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Blastulation

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401:. Prior to this transition, cleavage occurs with only the synthesis and mitosis phases of the cell cycle. The addition of the two growth phases into the cell cycle allows for the cells to increase in size, as up to this point the blastomeres undergo reductive divisions in which the overall size of the embryo does not increase, but more cells are created. This transition begins the growth in size of the organism. 108: 524:, maintenance of cell polarity and the creation of a permeability seal to regulate blastocoel formation. These tight junctions arise after the polarity of epithelial cells is established which sets the foundation for further development and specification. Within the blastula, inner blastomeres are generally non-polar while epithelial cells demonstrate polarity. 31: 582:
successfully produce preimplantation mouse embryos. In the mice, ninety percent of the females were induced by mechanical stimulation to undergo pregnancy and implant at least one embryo. These results prove to be encouraging because they provide a basis for potential implantation in other mammalian
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membrane polarity is established with the first cell cleavage. Amphibian EP-cadherin and XB/U cadherin perform a similar role as E-cadherin in mammals establishing blastomere polarity and solidifying cell-cell interactions which are crucial for further development.
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Blastula-stage cells can behave as pluripotent stem cells in many species. Pluripotent stem cells are the starting point to produce organ specific cells that can potentially aid in repair and prevention of injury and degeneration. Combining the expression of
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In many organisms the development of the embryo up to this point and for the early part of the blastula stage is controlled by maternal mRNA, so called because it was produced in the egg prior to fertilization and is therefore exclusively from the mother.
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usually occurs after a particular number of cell divisions for a given species, and is defined by the ending of the synchronous cell division cycles of the early blastula development, and the lengthening of the
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Tight junctions are very important in embryo development. In the blastula, these cadherin mediated cell interactions are essential to development of epithelium which are most important to
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are expressed. This process makes a ball of embryonic cells which are capable of interacting, rather than a group of diffuse and undifferentiated cells. E-cadherin adhesion defines the
494:. In the mouse embryo, blastocoel formation begins at the 32-cell stage. During this process, water enters the embryo, aided by an osmotic gradient which is the result of 1191:
Fleming, Tom P.; Papenbrock, Tom; Fesenko, Irina; Hausen, Peter; Sheth, Bhavwanti (1 August 2000). "Assembly of tight junctions during early vertebrate development".
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of new, non-maternal mRNA transcribed from the genome of the organism. Large amounts of the maternal mRNA are destroyed at this point, either by proteins such as
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embryos, the blastula is composed of three different regions. The animal cap forms the roof of the blastocoel and goes on primarily to form
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and locational positioning of the blastula cells can lead to the development of induced functional organs and tissues. Pluripotent
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is degraded and control over development is passed to the embryo. Many of the interactions between blastomeres are dependent on
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The blastula stage of early embryo development begins with the appearance of the blastocoel. The origin of the blastocoel in
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that produce a high sodium gradient on the basolateral side of the trophectoderm. This movement of water is facilitated by
207:. Only when the blastocoel is formed does the early embryo become a blastula. The blastula precedes the formation of the 1696: 1641: 1420: 471:
derivatives. The equatorial or marginal zone, which compose the walls of the blastocoel differentiate primarily into
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blastula cells can be directed to uniform muscle gene expression by gradient interpretation and a community effect"
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In the mammalian blastocyst there are three lineages that give rise to later tissue development. The
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in the developing embryo and turns the embryo from an indistinct ball of cells to a more polarized
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Etkin LD (1988) . "Regulation of the Mid-Blastula Transition in Amphibians". In Browder LW (ed.).
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During blastulation, a significant amount of activity occurs within the early embryo to establish
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tissue. The vegetal mass is composed of the blastocoel floor and primarily develops into
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Viczian, Andrea S.; Solessio, Eduardo C.; Lyou, Yung; Zuber, Michael E. (August 2009).
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Kalt, MR (August 1971). "The relationship between cleavage and blastocoel formation in
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gives rise to the fetus itself while the trophoblast develops into part of the
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The study of the blastula, and of cell specification has many implications in
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which sets the stage for further development into a fully formed blastocyst.
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cells, when used in an in vivo strategy, were able to form into functional
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The mid-blastula transition is also characterized by a marked increase in
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blastula is that it consists of a layer of blastomeres, known as the
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The Molecular Biology of Cell Determination and Cell Differentiation
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Sphere of cells formed during early embryonic development in animals
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Mammalian embryos undergo compaction around the 8-cell stage where
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The International Journal of Developmental Biology (Cambridge, UK)
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stem cells which can migrate down several pathways, depending on
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Developmental Biology 9th Ed + Devbio Labortatory Vade Mecum3
452:, sugars, ions and other components which are necessary for 144:. In mammalian development, the blastula develops into the 1228:"Collection and Transfer of Preimplantation Mouse Embryos" 908:
Gourdon, John B.; Standley, Henrietta J. (December 2002).
277:(MBT) is a crucial step in development during which the 1269:"Generation of Functional Eyes from Pluripotent Cells" 320:
can be formed. This potential can be instrumental in
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surrounding an inner fluid-filled cavity called the
1650: 1632: 1594: 1534: 1521: 1494: 1428: 1102:Tadros, W; Westwood, JT; Lipshitz, HD (June 2007). 242:which goes on to form the extra-embryonic tissues. 77: 65: 57: 52: 23: 863:Tadros, Wael; Lipshitz, Howard D. (1 March 2004). 115:and B. cross section of a blastula displaying the 974:Journal of Embryology and Experimental Morphology 697:. Sinauer Associates Inc. pp. 243–247, 161. 766:Cockburn, Katie; Rossant, Janet (1 April 2010). 604:. By transplanting them to the eye field on the 570:Experiments with implantation in mice show that 768:"Making the blastocyst: lessons from the mouse" 502:. A seal is created by tight junctions of the 1405: 8: 1321:Forgács, G. & Newman, Stuart A. (2005). 1193:Seminars in Cell & Developmental Biology 1327:Biological physics of the developing embryo 1531: 1412: 1398: 1390: 1186: 1184: 1182: 1180: 1145:"A tiny helper lightens the maternal load" 1143:Weigel, D; Izaurralde, E (24 March 2006). 1087:: CS1 maint: location missing publisher ( 761: 759: 757: 755: 29: 1346:"embryology and early animal development" 1294: 1284: 1243: 1160: 1119: 1020: 884: 815: 813: 811: 791: 686: 684: 682: 203:to develop into a ball of cells called a 1042: 1040: 642: 490:and the primitive endoderm becomes the 1350:Encyclopedia of life science, Volume 2 1080: 999:Tadros, W; Lipshitz, HD (March 2005). 972:. I. Light microscopic observations". 184:. Embryonic development begins with a 94: 20: 226:, which surrounds the blastocoel. In 7: 352:has been shown to be from the first 724:Comparative vertebrate reproduction 356:, which is widened and sealed with 14: 1323:"Cleavage and blastula formation" 772:Journal of Clinical Investigation 1367:McGeady, Thomas A., ed. (2006). 1104:"The mother-to-child transition" 302:assisted reproductive technology 1329:. Cambridge University Press. 324:for disease and injury cases. 289:in mammals and EP-cadherin in 1: 1226:Watson, J.G. (October 1977). 230:, the blastocyst contains an 1729:Animal developmental biology 1286:10.1371/journal.pbio.1000174 1121:10.1016/j.devcel.2007.05.009 820:Heasman, J (November 1997). 746:Forgács & Newman, 2005: 376:In many organisms including 164: 1697:Splanchnopleuric mesenchyme 1642:Splanchnopleuric mesenchyme 1421:Human embryonic development 1057:10.1007/978-1-4615-6817-9_7 261:. In many animals, such as 156:. The blastula (from Greek 1750: 1245:10.1095/biolreprod17.3.453 1162:10.1016/j.cell.2006.03.005 566:Fertilization technologies 513: 506:that line the blastocoel. 440:. The blastocoel contains 726:. Springer. p. 226. 718:Lombardi, Julian (1998). 622:Polarity in embryogenesis 583:species, such as humans. 285:expression, particularly 172:)) is a hollow sphere of 89: 28: 1702:Somatopleuric mesenchyme 1614:Somatopleuric mesenchyme 1423:in the first three weeks 454:cellular differentiation 308:, blastomeres behave as 1232:Biology of Reproduction 842:10.1242/dev.124.21.4179 691:Gilbert, Scott (2010). 673:Encyclopædia Britannica 580:artificial insemination 393:by the addition of the 275:mid blastula transition 199:, which undergoes many 1586:Regional specification 1205:10.1006/scdb.2000.0179 1009:Developmental Dynamics 873:Developmental Dynamics 522:paracellular transport 496:sodium–potassium pumps 386:midblastula transition 372:Midblastula transition 326:In vitro fertilisation 218:A common feature of a 148:with a differentiated 133:is the stage in early 127: 91:Anatomical terminology 1692:Intraembryonic coelom 1373:Veterinary embryology 1344:Cullen, K.E. (2009). 594:transcription factors 561:Clinical implications 330:transfer of an embryo 322:regenerative medicine 138:embryonic development 125:embryonic development 110: 947:. Macleod Laboratory 215:of the embryo form. 1375:. Wiley-Blackwell. 35:Blastulation: from 1108:Developmental Cell 1022:10.1002/dvdy.20297 886:10.1002/dvdy.20297 572:hormonal induction 298:stem cell research 257:, and to regulate 251:cell specification 140:that produces the 128: 1716: 1715: 1712: 1711: 1441:Oocyte activation 1382:978-1-4051-1147-8 1359:978-0-8160-7008-4 1336:978-0-521-78337-8 1066:978-1-4615-6819-3 733:978-0-7923-8336-9 704:978-0-87893-558-1 510:Cellular adhesion 105: 104: 100: 1741: 1604:Surface ectoderm 1567:Primitive groove 1548:Primitive streak 1532: 1414: 1407: 1400: 1391: 1386: 1363: 1340: 1309: 1308: 1298: 1288: 1264: 1258: 1257: 1247: 1223: 1217: 1216: 1188: 1175: 1174: 1164: 1140: 1134: 1133: 1123: 1099: 1093: 1092: 1086: 1078: 1044: 1035: 1034: 1024: 996: 990: 989: 963: 957: 956: 954: 952: 940: 934: 933: 905: 899: 898: 888: 860: 854: 853: 822:"Patterning the 817: 806: 805: 795: 784:10.1172/JCI41229 763: 750: 744: 738: 737: 715: 709: 708: 688: 677: 676: 665: 659: 658: 647: 544:apico-basal axis 504:epithelial cells 167: 123:of early animal 97:edit on Wikidata 33: 21: 1749: 1748: 1744: 1743: 1742: 1740: 1739: 1738: 1719: 1718: 1717: 1708: 1646: 1628: 1590: 1523: 1517: 1496: 1490: 1481:Inner cell mass 1424: 1418: 1383: 1366: 1360: 1343: 1337: 1320: 1317: 1312: 1279:(8): e1000174. 1266: 1265: 1261: 1225: 1224: 1220: 1190: 1189: 1178: 1142: 1141: 1137: 1101: 1100: 1096: 1079: 1067: 1046: 1045: 1038: 998: 997: 993: 965: 964: 960: 950: 948: 942: 941: 937: 907: 906: 902: 862: 861: 857: 836:(21): 4179–91. 819: 818: 809: 778:(4): 995–1003. 765: 764: 753: 745: 741: 734: 720:"Embryogenesis" 717: 716: 712: 705: 690: 689: 680: 667: 666: 662: 649: 648: 644: 640: 618: 589: 568: 563: 518: 512: 426: 374: 362:create a cavity 358:tight junctions 354:cleavage furrow 346: 259:gene expression 150:inner cell mass 101: 48: 17: 12: 11: 5: 1747: 1745: 1737: 1736: 1731: 1721: 1720: 1714: 1713: 1710: 1709: 1707: 1706: 1705: 1704: 1699: 1694: 1684: 1679: 1678: 1677: 1672: 1662: 1660:Axial mesoderm 1656: 1654: 1648: 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3: 2: 1746: 1735: 1732: 1730: 1727: 1726: 1724: 1703: 1700: 1698: 1695: 1693: 1690: 1689: 1688: 1687:Lateral plate 1685: 1683: 1680: 1676: 1673: 1671: 1668: 1667: 1666: 1663: 1661: 1658: 1657: 1655: 1653: 1649: 1643: 1640: 1639: 1637: 1635: 1631: 1625: 1622: 1620: 1617: 1615: 1612: 1610: 1609:Neuroectoderm 1607: 1605: 1602: 1601: 1599: 1597: 1593: 1587: 1584: 1580: 1577: 1576: 1575: 1572: 1568: 1565: 1563: 1559: 1556: 1554: 1553:Primitive pit 1551: 1550: 1549: 1545: 1542: 1541: 1539: 1537: 1533: 1530: 1527: 1520: 1514: 1511: 1509: 1506: 1505: 1503: 1500: 1493: 1487: 1484: 1482: 1479: 1477: 1474: 1472: 1469: 1467: 1464: 1462: 1459: 1457: 1454: 1452: 1449: 1447: 1444: 1442: 1439: 1437: 1436:Fertilization 1434: 1433: 1431: 1427: 1422: 1415: 1410: 1408: 1403: 1401: 1396: 1395: 1392: 1384: 1378: 1374: 1370: 1365: 1361: 1355: 1351: 1347: 1342: 1338: 1332: 1328: 1324: 1319: 1318: 1314: 1306: 1302: 1297: 1292: 1287: 1282: 1278: 1274: 1270: 1263: 1260: 1255: 1251: 1246: 1241: 1237: 1233: 1229: 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Infobase. 1349: 1326: 1315:Bibliography 1276: 1273:PLOS Biology 1272: 1262: 1238:(3): 453–8. 1235: 1231: 1221: 1196: 1192: 1152: 1148: 1138: 1114:(6): 847–9. 1111: 1107: 1097: 1048: 1012: 1008: 1002: 994: 980:(1): 37–49. 977: 973: 967: 961: 949:. Retrieved 938: 924:(8): 993–8. 921: 917: 911: 903: 876: 872: 866: 858: 833: 829: 823: 775: 771: 742: 723: 713: 693: 672: 663: 654: 645: 632:Triploblasty 609: 606:neural plate 597: 590: 569: 553: 552: 526: 519: 481: 464: 462: 458:gastrulation 428:A blastula ( 427: 413: 403: 381: 377: 375: 366: 349: 347: 338:implantation 305: 295: 268: 262: 244: 217: 195:to become a 169: 157: 141: 131:Blastulation 130: 129: 44: 36: 24:Blastulation 18: 1619:Neurulation 1544:Archenteron 1536:Germ layers 1486:Trophoblast 830:Development 627:Diploblasty 531:as well as 529:E-cadherins 442:amino acids 391:cell cycles 344:Development 310:pluripotent 240:trophoblast 232:embryoblast 213:germ layers 189:fertilizing 178:blastomeres 1723:Categories 1675:Somitomere 1562:Blastopore 1526:Trilaminar 1476:Blastocyst 1471:Blastocoel 1466:Cavitation 1456:Blastomere 1003:Drosophila 867:Drosophila 669:"Blastula" 638:References 587:Stem cells 500:aquaporins 477:endodermal 473:mesodermal 469:ectodermal 438:blastocoel 430:blastocyst 414:Drosophila 382:Drosophila 291:amphibians 287:E-cadherin 264:Drosophila 224:blastoderm 220:vertebrate 182:blastocoel 146:blastocyst 121:blastoderm 117:blastocoel 47:. blastula 1508:Hypoblast 1499:Bilaminar 1083:cite book 826:blastula" 548:phenotype 424:Structure 399:G2 phases 201:cleavages 176:known as 67:Precursor 1665:Paraxial 1652:Mesoderm 1634:Endoderm 1596:Ectoderm 1574:Gastrula 1513:Epiblast 1451:Cleavage 1305:19688031 1213:10966863 1171:16564001 1130:17543857 1031:15704150 951:22 March 930:12533022 895:15704150 802:20364097 616:See also 540:catenins 492:yolk sac 488:placenta 484:epiblast 479:tissue. 446:proteins 418:microRNA 283:cadherin 238:, and a 209:gastrula 193:egg cell 168:meaning 142:blastula 84:Gastrula 1734:Cloning 1522:Week 3 1495:Week 2 1296:2716519 1075:3077975 986:5565077 912:Xenopus 850:9334267 824:Xenopus 793:2846056 675:. 2013. 610:Xenopus 602:retinas 598:Xenopus 554:Xenopus 465:Xenopus 434:mammals 378:Xenopus 350:Xenopus 332:into a 318:tissues 306:Xenopus 270:Xenopus 228:mammals 165:blastos 159:βλαστός 53:Details 1670:Somite 1461:Morula 1446:Zygote 1429:Week 1 1379:  1356:  1333:  1303:  1293:  1254:901897 1252:  1211:  1169:  1128:  1073:  1063:  1029:  984:  928:  893:  848:  800:  790:  730:  701:  416:or by 384:, the 334:uterus 300:, and 273:, the 205:morula 197:zygote 170:sprout 135:animal 113:Morula 72:Morula 41:morula 748:p. 27 533:alpha 410:SMAUG 304:. In 236:fetus 186:sperm 174:cells 95:[ 1377:ISBN 1354:ISBN 1331:ISBN 1301:PMID 1250:PMID 1209:PMID 1167:PMID 1149:Cell 1126:PMID 1089:link 1071:PMID 1061:ISBN 1027:PMID 982:PMID 953:2013 926:PMID 891:PMID 846:PMID 798:PMID 728:ISBN 699:ISBN 578:and 537:beta 535:and 397:and 380:and 336:for 267:and 119:and 58:Days 1291:PMC 1281:doi 1240:doi 1201:doi 1157:doi 1153:124 1116:doi 1053:doi 1017:doi 1013:232 881:doi 877:232 838:doi 834:124 788:PMC 780:doi 776:120 463:In 432:in 412:in 360:to 191:an 111:A. 43:to 1725:: 1371:. 1348:. 1325:. 1299:. 1289:. 1275:. 1271:. 1248:. 1236:17 1234:. 1230:. 1207:. 1197:11 1195:. 1179:^ 1165:. 1151:. 1147:. 1124:. 1112:12 1110:. 1106:. 1085:}} 1081:{{ 1069:. 1059:. 1039:^ 1025:. 1011:. 1007:. 978:26 976:. 922:46 920:. 916:. 889:. 875:. 871:. 844:. 832:. 828:. 810:^ 796:. 786:. 774:. 770:. 754:^ 722:. 681:^ 671:. 653:. 612:. 574:, 460:. 448:, 444:, 395:G1 364:. 340:. 293:. 253:, 249:, 39:. 1560:/ 1546:/ 1528:) 1524:( 1501:) 1497:( 1413:e 1406:t 1399:v 1385:. 1362:. 1339:. 1307:. 1283:: 1277:7 1256:. 1242:: 1215:. 1203:: 1173:. 1159:: 1132:. 1118:: 1091:) 1077:. 1055:: 1033:. 1019:: 1005:" 988:. 955:. 932:. 897:. 883:: 869:" 852:. 840:: 804:. 782:: 736:. 707:. 657:. 162:( 99:] 61:4 45:2 37:1

Index


morula
Precursor
Morula
Gives rise to
Gastrula
Anatomical terminology
edit on Wikidata

Morula
blastocoel
blastoderm
embryonic development
animal
embryonic development
blastocyst
inner cell mass
trophectoderm
βλαστός
cells
blastomeres
blastocoel
sperm
fertilizing
egg cell
zygote
cleavages
morula
gastrula
germ layers

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