Talk:Zygote

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Note - This sub-heading shows an automated computer PubMed search using the listed sub-heading term. References appear in this list based upon the date of the actual page viewing. Therefore the list of references do not reflect any editorial selection of material based on content or relevance. In comparison, references listed on the content page and discussion page (under the publication year sub-headings) do include editorial selection based upon relevance and availability. (More? Pubmed Most Recent)

Zygote Development

<pubmed limit=5>Zygote Development</pubmed>

Zygote

<pubmed limit=5>Zygote</pubmed>

2011

Barr body, polar bodies and Balbiani body; and the male sex body and chromatoid body.

Journal - Zygote Zygote An international journal dedicated to the rapid publication of original research in early embryology, Zygote covers interdisciplinary studies in animals and humans, from gametogenesis through fertilization to gastrulation.

References

Is pronuclear scoring a really good predictor for ICSI cycles?

Gynecol Endocrinol. 2010 Sep 1.

Aydin S, Cinar O, Demir B, Korkmaz C, Ozdegirmenci O, Dilbaz S, Goktolga U.

Center for Assisted Reproductive Medicine and IVF, Etlik Zubeyde Hanim Women's Health Teaching and Research Hospital, Ankara 06010, Turkey. Abstract Background/Aims. Since the assessments of the morphology of oocytes, zygotes and/or embryos are of crucial importance to select the best candidate for pregnancy, many morphological evaluation tools have been proposed. Although embryo scoring, particularly cleavage and blastocyst stages, is more convincing due to successful results, zygote scoring still have a bias as different outcomes. In the current study, we designed a prospective study to test the reliability of zygote scoring by focusing on zygote evaluation techniques and its relation with embryo development and embryo selection for transfer. Methods. A total of 1215 mature oocytes from 139 couples were evaluated for the study. Results. There is no correlation between published zygote scoring technique and embryo development. Conclusions. We conclude that the inconsistency of data obtained from zygote scoring might be caused by the static nature of pronuclear stage embryos and thus pronuclear scoring seems to be unreliable evaluation technique for embryo selection.

PMID 20807168

Number of blastomeres and distribution of microvilli in cloned mouse embryos during compaction

Zygote. 2010 Aug 25:1-6.

Li CB, Wang ZD, Zheng Z, Hu LL, Zhong SQ, Lei L.

Department of Histology and Embryology, Harbin Medical University, Harbin, China. Abstract SummaryThe events resulting in compaction have an important influence on the processes related to blastocyst formation. To analyse the quality of the embryos obtained by somatic cell nuclear transfer (SCNT) in aspects different from previous studies, not only the number of blastomeres of cloned embryos during the initiation of compaction, but also the distribution of microvilli in cloned, normal, parthenogenetic, and tetraploid embryos before and after compaction was preliminarily investigated in mouse. Our results showed that during compaction the number of blastomeres in SCNT embryos was fewer than that in intracytoplasmic sperm injection (ICSI) embryos and, before compaction, there was a uniform distribution of microvilli over the blastomere surface, but microvilli became restricted to an apical region after compaction in the four types of embryos. We also reported here that the time course of compaction in SCNT embryos was about 3 h delayed compared with that in ICSI embryos, while there was no significant difference between SCNT and ICSI embryos when developed to the 4-cell stage. We concluded that: (i) the cleavage of blastomeres in cloned embryos was slow at least before compaction; (ii) the distribution of microvilli in cloned, normal, parthenogenetic, and tetraploid embryos was coherent before and after compaction; and (iii) the initiation of compaction in SCNT embryos was delayed compared with that of ICSI embryos.

PMID 20735894

Association of distributions of three types of germinal vesicle stage oocytes with the canine follicle location in the ovary

Zygote. 2010 Jul 21:1-5. Wang LX, Wang S, Hou J, Hu RL, An XR.

State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100094, China. Abstract SummaryThe objective of current study was to compare the nuclear configurations of canine oocytes recovered from between follicles after isolation. Follicles isolated were classified into follicle-S (follicles located in the ovarian surface) and follicle-I (follicles located inside the ovary) based on the follicle location in the ovary. Nuclear stages of canine oocytes recovered from follicle-S and follicle-I were examined by phase-contrast microscopy after isolation. Results demonstrated that canine GV stage oocytes can be classified into three types based on the status of the nuclear envelope, nucleolus, and chromatin: type A, type B, and type C. In follicle-S group, the majority (95.5%) of canine GV stage oocytes was of type B. All canine GV stage oocytes recovered from follicle-S (including type B and type C) were characterized by nuclear envelope disappearance prior to nucleolus collapse. In contrast, in follicle-I group, the majority (60.2%) of canine GV stage oocytes was of type C. Unexpectedly, a small proportion of canine GV stage oocytes from follicle-I (donated type A) were characterized by nuclear envelope disappearance following nucleolus collapse. In conclusion, nuclear configurations of each type of canine GV stage oocytes may differ from each other. Distributions of each type of canine GV stage oocytes may associate with the follicle location in the ovary.

PMID 20663264

Nucleologenesis and embryonic genome activation are defective in interspecies cloned embryos between bovine ooplasm and rhesus monkey somatic cells

Song BS, Lee SH, Kim SU, Kim JS, Park JS, Kim CH, Chang KT, Han YM, Lee KK, Lee DS, Koo DB. BMC Dev Biol. 2009 Jul 28;9:44. PMID 19635167

Species Comparison

Species	1 cell (hours)	8 cell (days)	Blastocyst (days)	Enter Uterus (days)	Length of Gestation (days)
Cattle	24	3	8	3.5	281
Horse	24	3	6	5	337
Sheep	24	2.5	7	3	148
Swine	14-16	2	6	2	114

(Data: Oklahoma State University Learning Reproduction in Farm Animals)

Rabbit

<pubmed>19245751</pubmed>

Fertilization - penetration of most ova during the first hour after ovulation.

1. 0-16 h - pronuclei
2. 16-22 h - 2 cell
3. 22-29 h - 4 cell
4. 29-32 h - 8 cell
5. 32-77h - morula
6. 77-98h - blastocyst
7. 98h + - hatching blastocyst

Species	Zygote	2 cell	4 cell	8 cell	Morula	Blastocyst	Hatching Blastocyst
Rabbit	0-16 h	16-22 h	22-29 h	29-32 h	32-77h	77-98h	98h +
Human	0-24 h	2 cell	4 cell	8 cell	76 h	96 h	120 h
Mouse	0-24 h	48 h	60 h	8 cell	72 h	96 h	Hatching Blastocyst
Species	Zygote	2 cell	4 cell	8 cell	Morula	Blastocyst	Hatching Blastocyst

Mouse

• Fertilized eggs, two-cell embryos, four-cell embryos, morulae, and blastocysts were collected [at 24, 48, 60, 72, and 96 hr

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC20520

• 26 h (2-cell), 42 h (4-cell), 51 h (8-cell), 69 h (morula), and 91 h (blastocyst)

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2757202