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1.
BMC Evol Biol ; 19(1): 209, 2019 11 13.
Artigo em Inglês | MEDLINE | ID: mdl-31722659

RESUMO

BACKGROUND: Various apolipoproteins widely distributed among vertebrata play key roles in lipid metabolism and have a direct correlation with human diseases as diagnostic markers. However, the evolutionary progress of apolipoproteins in species remains unclear. Nine human apolipoproteins and well-annotated genome data of 30 species were used to identify 210 apolipoprotein family members distributed among species from fish to humans. Our study focused on the evolution of nine exchangeable apolipoproteins (ApoA-I/II/IV/V, ApoC-I~IV and ApoE) from Chondrichthyes, Holostei, Teleostei, Amphibia, Sauria (including Aves), Prototheria, Marsupialia and Eutheria. RESULTS: In this study, we reported the overall distribution and the frequent gain and loss evolutionary events of apolipoprotein family members in vertebrata. Phylogenetic trees of orthologous apolipoproteins indicated evident divergence between species evolution and apolipoprotein phylogeny. Successive gain and loss events were found by evaluating the presence and absence of apolipoproteins in the context of species evolution. For example, only ApoA-I and ApoA-IV occurred in cartilaginous fish as ancient apolipoproteins. ApoA-II, ApoE, and ApoC-I/ApoC-II were found in Holostei, Coelacanthiformes, and Teleostei, respectively, but the latter three apolipoproteins were absent from Aves. ApoC-I was also absent from Cetartiodactyla. The apolipoprotein ApoC-III emerged in terrestrial animals, and ApoC-IV first arose in Eutheria. The results indicate that the order of the emergence of apolipoproteins is most likely ApoA-I/ApoA-IV, ApoE, ApoA-II, ApoC-I/ApoC-II, ApoA-V, ApoC-III, and ApoC-IV. CONCLUSIONS: This study reveals not only the phylogeny of apolipoprotein family members in species from Chondrichthyes to Eutheria but also the occurrence and origin of new apolipoproteins. The broad perspective of gain and loss events and the evolutionary scenario of apolipoproteins across vertebrata provide a significant reference for the research of apolipoprotein function and related diseases.


Assuntos
Apolipoproteínas/genética , Evolução Molecular , Vertebrados/genética , Animais , Códon , Deleção de Genes , Duplicação Gênica , Humanos , Filogenia , RNA Mensageiro/genética , Vertebrados/classificação
2.
Mol Biol Rep ; 39(3): 2653-8, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-21713409

RESUMO

MicroRNAs (miRNAs) are ~22-nt small non-coding RNAs that regulate the expression of specific target genes in many eukaryotes. miRNAs have been shown to play important roles in stem cell maintenance, cell fate determination, and differentiation. Planarians are capable of regenerating entire body plans from tiny fragments; this regenerative capacity is facilitated by a population of pluripotent stem cells known as neoblasts. Planarians have been a classic model system for the study of many aspects of stem cell biology. However, very limited knowledge on miRNA involved in this regulatory mechanism exists. This study profiles the expression of miRNAs in the normal and regenerative tissues of planarians using miRCURY LNA array technology. Thirteen miRNAs showed significant differences in expression between these two tissues. To further confirm our results, we examined the expression of two miRNAs by qRT-PCR. Results show that some known miRNAs may play key roles in the regulatory mechanisms of regeneration. Our findings can be utilized in future research on miRNA function.


Assuntos
MicroRNAs/genética , Planárias/genética , Células-Tronco Pluripotentes/metabolismo , Regeneração/genética , Animais , Biologia Computacional , Primers do DNA/genética , MicroRNAs/metabolismo , Análise em Microsséries , Planárias/metabolismo , Reação em Cadeia da Polimerase em Tempo Real
3.
Biochem Genet ; 50(1-2): 1-11, 2012 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-21874588

RESUMO

MicroRNAs (miRNAs) (noncoding RNAs of 20-25 nucleotides) play important roles in the post-transcriptional regulation of gene expression in various eukaryotes and prokaryotes. Piwi-interacting RNAs function by combining with PIWI proteins to regulate protein synthesis and to stabilize mRNA, the chromatin framework, and genome structure. This study investigates the role of miRNAs in regeneration. A scrDNA library was constructed, and 17 noncoding RNAs from Eisenia fetida (an optimal model for the study of earthworm regeneration) were cloned and characterized. In addition, reverse transcription polymerase chain reaction was performed to analyze the expression of four small RNAs during different developmental stages. The expression levels of these RNAs in regenerating tissue were higher than in normal tissue, and the expression patterns of these small RNAs were unique during development.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento , MicroRNAs/genética , Oligoquetos/genética , Animais , Clonagem Molecular , Oligoquetos/crescimento & desenvolvimento , Oligoquetos/fisiologia , RNA Interferente Pequeno/genética , RNA não Traduzido , Regeneração/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa
4.
Genomics ; 97(6): 364-71, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21333733

RESUMO

Planarians exhibit an extraordinary ability to regenerate lost body parts which is attributed to an abundance of pluripotent somatic stem cells called neoblasts. In this article, we report a transcriptome sequence of a Planaria subspecies Dugesia japonica derived by high-throughput sequencing. In addition, we researched transcriptome changes during different periods of regeneration by using a tag-based digital gene expression (DGE) system. Consequently, 11,913,548 transcriptome sequencing reads were obtained. Finally, these reads were eventually assembled into 37,218 unique unigenes. These assembled unigenes were annotated with various methods. Transcriptome changes during planarian regeneration were investigated by using a tag-based DGE system. We obtained a sequencing depth of more than 3.5million tags per sample and identified a large number of differentially expressed genes at various stages of regeneration. The results provide a fairly comprehensive molecular biology background to the research on planarian development, particularly with regard to its regeneration progress.


Assuntos
Perfilação da Expressão Gênica , Planárias/genética , Regeneração/genética , Animais , Mapeamento Cromossômico/métodos , Genes de Helmintos , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Fases de Leitura Aberta , Análise de Sequência de DNA/métodos
5.
Appl Biochem Biotechnol ; 164(7): 1037-47, 2011 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-21340538

RESUMO

Ancrod, a serine protease purified from the venom of Agkistrodon rhodostoma, is highly specific for fibrinogen. It causes anticoagulation by defibrinogenation and has been used as a therapeutic anticoagulant for the treatment of moderate to severe forms of peripheral arterial circulatory disorders in a variety of countries. The DNA of ancrod was amplified by recursive PCR with a yeast bias codon and cloned into the pGEM-T Easy vector. In order to achieve a high level secretion and a full activity expression of ancrod in Pichia pastoris (P. pastoris), the P. pastoris protein disulfide bond isomerase (PpPDI) was co-overexpressed in the strain. The secretion characteristics of ancrod with and without PpPDI were examined. With co-overexpression of PpPDI, the production of recombinant ancrod (rAncrod) was increased to 315 mg/L in the culture medium, which is twofold higher than the control strain carrying only the ancrod gene. Through purified by Ni²âº affinity chromatography and phenyl Sepharose column, the purity of rAncrod was found to be as high as 95.2%. The fibrinogenolytic and zymographic activities of the rAncrod were determined and found to be similar to that of the native protein. This improved expression system can facilitate further studies and the industrial production of ancrod.


Assuntos
Agkistrodon/metabolismo , Ancrod/metabolismo , Venenos de Crotalídeos/enzimologia , Proteínas Fúngicas/metabolismo , Pichia/enzimologia , Isomerases de Dissulfetos de Proteínas/metabolismo , Proteínas Recombinantes/metabolismo , Serina Endopeptidases/metabolismo , Ancrod/química , Ancrod/genética , Animais , Anticoagulantes/metabolismo , Western Blotting , Cromatografia de Afinidade , Venenos de Crotalídeos/química , Venenos de Crotalídeos/genética , Eletroforese em Gel de Poliacrilamida , Fibrinogênio/metabolismo , Proteínas Fúngicas/genética , Expressão Gênica , Vetores Genéticos , Pichia/genética , Reação em Cadeia da Polimerase , Isomerases de Dissulfetos de Proteínas/genética , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Serina Endopeptidases/química , Serina Endopeptidases/genética
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