Abstract:
:The fertilized ascidian egg is thought to be comprised of distinct regions of tissue-specific cytoplasmic determinants. This idea was tested by bisecting fertilized eggs into egg fragments and culturing them until the unoperated controls developed into larvae. Fertilized eggs were bisected using a microsurgical method in which part of the uncleaved zygote was extruded through a hole made in the follicular envelope and the cytoplasmic bridge between the two egg regions was severed. One egg fragment contained all of the egg myoplasm (termed myoplasm-enriched or ME fragment), while the other fragment lacked myoplasm. ME fragments consisting of 40-50% of the total egg volume in many cases cleaved normally and developed into larvae. In a few cases, ME larvae initiated metamorphosis and developed into normal juveniles. Triton-extraction of ME embryos and larvae showed that the myoplasm was redistributed into nonmuscle lineage cells at each stage of development. Despite the redistribution of myoplasm into many of the endoderm cells situated in the head region of ME larvae, the expression of the muscle-specific enzyme acetylcholinesterase (AchE) and a muscle-specific antigen (Mu-2) was restricted to the tail muscle cells. The endoderm cells situated in the head region of ME larvae expressed an endoderm-specific enzyme alkaline phosphatase (AP) as in the controls. Furthermore, cleavage-arrested four- and eight-cell ME embryos expressed AchE activity in the expected number of blastomeres. When a greater quantity of myoplasm was redistributed into cells that normally do not express AchE activity by producing 10-30% ME embryos, in a few cases more than the expected number of blastomeres expressed AchE activity. In conclusion, the main finding of the present investigation, based on the development of ME fragments comprising 40-50% of the total egg volume, is that ascidian embryos are capable of regulative development.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Bates WRdoi
10.1016/0012-1606(88)90178-9subject
Has Abstractpub_date
1988-09-01 00:00:00pages
241-52issue
1eissn
0012-1606issn
1095-564Xpii
0012-1606(88)90178-9journal_volume
129pub_type
杂志文章abstract::Male germline stem cells (GSCs) in Drosophila melanogaster divide asymmetrically by orienting the mitotic spindle with respect to the niche, a microenvironment that specifies stem cell identity. The spindle orientation is prepared during interphase through stereotypical positioning of the centrosomes. We recently demo...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2011.10.010
更新日期:2012-01-01 00:00:00
abstract::Cell-cell fusion is a fundamental cellular process that is essential for development as well as fertilization. Myoblast fusion to form multinucleated skeletal muscle myotubes is a well studied, yet incompletely understood example of cell-cell fusion that is essential for formation of contractile skeletal muscle tissue...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2008.10.035
更新日期:2009-01-15 00:00:00
abstract::Thrombospondin type 1 repeat (TSR) superfamily members regulate diverse biological activities ranging from cell motility to inhibition of angiogenesis. In this study, we verified that mouse protein O-fucosyltransferase-2 (POFUT2) specifically adds O-fucose to TSRs. Using two Pofut2 gene-trap lines, we demonstrated tha...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2010.07.008
更新日期:2010-10-01 00:00:00
abstract::Mouse oocytes at metaphase I of meiotic maturation were treated with puromycin, which caused the condensed chromosomes to become decondensed to form an interphase nucleus. The chromosomes returned to a metaphase state 6.3 hr after the oocytes were transferred to puromycin-free medium [H. J. Clarke and Y. Masui (1983) ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(85)90006-5
更新日期:1985-03-01 00:00:00
abstract::The mammalian thalamus is an essential diencephalic derivative that plays unique roles in processing and relaying sensory and motor information to and from the cerebral cortex. The profile of transcription factors and lineage tracing experiments revealed a spatiotemporal relationship between diencephalic progenitor do...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2014.12.003
更新日期:2015-02-15 00:00:00
abstract::Expression of the c-abl proto-oncogene in the mouse testis is characterized by the production of a unique 4.7-kb transcript present in germ cells that have entered the haploid phase of spermatogenesis. A similar developmental stage specificity of expression is observed for a member of the 70-kDa heat-shock protein (hs...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(88)90222-9
更新日期:1988-02-01 00:00:00
abstract::Mechanisms coupling growth and metabolism are conserved in Drosophila and mammals. In metazoans, such coupling is achieved across tissue scales through the regulated secretion of chemical messengers such as insulin that control the metabolism and growth of cells. Although the regulated secretion of Insulin like peptid...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2017.12.008
更新日期:2018-02-01 00:00:00
abstract::The scalloped and vestigial genes are both required for the formation of the Drosophila wing, and recent studies have indicated that they can function as a heterodimeric complex to regulate the expression of downstream target genes. We have analyzed the consequences of complete loss of scalloped function, ectopic expr...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1006/dbio.2000.9939
更新日期:2000-12-15 00:00:00
abstract::The accumulation of total RNA transcripts of 18 late embryo-abundant (Lea) gene families, each encoding two closely related Lea mRNAs, was measured in cotyledon total RNA during embryogenesis and germination of Gossypium hirsutum L. by RNA dot hybridization. Transcript abundance of the three storage protein families w...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(87)90442-8
更新日期:1987-09-01 00:00:00
abstract::Hes3 belongs to the Hes basic helix-loop-helix family of transcriptional repressors that play central roles in maintaining progenitor cells and regulating binary cell fate decisions in the embryo. During Xenopus laevis development, hes3 is expressed in the embryonic ectoderm in a horseshoe shape domain at the edge of ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2018.07.011
更新日期:2018-10-01 00:00:00
abstract::During development of Dictyostelium discoideum, the cellular specific activity of beta-glucosidase increases before aggregation, declines to low levels during pseudoplasmodium formation, and increases rapidly during culmination. In addition, two electrophoretically distinct isozymes of beta-glucosidase are present at ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(87)90407-6
更新日期:1987-10-01 00:00:00
abstract::The development of the mammalian neocortex requires radial and tangential migration of cells. Radial migration of differentiated neurons from the ventricular zone (VZ) is well established. It is hypothesised that an earlier phase of tangential migration of mitotically active cells lays down a widespread periodically s...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2003.11.006
更新日期:2004-03-01 00:00:00
abstract::Much of boundary formation during development remains to be understood, despite being a defining feature of many animal taxa. Axial patterning of Hydra, a member of the ancient phylum Cnidaria which diverged prior to the bilaterian radiation, involves a steady-state of production and loss of tissue, and is dependent o...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2019.11.006
更新日期:2020-02-15 00:00:00
abstract::ragged seedling2 (rgd2) is a novel, recessive mutation affecting lateral organ development in maize. The mutant phenotype of homozygous rgd2-R leaves is variable. Mild leaf phenotypes have a reduced midrib and may be moderately narrow and furcated; severe Rgd2-R(-) leaves are filamentous or even radial. Despite their ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2005.03.027
更新日期:2005-06-15 00:00:00
abstract::Single cells from 512-cell Xenopus embryos, totally labeled with intracellular horseradish peroxidase, were transplanted orthotopically (from either dorsal or lateral marginal zone) or heterotopically (between these two marginal zones) to unlabeled host embryos at the 512-cell stage. At tailbud stage 23 the locations,...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/s0012-1606(89)80043-0
更新日期:1989-01-01 00:00:00
abstract::We have examined the presence of protein kinase C in oocytes of Chaetopterus pergamentaceus and its role in the initiation of germinal vesicle breakdown (GVBD). First, we demonstrated that the oocytes contain a phospholipid- and calcium-dependent protein kinase, protein kinase C (PKC). Since PKC is the primary intrace...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(92)90294-q
更新日期:1992-02-01 00:00:00
abstract::Epi 1, a monoclonal antibody, was generated against an epidermal specific epithelial antigen; it does not stain neural epithelium. We have used Epi 1 as a marker to determine when the spatial patterns delineating neural from nonneural epithelium become established. We used ventral ectoderm in a sandwich assay to show ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(89)90307-2
更新日期:1989-05-01 00:00:00
abstract::Embryonic organizers are signaling centers that coordinate developmental events within an embryo. Localized to either an individual cell or group of cells, embryonic organizing activity induces the specification of other cells in the embryo and can influence formation of body axes. In the spiralian Capitella teleta, p...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2018.01.004
更新日期:2018-03-01 00:00:00
abstract::Mesodermal tissue with heart forming potential (cardiogenic mesoderm) is induced during gastrulation. This cardiogenic mesoderm later differentiates into heart muscle tissue (myocardium) and non-muscular heart tissue. Inhibition of Wnt/beta-catenin signaling is known to be required early for induction of cardiogenic m...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2008.08.032
更新日期:2008-11-15 00:00:00
abstract::The myogenic basic helix-loop-helix transcription factor myogenin plays an essential role in the differentiation of skeletal muscle and, secondarily, in rib and sternum formation during mouse development. However, virtually nothing is known about the quantitative requirements for myogenin in these processes. Here, we ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1006/dbio.1998.9182
更新日期:1999-04-01 00:00:00
abstract::Alterations in cAMP concentrations have been implicated in developmentally regulated gene expression in Dictyostelium. Using a variety of culture conditions to control the metabolism of cAMP during cytodifferentiation, I have examined the role of the cyclic nucleotide in development. Conditions which allow intracellul...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(87)90342-3
更新日期:1987-07-01 00:00:00
abstract::During heart formation, the heart grows and undergoes dramatic morphogenesis to achieve efficient embryonic function. Both in fish and amniotes, much of the growth occurring after initial heart tube formation arises from second heart field (SHF)-derived progenitor cell addition to the arterial pole, allowing chamber f...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2020.11.008
更新日期:2021-02-01 00:00:00
abstract::A fundamental issue during nervous system development is how individual cells are formed from the undefined precursors. Differentiated neurons and glia, two major cell types mediating neuronal function, are acquired from immature precursors via a series of explicit controls exerted by transcription factors such as pro...
journal_title:Developmental biology
pub_type: 杂志文章,评审
doi:10.1016/j.ydbio.2012.07.018
更新日期:2012-10-01 00:00:00
abstract::The respective role of Pax2 and Pax8 in early kidney development in vertebrates is poorly understood. In this report, we have studied the roles of Pax8 and Pax2 in Xenopus pronephros development using a loss-of-function approach. Our results highlight a differential requirement of these two transcription factors for p...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2014.10.022
更新日期:2015-01-15 00:00:00
abstract::In the nematode Caenorhabditis elegans, the BMP-related growth factor DBL-1 regulates body size and male tail morphogenesis via a conserved receptor/Smad signaling pathway. Smads are transcription factors, but rely on transcription cofactors for appropriate regulation of target genes in response to TGF-beta- and BMP-r...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2007.02.038
更新日期:2007-05-15 00:00:00
abstract::Cardiomyocyte differentiation overall has been analyzed in vivo and in vitro at the molecular level by homologous recombination, gene mutation studies, and by transgenics; however, the roles of many signal transduction mechanisms that drive this differentiation process are still not fully understood. One set of signal...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/s0012-1606(02)00080-5
更新日期:2003-03-15 00:00:00
abstract::FOG-2 is a multi-zinc finger protein that binds the transcriptional activator GATA4 and modulates GATA4-mediated regulation of target genes during heart development. Our previous work has demonstrated that the Nucleosome Remodeling and Deacetylase (NuRD) complex physically interacts with FOG-2 and is necessary for FOG...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2014.08.030
更新日期:2014-11-01 00:00:00
abstract::Hox genes can function as key drivers of segment identity, with Hox mutations in Drosophila often resulting in dramatic homeotic transformations. In addition, however, they can serve other essential functions. In mammals, the study of Hox gene roles in development is complicated by the presence of four Hox clusters wi...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2018.03.020
更新日期:2018-06-15 00:00:00
abstract::The processes of myelination remain incompletely understood but are of profound biomedical importance owing to the several dysmyelinating and demyelinating disorders known in humans. Here, we analyze the zebrafish puma mutant, isolated originally for pigment pattern defects limited to the adult stage. We show that pum...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2010.07.035
更新日期:2010-10-15 00:00:00
abstract::Alkaline phosphatase (AP) activity is expressed in the endodermal cell lineage of ascidian embryos beginning at gastrulation. AP expression is resistant to levels of actinomycin D which completely suppress the appearance of other tissue-specific enzyme and morphological markers including acetylcholinesterase (AchE), a...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(87)90043-1
更新日期:1987-02-01 00:00:00