 6 TageDefinitiver Befund nach Durchsicht des Originalartikels: Sakkas et al. verweisen in dieser Publikation, dass sie in Genf offenbar schon 1994 ähnliche Versuche mit überzähligen Embryonen bis ins Blastocyststadium durchgeführt haben, wie hier belegt wird. Insgesamt wurden 168 überzählige Embryonen nach ICSI zum Blastocyststadium (5 bis sieben Tage lang ) kultiviert, wobei lediglich 26.8% überlebten. Von 423 überzähligen Embryonen nach IVF erreichten 47.3% das Blastocyststadium.

Das ist ein eindeutiger Verstoss
gegen die Bundesverfassung Art. 119 Abs. 2 Bst. c

Es werden hier teilweise die gleichen Zahlen angegeben, wie in den obigen aufgeführten Abstracts von

HUMAN-REPRODUCTION. MAR 1998; 13 (3) : 676-681
HUMAN-REPRODUCTION. JUN 1998; 13 (6) : 1632-1637

 

AN: 0000788249-0003See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: Sperm nuclear DNA damage and altered chromatin structure: effect on fertilization and embryo development

AU: Sakkas-D; Urner-F; Bizzaro-D; Manicardi-G; Bianchi-PG; Shoukir-Y; Campana-A

RP: Sakkas, D; Birmingham Womens Hosp; Assisted Concept Unit; Birmingham B15 2TG; W Midlands; England

IN: Univ Hosp Geneva, Dept Obstet & Gynaecol, WHO,Clin Infertil & Gynaecol Endocrinol, Collaborating Ctr Human Reprod, Geneva, Switzerland; Univ Modena, Dept Anim Biol, I-41100 Modena, Italy

SO: HUMAN-REPRODUCTION. DEC 1998; 13 Suppl. 4 : 11-19

DT: Article
PY: 1998
IS: 0268-1161
LA: English

AB: In the first part of this report we investigate whether chromatin anomalies in human spermatozoa can influence fertilization after intracytoplasmic sperm injection (ICSI). We have examined the sperm chromatin packaging quality using the chromomycin A(3) (CMA(3)) fluorochrome and the presence of DNA damage in spermatozoa using in-situ nick translation. When comparing the spermatozoa of patients undergoing in-vitro fertilization (IVF) and ICSI distinct differences are evident in that ICSI males have a higher CMA(3) fluorescence, indicating spermatozoa with loosely packed chromatin, and more spermatozoa containing endogenous DNA nicks. When examining the unfertilized oocytes of ICSI patients we found that men who had a high percentage of anomalies in their chromatin, i.e. >30% CMA(3) fluorescence and >10% nicks, had more than double the number of unfertilized oocytes containing spermatozoa that had remained condensed. The observation that failed fertilized oocytes, injected with spermatozoa from patients with a higher percentage of sperm nuclear anomalies, contain more condensed spermatozoa indicates that a selection process against these spermatozoa may be in place at the time of fertilization. In the second part of the study we show that spare ICSI embryos have significantly lower rates of development to the blastocyst stage compared with those developed after routine IVF. These results show that a greater understanding of the molecular basis of male infertility is therefore needed to broaden our knowledge on the effect that abnormal spermatozoa have on fertilization and embryo development.

AI: Yes
JS: REPRODUCTIVE-MEDICINE; MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS
KA: fertilization-; intracytoplasmic-sperm-injection; male-infertility; sperm-chromatin; sperm-nuclear-decondensation
KP: PATERNAL-CYCLOPHOSPHAMIDE-TREATMENT; HUMAN-SPERMATOZOA; STRAND-BREAKS; IN-VITRO; INJECTION-; DECONDENSATION-; INFERTILITY-; RATS-; ACCESSIBILITY-; MALFORMATIONS-
CC: Clinical-Medicine; Life-Sciences
RF: 39
GA: 170UH
UD: 199912
JN: HUM REPROD

 

   

Die vorliegende Studie wurde mit Paaren durchgeführt, welche sich dem IVF-Programm an der Klinik des Universitätsspitals von Genf unterzogen. Die Studie bezieht sich auf die Zeit von Oktober 1994 bis März 1997. Bemerkenswert ist der offensichtlich enorme Verschleiss an gewonnenen Eizellen und Embryonen. Von 785 Eizellen wurden 678 mit einer Samenzelle injiziert. Daraus entwickelten sich 400 befruchtete Eizellen mit zwei Vorkernen - die anderen schieden aus. Daraus entwickelten sich Embryonen, von denen nur 243 in insgesamt 88 Transfer den Frauen übertragen. Über das Schicksal der restlichen 157 schweigt die Studie. Bezogen auf die Transfers ergab sich die klinische Schwangerschaftsrate (2/14) von 5.9 und 25.9 %, was einem Mittel von 18% pro Transfer entspricht. Pro transferierten Embryo ergäbe sich eine Rate von 6.6 %. Auf eine Angabe der Anzahl Geburten wurde verzichtet.

Angesichts des ungewissen Schicksals von 73 imprägnierten Eizellen und 84 (2-tägigen) Embryonen muss ein Verstoss gegen die Bundesverfassung Art. 119 Abs. 2 Bst. c naheliegen.

AN: ZA740-0039See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: Early cleavage of human embryos to the two-cell stage after intracytoplasmic sperm injection as an indicator of embryo viability

AU: Sakkas-D; Shoukir-Y; Chardonnens-D; Bianchi-PG; Campana-A

RP: Sakkas, D; HOP CANTONAL UNIV GENEVA; CLIN STERIL AND ENDOCRINOL GYNECOL, LAB GAMETES, 30 BD DE LA CLUSE; CH-1211 GENEVA; SWITZERLAND

IN: UNIV HOSP GENEVA, DEPT OBSTET AND GYNAECOL, WHO COLLABORATING CTR HUMAN REPROD, CH-1211 GENEVA, SWITZERLAND

SO: HUMAN-REPRODUCTION. JAN 1998; 13 (1) : 182-187

DT: Article
PY: 1998
IS: 0268-1161
LA: English

AB: In-vitro fertilization (IVF) embryos are selected for transfer on the basis of morphology and rate of development. However, when a number of embryos have similar characteristics, the selection of the best embryos is left to chance, Recently, we proposed a simple, novel method to overcome this problem, based on pre-selection of embryos cleaving early to the two-cell stage, In this study we have adopted the same method to choose embryos fertilized after intracytoplasmic sperm injection (ICSI), Fertilized embryos that had cleaved to the two-cell stage by 27 h post-injection were designated as 'early cleavage' embryos, while those that had not yet reached the two-cell stage were designated as 'no early cleavage', In all cases, the early cleavage embryos were transferred when available, Early cleavage was observed in 54 (61.4%) of the 88 cycles assessed, There were significantly (P = 0.04) more clinical pregnancies in the early cleavage group, 14/54 (25.9%), compared with the no early cleavage group 2/34 (3.2%), No differences between the groups were found when comparing key parameters (age, stimulation protocol and semen characteristics) of the couples, Using the ICSI technique, we have shown that early cleavage to the two-cell stage is not influenced by the timing of fertilization, and is more likely due to intrinsic factors within the oocyte or embryo that promote embryo cleavage after fertilization.

AI: Yes
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KA: early-cleavage; embryo-quality; intracytoplasmic-sperm-injection; viability-
KP: IN-VITRO; INVITRO-FERTILIZATION; PREIMPLANTATION-EMBRYOS; SUBZONAL-INSEMINATION; MOUSE-EMBRYOS; HUMAN-OOCYTES; QUALITY-; EXPRESSION-; PARAMETERS-; CULTURE-
CC: Clinical-Medicine; Life-Sciences
RF: 34
GA: ZA740
UD: 199814
JN: HUM REPROD

       
LAB ANALAT. AND QUANTITAT. CYTOL. GENF

Definitiver Befund nach Durchsicht des Originalartikels: Mit Sicherheit verbrauchende Embryonenforschung. Um das Verhalten bei der Einnistung zu untersuchen, wurde von sechs Frauen Gebärmutterschleimhaut entnommen. Diese wurde verwendet, um das Verhalten von sich einnistenden Embryonen  unter In-vitro-Bedingungen zu untersuchen. Die Publikation gilt als Pilot Studie für weitere Forschung bezüglich des Implantationsvorganges von menschlichen Embryonen. Es geht aus der Publikation nicht deutlich hervor, inwiefern das Labor in Genf an dieser Forschung beteiligt war. Es ist wahrscheinlich, dass die In-vitro-Versuche in Schweden durchgeführt wurden, während die histologische Untersuchung der Gebärmutterschleimhaut mit den eingenisteten Embryonen im Labor in Genf erfolgte.

AN: UF680-0035See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: A new method to study the process of implantation of a human blastocyst in vitro

AU: Landgren-BM; Johannisson-E; StavreusEvers-A; Hamberger-L; Eriksson-H

RP: Johannisson, E; LAB ANALYT AND QUANTITAT CYTOL; 45B ROUTE ACACIAS, CASE POSTALE 21; CH-1211 GENEVA; SWITZERLAND

IN: LAB ANALYT AND QUANTITAT CYTOL, CH-1211 GENEVA, SWITZERLAND; KAROLINSKA HOSP, DEPT WOMAN AND CHILD HLTH, S-10401 STOCKHOLM, SWEDEN; SAHLGRENS UNIV HOSP, DEPT OBSTET AND GYNECOL, GOTHENBURG, SWEDEN

SO: FERTILITY-AND-STERILITY. MAY 1996; 65 (5) : 1067-1070

DT: Article
PY: 1996
IS: 0015-0282
LA: English

AB: Objectives: To develop a ''miniorgan'' culture of human endometrium dated according to the LH peak in order to study the process of implantation of a human blastocyst in vitro.Design: Preliminary results of a more extensive study with the same objectives.Setting: Hospital-based unit of reproductive health and university-related reproductive research laboratories.Patients: Six apparently healthy women with normal regular menstrual cycles providing endometrial material 4, 5, and 6 days after the LH peak.Intervention: One part of the biopsy was used for histologic dating, The other part was incubated in culture medium RPMI-1640 and exposed to the contact with one to three embryos fertilized in vitro. Main Outcome Measure: Biopsy material before and after incubation was studied by morphometric methods in a light microscope. The histologic changes were recorded by photomicrographs.Results: Implantation of an embryo obtained 4 days after IVF penetrated the lining endometrial epithelium of a biopsy obtained 4 days after the LH peak and kept in vitro for 24 hours. The embryo was placed on the lining epithelium of the endometrium within 3 hours after the biopsy was taken.Conclusion: A new method to study the process of implantation of a human embryo in vitro has been described, allowing the embryo to penetrate the lining endometrial epithelium in a biopsy obtained at LH +4/+5.

AI: Yes
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KA: mini-organ-culture; human-endometrium-dated-in-relation-to-the-LH-peak; embryos-fertilized-in-vitro
KP: INVITRO-; WOMEN-
CC: Clinical-Medicine; Life-Sciences
RF: 6
GA: UF680
UD: 199600
JN: FERT STERIL

         
Frauenklinik des Universitätsspitals in Zürich

2-ZellembryoDefinitiver Befund nach Durchsicht des Originalartikels: 30-38 % der aufgetauten imprägnierten Eizellen wurden zwar bis zum mehrzelligen Embryo kultiviert, aber wegen ihrer mangelhaften Qualität nicht transferiert. Wollte Art. 119 der Bundesverfassung dies nicht verhindern?

AN: ZF654-0004See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: Impairment of the developmental potential of frozen-thawed human zygotes obtained after intracytoplasmic sperm injection

AU: Macas-E; Imthum-B; Borsos-M; Rosselli-M; MaurerMajor-E; Keller-PJ

RP: Macas, E; UNIV ZURICH HOSP; ENDOCRINOL CLIN, DEPT GYNECOL AND OBSTET, FRAUENKLIN STR 10; CH-8091 ZURICH; SWITZERLAND

SO: FERTILITY-AND-STERILITY. APR 1998; 69 (4) : 630-635

DT: Article
PY: 1998
IS: 0015-0282
LA: English

AB: Objective: To evaluate the effects of cryopreservation on the survival, cleavage, and morphology of embryos and on the implantation and embryonic loss rates of human zygotes obtained after ICSI compared with frozen-thawed zygotes obtained after traditional IVF. A further objective was to evaluate the same parameters in nonfrozen sibling ICSI and IVF zygotes and to compare them with corresponding frozen-thawed zygotes.Design: Open, retrospective, comparative study.Setting: University-associated assisted reproductive program.Patient(s): Couples with severe male factor infertility and couples undergoing IVF during the same period.Intervention(s): A cohort of 408 ICSI zygotes and 299 IVF zygotes was frozen in 1,2 propanediol and sucrose using a slow-freezing protocol. Both groups of zygotes were frozen at approximately the same time after microassisted or conventional insemination. One hundred and eighty-seven ICSI and 110 IVF frozen zygotes were rapidly thawed during 44 ICSI cycles and 24 IVF cycles. Zygotes that appeared to have survived were cultured for 24 hours, and most of these embryos that were morphologically normal were transferred into patients. Main Outcome Measure(s): Survival rate (morphologically intact after thawing), cleavage rate and morphology of embryos, implantation rate, and the incidence of embryonic losses.Result(s): Except for survival rates, for which both ICSI and IVF frozen-thawed zygotes showed similar and relatively high values (87.7% and 89.1%), the outcomes of other parameters evaluated were significantly different. Thus, from a total of 128 ICSI and 68 IVF embryos transferred, 14 (10.9%) and 17 (25.0%) implanted in 44 ICSI and 24 IVF frozen-thawed cycles, respectively. This difference in implantation corresponded with the rate of cleavage and morphology of the replaced embryos: the embryos that developed from frozen-thawed IVF zygotes cleaved faster and were more regular compared to the frozen-thawed ICSI zygotes. Main Outcome Measure(s): Survival rate (morphologically intact after thawing), cleavage rate and morphology of embryos, implantation rate, and the incidence of embryonic losses.Result(s): Except for survival rates, for which both ICSI and IVF frozen-thawed zygotes showed similar and relatively high values (87.7% and 89.1%), the outcomes of other parameters evaluated were significantly different. Thus, from a total of 128 ICSI and 68 IVF embryos transferred, 14 (10.9%) and 17 (25.0%) implanted in 44 ICSI and 24 IVF frozen-thawed cycles, respectively. This difference in implantation corresponded with the rate of cleavage and morphology of the replaced embryos: the embryos that developed from frozen-thawed IVF zygotes cleaved faster and were more regular compared to the frozen-thawed ICSI zygotes. The embryonic loss rate was 57.1% for cryopreserved ICSI zygotes and 11.8% for IVF zygotes. On the other hand, no difference in cleavage pattern, embryo morphology, implantation and embryonic loss rates was found between nonfrozen sibling ICSI and IVF zygotes.Conclusion(s): The zygotes arising from ICSI cycles survived cryopreservation at a rate similar to IVF zygotes, but their ability to implant and develop further was probably affected by the cryopreservation procedure. The timing of zygote freezing was considered to be the principal reason for the lower developmental potential of frozen-thawed ICSI zygotes in the present study. (C) 1998 by American Society for Reproductive Medicine.

AI: Yes
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KA: intracytoplasmic-sperm-injection; in-vitro-fertilization; cryopreservation-; human-zygotes
KP: PREGNANCY-RATES; HUMAN-EMBRYOS; CRYOPRESERVATION-; FERTILIZATION-; OOCYTES-; PRONUCLEATE-
CC: Clinical-Medicine; Life-Sciences
RF: 19
GA: ZF654
UD: 199818
JN: FERT STERIL

   

Status: Forschung an überzähligen abnormalen imprägnierten Eizellen - wird von Art. 119 BV und Fortpflanzungsmedizingesetz leider nicht verhindert.

AN: WA428-0039See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: The chromosomal complements of multipronuclear human zygotes resulting from intracytoplasmic sperm injection

AU: Macas-E; Imthurn-B; Rosselli-M; Keller-PJ

RP: Macas, E; UNIV ZURICH HOSP; DEPT OBSTET AND GYNAECOL, DIV ENDOCRINOL, FRAUENKLIN STR 10; CH-8091 ZURICH; SWITZERLAND

SO: HUMAN-REPRODUCTION. NOV 1996; 11 (11) : 2496-2501

DT: Article
PY: 1996
IS: 0268-1161
LA: English

AB: Implementation of intracytoplasmic sperm injection (ICSI) in human in-vitro fertilization (IVF) has highlighted the need for information about the risk of nuclear spindle damage caused by this procedure. For this purpose we studied the final products of oocyte meiosis at the first cleavage division of multipronuclear zygotes arising after ICSI, and compared the results with abnormally fertilized oocytes after conventional in-vitro insemination. Of 37 successfully analysed tripronuclear zygotes, 18 had three individual metaphases. Abnormal complements of II zygotes in this group indicated that non-disjunction occurred predominantly at the second meiotic division of the oocytes. Nine of the 37 tripronuclear zygotes exhibited two individual metaphases. Seven were abnormal and there were some indications that non-disjunction took place during oocyte meiosis. Of the 37 tripronuclear zygotes, 10 had a single metaphase and three showed an aneuploid number of chromosomes. The overall rate of aneuploidy among tripronuclear microinjected zygotes was 56.7%. In addition, seven zygotes with more than three pronuclei arising after ICSI displayed severely depleted chromosome complements. The incidence of non-disjunction in oocytes fertilized by conventional in-vitro insemination was significantly lower (20.0%, P < 0.01), since only four zygotes had an aneuploid number of chromosomes. Our findings suggest that ICSI might interfere with regular chromosome segregation at the second meiotic division of the oocytes.

AI: Yes
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KA: cytoskeleton-; human-chromosomes; intracytoplasmic-sperm-injection; multipronuclear-zygotes
KP: HUMAN-OOCYTES; INVITRO-FERTILIZATION; POLYSPERMY-; DISORDERS-; EMBRYOS-;
SUCCESS-; ICSI-
CC: Clinical-Medicine; Life-Sciences
RF: 23
GA: WA428
UD: 199700
JN: HUM REPROD

         

Definitiver Befund nach Durchsicht des Originalartikels: 

Es handelt sich hier an sich lediglich um eine Antwort auf eine Anfrage bezüglich der obigen Publikation der selben Autoren (Human Reproduction 11 (1996) 2496-2501). Wenig ethisches "Fingerspitzengefühl" beweisen sie, indem sie auf andere cytogenetische Modelle zur Untersuchung der Abnormalität von menschlichen Spermien hinweisen: Das Einspritzen solcher Samenzellen in Hamstereizellen mit anschliessender Kontrolle des Verschmelzungsproduktes. Diese Methode ist in der Schweiz gemäss der Schweizer Bundesverfassung verboten, wird aber im Ausland praktiziert. Art. 119 Abs. 2 Bst. b lautet: "Nichtmenschliches Keim- und Erbgut darf nicht in menschliches Keimgut eingebracht oder mit ihm verschmolzen werden."

AN: XV356-0049See Contents-Page
RT: Bibliographic-Record
PT: Journal

TI: Chromosomes of multipronuclear zygotes resulting from ICSI

AU: Macas-E; Imthurn-B; Rosselli-M; Keller-PJ

RP: Macas, E; UNIV ZURICH HOSP; DEPT GYNECOL AND OBSTET, DIV ENDOCRINOL, FRAUENKLINIKSTR 10; CH-8091 ZURICH; SWITZERLAND

SO: HUMAN-REPRODUCTION. JUL 1997; 12 (7) : 1600-1600

DT: Letter
PY: 1997
IS: 0268-1161
LA: English
AI: No
JS: MEDICAL-RESEARCH,-ORGANS-AND-SYSTEMS; REPRODUCTIVE-MEDICINE
KP: FERTILIZED-INVITRO; EMBRYOS-
CC: Clinical-Medicine; Life-Sciences
RF: 4
GA: XV356
UD: 199700
JN: HUM REPROD

        
Homepage HLI-Schweiz

zurück