Ciona Intestinalis
Mostrando 1-12 de 41 artigos, teses e dissertações.
-
1. Ascídias (Tunicata, Ascidiacea) introduzidas no Arquipélago de Alcatrazes, São Paulo
O Arquipélago de Alcatrazes (24º06'S, 45º42'W) localiza-se a 36 km da costa e constitui uma Estação Ecológica desde 1987. Estando próximo à região portuária de São Sebastião, São Paulo, está sujeito à introdução de espécies exóticas. Com o objetivo de detectar se está ocorrendo ou não introdução de espécies, foram coletados 40 exempla
Iheringia. Série Zoologia. Publicado em: 2009-03
-
2. Ciona intestinalis Hox gene cluster: Its dispersed structure and residual colinear expression in development
Ascidians, belonging to the subphylum Urochordata, the earliest branch from the lineage to the vertebrates, exhibit a prototypical morphogenesis of chordates in the larval development, although they subsequently metamorphose into adults with a unique body structure. Recent draft genome analysis of the ascidian Ciona intestinalis has identified 9 Hox genes, w
National Academy of Sciences.
-
3. The non-LTR retrotransposons in Ciona intestinalis: new insights into the evolution of chordate genomes
In silico and experimental approaches have been used to identify the non-long terminal repeat retrotransposons of the urochordate Ciona intestinalis providing valuable data for understanding the evolution of early chordate genomes.
BioMed Central.
-
4. Germ-line transgenesis of the Tc1/mariner superfamily transposon Minos in Ciona intestinalis
The tadpole larva of the basal chordate Ciona intestinalis has the most simplified, basic body-plan of chordates. Because it has a compact genome with a complete draft sequence, a large quantity of EST/cDNA information, and a short generation time, Ciona is a suitable model for future genetics. We establish here a transgenic technique in Ciona that uses
National Academy of Sciences.
-
5. Seeing chordate evolution through the Ciona genome sequence
A draft sequence of the compact genome of the sea squirt Ciona intestinalis illuminates how chordates originated and how vertebrate developmental innovations evolved.
BioMed Central.
-
6. Mammalian and chicken I forms of gonadotropin-releasing hormone in the gonads of a protochordate, Ciona intestinalis
Two forms of gonadotropin-releasing hormone (GnRH) were isolated from the gonads of the tunicate, Ciona intestinalis. The primary structure of the purified peptides was determined by MS and chemical sequence analysis. Both GnRH forms have blocked NH2 and COOH termini, and their primary structures are identical to mammalian (mGnRH) and chicken I (cGnRH-I) for
The National Academy of Sciences.
-
7. A chemoattractant for ascidian spermatozoa is a sulfated steroid
Sperm chemotaxis toward eggs before fertilization has been demonstrated in many animals and plants, and several peptides and small organic compounds acting as chemoattractants have been identified. We previously showed that sperm of the ascidians Ciona intestinalis and Ciona savignyi are activated and then attracted toward the egg by a common factor released
National Academy of Sciences.
-
8. A saturation screen for cis-acting regulatory DNA in the Hox genes of Ciona intestinalis
A screen for the systematic identification of cis-regulatory elements within large (>100 kb) genomic domains containing Hox genes was performed by using the basal chordate Ciona intestinalis. Randomly generated DNA fragments from bacterial artificial chromosomes containing two clusters of Hox genes were inserted into a vector upstream of a minimal promoter a
National Academy of Sciences.
-
9. Evolutionary origins of the vertebrate heart: Specification of the cardiac lineage in Ciona intestinalis
Here we exploit the extensive cell lineage information and streamlined genome of the ascidian, Ciona intestinalis, to investigate heart development in a basal chordate. Several cardiac genes were analyzed, including the sole Ciona ortholog of the Drosophila tinman gene, and tissue-specific enhancers were isolated for some of the genes. Conserved sequence mot
National Academy of Sciences.
-
10. Gene number in an invertebrate chordate, Ciona intestinalis
Gene number can be considered a pragmatic measure of biological complexity, but reliable data is scarce. Estimates for vertebrates are 50-100,000 genes per haploid genome, whereas invertebrate estimates fall below 25,000. We wished to test the hypothesis that the origin of vertebrates coincided with extensive gene creation. A prediction is that gene number w
The National Academy of Sciences.
-
11. Noncoding regulatory sequences of Ciona exhibit strong correspondence between evolutionary constraint and functional importance
We show that sequence comparisons at different levels of resolution can efficiently guide functional analyses of regulatory regions in the ascidians Ciona savignyi and Ciona intestinalis. Sequence alignments of several tissue-specific genes guided discovery of minimal regulatory regions that are active in whole-embryo reporter assays. Using the Troponin I (T
Cold Spring Harbor Laboratory Press.
-
12. Ciona intestinalis nuclear receptor 1: A member of steroid/thyroid hormone receptor family
Nuclear hormone receptors comprise a large family of zinc finger transcription factors, some with hydrophobic ligands, such as thyroid hormone, vitamin D, steroids, etc., and others for which no ligand has been found. Thyroid hormone receptors (TRs) generally are considered to be confined to the vertebrata that possess a thyroid gland. Tunicates represent th
The National Academy of Sciences.