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 | | Blastomere suction is performed with a second needle, the biopsy needle, and the suction could be applied by mouth suction or using a microinjector. | | | In the most common technique, zona drilling with blastomere suction, a hole is made in the zona pellucida by using a hatching needle and blowing acidified Tyrode’s solution (pH 2.35). | | | While the first technique is difficult to learn for technicians not used to assisted hatching, the other two render the zona opening with hard edges that make more difficult the recovery of the blastomere and can more easily damage it. |
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http://www.worldivf.com/Info_Articles/PGD.htm
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| | lifeissues.net What Human Embryo? |
| | Blastomere removal and addition experiments have convincingly demonstrated the regulative nature (i.e., the strong tendency for the system to be restored to wholeness) of early mammalian embryos. | | | Although this hypothesis has been supported by a variety of experiments, the mechanisms by which the blastomeres recognize their positions and then differentiate accordingly have remained elusive and are still little understood. | | | Human embryologist, Bruce Carlson: "Of the experimental techniques used to demonstrate regulative properties of early embryos, the simplest is to separate the blastomeres of early cleavage-stage embryos and determine whether each one can give rise to an entire embryo. |
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http://www.lifeissues.net/writers/irv/irv_82whathumanembryo3.html
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| | Cross-coupling between voltage-dependent Ca2+ channels and ryanodine receptors in developing ascidian muscle ... |
| | Blastomeres were depolarized repeatedly (a 400 ms depolarizing pulse every 3 s, 80 times) and VDCC currents at each stimulation were monitored. | | | Recovery of the current amplitude in the immature blastomere was much slower than that in the differentiated one. | | | These similarities strongly suggest that essential mechanisms of E-C coupling in vertebrate cardiac muscle may be evolutionarily conserved in ascidian muscles. |
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http://jp.physoc.org/cgi/content/full/515/3/695
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| | Lecture: Developmental Potential |
| | There is a 1 to 1 correlation of color of cytoplasm in a blastomere and its specific development fate. | | | You have to be careful when talking about the fate of these blastomeres. | | | He used a glass needle and separated the first 4 blastomeres. |
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http://morgan.botany.uga.edu/devbio/syllabus/lecdevpot.htm
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| | eMedicine - Preimplantation Genetic Diagnosis : Article by JJ Marik, MD |
| | The embryation pipette is placed through this opening and focused on the blastomere of choice, which should contain a visible nucleus. | | | To the lower-left side is the holding pipette, and to the right side is the glass needle used for aspiration of the blastomere. | | | A 16- to 17-gauge needle is typically used for transvaginal aspiration of the follicles under ultrasound control. |
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http://www.emedicine.com/med/topic3520.htm
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| | Reprogenetics: Everything associated with PGD: preimplantation genetic diagnosis - pgd |
| | It is important to note that some of our protocols are experimental and are supervised by the Internal Review Board of Reprogenetics. | | | Embryos that are revealed to be healthy can be transferred to the womb, ultimately producing unaffected babies. | | | The embryo is placed in an incubator while the cell is analyzed. |
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http://www.reprogenetics.com/pgd_monogenic.html
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| | Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations |
| | According to the blastomere analysis, one embryo was haploid, one tetraploid. | | | Energy Citations Database (ECD) Document #133441 - Pre-implantation diagnosis of aneuploidy by polar body and blastomere FISH analysis | | | This can be substituted by initial FISH analysis of the first polar body (PB) and subsequent single blastomere analysis. |
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http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=133441
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| | Gross and Levitt |
| | For an article on this technique and its implications, see Shushan and Schenker, 1993. | | | For an article on this technique, see Peter et al., 1993. | | | The blastomeres of the early human embryo can regulate if one of them is removed. |
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http://zygote.swarthmore.edu/fert11b.html
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| | The Kentucky Center for Reproductive Medicine and IVF - Preimplantation Genetic Diagnosis |
| | Although irrelevant to blastomere biopsy work, a correlation has been observed between mosaicism as identified by FISH, and that analyzed through karyotyping of amniotic cells. | | | Typically, 1 or 2 blastomeres are removed for analysis. | | | Future applications even suggest the culturing of biopsied blastomeres for more exhaustive diagnostics. |
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http://www.kcrm-ivf.com/pgd.htm
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| | The Cloning Process |
| | The most popular of these are the Nuclear Transfer and the Blastomere Separatio n techniques. | | | For fear that the Nuclear Transfer technique continues to be inefficient, scientists have designed a new technique, Blastomere Separation, with the sole purpose of cloning human beings. | | | Even if neither the Nuclear Transfer nor the Blastomere Separation techniques prove successful, eventually the scientific community will control the human cloning technology, and the world will have to be ready for it. |
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http://www.cs.virginia.edu/~jones/tmp352/projects98/group9/tcp.html
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| | Untitled Document |
| | For a more detailed look at the processes of germline gene therapy, visit one of the following links: Germline therapy in the egg or sperm, Germline therapy with the blastomere, and the Lab Processes of Germline therapy. | | | The goal of germline gene therapy is to effect changes in the genetic code of an organism that will be passed on to future generations. | | | Another method of germline gene therapy involves altering the genetic makeup of some of the cells of the blastomere when it is at a very early stage of development. |
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http://www.brown.edu/Courses/BI0032/gentherp/IIIABC.htm
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| | Preimplantation Genetic Diagnosis (PGD) Article |
| | Sometimes, for technical reasons, the polar body biopsy does not provide clear information regarding aneuploidy, and a blastomere biopsy may be performed to clarify the results. | | | Therefore, blastomere biopsy may need to be performed as a second step. | | | Because polar body biopsy only analyzes the maternal contribution of the DNA, this technique cannot determine whether the resulting embryo would be normal or a carrier of the disease. |
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http://www.fertilitynetwork.com/articles/articles-pgd.htm
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| | Faculty Information for James Priess |
| | Our second major interest is in the molecular basis of cell-cellinteractions that are involved in specifying the fates of a differentsubset of early embryonic blastomeres. | | | We use the nematode Caenorhabditis elegans as a modelsystem for studying this problem. | | | We have identified several additional genes thatappear to function in this signaling pathway, and we are trying toanalyze how this works at the molecular level. |
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http://depts.washington.edu/mcb/facultyinfo.php?id=125
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| | SIRM: PRE IMPLANTATION GENETIC DIAGNOSIS (PGD): A COMMENTARY ON ITS UTILITY AND POTENTIAL VALUE |
| | Embryos or oocytes are biopsied during culture in vitro and chromosomal/genetic analysis is carried out on material derived from polar body(ies) and/or blastomere(s). | | | Certain structural aneuploidies such as occurs with selective translocations can also be diagnosed in this way. | | | The thought is that because the latter requires penetrating the viteline membrane with a relatively large bore needle to remove one or more cells for assessment, traumatizes the embryo, blastomere biopsy could be more likely than polar body biopsy to impair the subsequent implantation potential of even ‘normal” (euploid) post-biopsied embryos. |
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http://www.haveababy.com/news/pgd.asp
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| | Cloners in State of Complete Moral Disconnect |
| | One of the techniques he is referring to however, “blastomere separation,” is more commonly called twinning. | | | The technique solves no ethical dilemmas since it starts with cloning and creates an entity, the blastomere, that may itself be a human embryo. | | | This twinning process in the IVF industry is a form of human cloning. |
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http://www.lifesite.net/ldn/2005/jun/05060809.html
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| | lecture26 |
| | Genetic analysis of maternal effect mutants is beginning to provide information on the molecular nature of the cytoplasmic determinants that specify blastomere identities and how they are segregated during early cleavage. | | | This demonstrated that these two blastomeres had the same potential, but were signaled to take on different fates because of their position in the embryo. | | | This is an important first step in defining and characterizing the genes that control embryonic development. |
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http://beagle.colorado.edu/courses/4650/lecture26.html
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| | PGD, Preimplantation Genetic Diagnosis, Pre Implantation Genetic Diagnosis, IVF PGD |
| | Mosaicism can affect the results of PGD when blastomere biopsy is performed. | | | The next phase of the preimplantation genetic diagnosis process is called a blastomere biopsy | | | During this time, the cells that were removed from the developing embryo and specifically the genetic material inside of the cells can be tested for various abnormalities or characteristics. |
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http://www.ivf1.com/pgd
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| | Untitled Document |
| | As we have previously discussed, when we do germline gene therapy we can work with the blastomere or work directly with the egg or sperm. | | | The other way to do germline gene therapy is to work with the cells of a very early blastomere, known as embryonal stem cells. | | | At this point in their life cycle, they will be receptive to whatever genetic modification one wishes to subject them to, and they will pass it onto all their daughter cells. |
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http://www.brown.edu/Courses/BI0032/gentherp/IIIB12.htm
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| | Standard and Polar Body Biospy Micropipets |
| | To view the Blastomere and Polar Body pages from our catalog, click here. | | | Blastomere Biopsy micropipets may be ordered straight or with an angle. | | | You may specify a different diameter by ordering a customized Blastomere Biopsy micropipet. |
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http://www.humagenivf.com/Biopsy_Micropipets.htm
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| | Fanconi Anemia - Preimplantation Genetic Diagnosis (PGD) |
| | Of those, the analysis technique was successful in 255 of those 266 (testing yield of 255/266 = 95.9%). | | | Your PGD provider will develop a system which combines a biopsy strategy (polar bodies, blastomeres), and an analysis strategy (using a combination of FISH and/or PCR) to achieve the analysis result you need. | | | That is, if you remove a blastomere or two from an eight-cell human embryo, it will continue to develop into an embryo, then a fetus, and finally a baby. |
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http://members.cox.net/amgough/Fanconi-genetics-PGD.htm
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| | Swemed follicle aspiration micromanipulation pipettes embryo transfer catheter assisted reproduction supplier |
| | Swemed Lab Assisted reproduction, micromanipulation, microtools, denudation, ICSI, holding, hatching, pzd, blastomere biopsy, embryo, cellknife, stemcell, follicleaspiration, aspiration, aspiration needles, IVF, gynecology, ultrasound, infertility, cyst puncture | | | Swemed follicle aspiration micromanipulation pipettes embryo transfer catheter assisted reproduction supplier |
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http://www.swemed.com
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| | Medical Tests: Blastomere analysis before implantation - WrongDiagnosis.com |
| | Conditions list: The following list of conditions have 'Blastomere analysis before implantation' or similar listed as a test in our database: | | | Condition count: 4; see list of conditions below. | | | We show you all these ads in order to provide this free site; give your feedback. |
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http://www.wrongdiagnosis.com/test/blastomere_analysis_before_implantation.htm
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| | Australasian Bioethics Information |
| | Each cell, called a blastomere, is totipotent, that is, it can grow into an individual organism. | | | The problem was that the nuclei from embryos which had developed beyond a certain number of cells seemed to lose their totipotency. | | | They had already differentiated and specialised into specific tissue such as muscle, bone or neurons, and could not revert to the totipotency of blastomere cells. |
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http://www.australasianbioethics.org/Media/RTL092001.html
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| | Developmental Biology Online: The Cell Surface and the Mechanism of Compaction |
| | These microvilli may be the sites where E-cadherin is functioning to mediate intercellular adhesion. | | | This cell usually produces the first pair of blastomeres to reach the 8-cell stage, and these cells usually divide in such a way that they are inside the loosely aggregated cluster of blastomeres (Graham and Kelly, 1977). | | | The flattening of the blastomeres against one another may therefore be brought about by the shortening of the microvilli through actin depolymerization (Pratt et al., 1982; Sutherland and Calarco-Gillam, 1983). |
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http://www.devbio.com/article.php?ch=11&id=104
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| | Alterations in spiralians |
| | Proposed model of Martindale and Henry to explain for discrepencies between molluscan and nemertean blastomere isolation experiments. | | | The posterior structures are generated from the D blastomere which also gives rise to the visceral mesoderm (and organizes early development as mentioned in the text). | | | This places the eye determinants in different blastomeres and causes some of the eye determinants to be in the same cell (RD) that gives rise to some of the posterior cells. |
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http://zygote.swarthmore.edu/cyto3.html
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| | MSN Encarta - Print Preview - Cloning |
| | Scientists found that such embryo cells are totipotent (able to give rise to all the different cell types in the body). | | | Scientists then put each blastomere in culture, where it forms an embryo containing the same genetic makeup as the original embryo. | | | In this technique, scientists transfer the genetic material from a donorâs somatic cell (any body cell other than an egg or sperm cell) to an enucleated egg cellâ”that is, an egg cell with its nucleus, and thus its genetic material, removed. |
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http://encarta.msn.com/text_761567589___3/Cloning.html
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| | die-1 and dorsal intercalation |
| | Contact with the C blastomere orients the ABar spindle through a non-transcriptional Wnt spindle alignment pathway, while a Wnt/b-catenin pathway controls the timing of ABar spindle rotation. | | | In this study, we demonstrate the role of two Wnt signaling pathways involved in regulating the ABar mitotic spindle. | | | The three C. elegans Dishevelled homologs contribute to these processes in different ways, suggesting that functional distinctions may exist among them. |
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http://worms.zoology.wisc.edu/walston/ABar.html
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| | ANA Position Statement: Human Cloning by Means of Blastomere Splitting and Nuclear Transplantation |
| | It is crucial that nurses understand the science of cloning techniques and appreciate the implications of related developments in germ line gene therapy and stem cell research. | | | It is likely that there will be attempts to clone human beings in the near future and nurses must be able to speak to the ethical implications of such developments and point out possible advantages and disadvantages for the human species. | | | Ethics and Human Rights Position Statements: Human Cloning by Means of Blastomere Splitting and Nuclear Transplantation |
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http://www.needlestick.org/readroom/position/ethics/Etclone.htm
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| | CSIRO PUBLISHING - Reproduction, Fertility and Development |
| | The aim of the present study was to examine transient expression of transgene injected into nuclei of rat 2-cell stage embryos. | | | We also investigated the relationship between expression in both blastomeres and tail position of penetrated spermatozoa in rat 2-cell stage embryos. | | | On the other hand, in 63 parthenogenic rat 2-cell embryos in which there was no sperm tail, most embryos (86%, 54/63) had a single fluorescent blastomere at 24 h after microinjection. |
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http://www.publish.csiro.au/view/journals/dsp_journal_fulltext.cfm?nid=44&f=RDv17n2Ab109
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| | blast |
| | Scientists have learned to do the same thing artificially by using a technique called biastomere separation --a blastomere is a fertilized embryo at an early state of development. | | | While blastomere separation has not been used to clone humans, it has been employed extensively in the breeding of cattle and other livestock. | | | Humans are cloned naturally when the embryo splits on its own to produce twins or other multiple births. |
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http://www.personal.psu.edu/users/b/j/bjg148/blast.html
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| | Embryo Biopsy |
| | Embryo biopsy (also known as blastomere biopsy) is a technique that is performed by removal of one or two cells (blastomeres) from the 6 to 8 cell pre-embryo stage for the purpose of preimplantation analysis. | | | On the third day following fertilization, the embryo is at the cleavage stage, and a cell may be carefully removed for genetic analysis. |
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http://www.rgi2.com/blastomere.html
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| | Regulating blastomere identity |
| | Recent studies have shown that both spatial and temporal factors are important in the creation of blastomere identity. | | | A possible model for these interactions is shown in Figure 1. | | | A possible model for the spatial and temporal 1regulation of posterior blastomere specification in C. elegans. |
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http://zygote.swarthmore.edu/cyto5.html
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| | ENGLISH ENCYCLOPAEDIA - Blastomere |
| | In biology, a blastomere is the structure which results from the divisions of a fertilised egg during embryonic development. |
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http://encyclopaedic.net/english/bl/blastomere.html
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| | Preimplantation Genetic Diagnosis - PGD - a technique combining the recent advances in molecular genetics and assisted ... |
| | The biopsied blastomere is delivered to the genetic laboratory and the embryo returned into the incubator and appropriate tissue culture media to continue development. | | | Even in the best laboratory there might be some blastomeres which would be impossible to diagnose one way or the other, that is, confirm presence or absence of suspected abnormality. | | | The genetic laboratory is faced with the difficult task to evaluate a single cell for genetic disorder. |
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http://www.preimplantationgenetictesting.com/PGD_Process.htm
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| | Cytoplasmic Determinants (Frog) |
| | However, when experimental manipulation modifies the orientation of the first cleavage division so that the gray crescent is not bisected, the resulting blastomeres are not totipotent- only the one derived from the blastomere which inherits the gray crescent is normal. | | | , into equal halves; each blastomere is totipotent, able to develop into a complete | | | Hence, there are substances distributed within the egg which influence the subsequent developmental pattern of the embryo; these substances are called |
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http://tidepool.st.usm.edu/crswr/cytoplasmicdeterm.html
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| | Evo Devo Meeting Abstract U of Chicago 1999 |
| | We are especially interested in maternal genes involved in cell-cell interactions affecting cell fate, such as apx-1, which encodes the ligand for GLP-1 (a Notch homolog), and mediates signalling from the germline blastomere P2 to a somatic blastomere, ABp, in C. | | | Whereas the division patterns and blastomere positions in the early C. |
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http://www.macalester.edu/~montgomery/EvoDevoMtgAb'99.html
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