Abstract:
:I have used a novel single-sided specific polymerase chain reaction (PCR) strategy inspired by ligation-mediated PCR to clone fragments of divergent homeobox genes from a flatworm, the planarian Polycelis nigra. Eight homeobox-containing fragments were amplified, belonging to the Hox, msh, NK-1 and NK-2 classes. Together with the results obtained from several genomes of platyhelminths, my screening shows the presence of the same array of homeodomain developmental regulators in planarians, traditionally regarded as primitive metazoans in terms of body plan, as in coelomate organisms. However, the presence of a Ubx/abd-A homolog may indicate that platyhelminths are more closely related to protostomes than to deuterostomes and supports the idea that flatworms have inherited an elaborate HOX cluster (seven or eight genes) from their ancestor. Likely homologs of the fly genes tinman, bagpipe and S59 suggest that the mesoderm might be patterned by the same genes in all bilaterally symmetrical animals. Finally, a msh-like gene, a family known to be involved in inductive mechanisms in vertebrates, has been found. These results support the hypothesis that the tremendous diversity of metazoan body plans is specified by a largely conserved array of homeobox-containing developmental genes.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Balavoine Gdoi
10.1093/nar/24.8.1547subject
Has Abstractpub_date
1996-04-15 00:00:00pages
1547-53issue
8eissn
0305-1048issn
1362-4962pii
5b0250journal_volume
24pub_type
杂志文章abstract::MicroRNAs (miRNAs) are small noncoding RNAs that act as master regulators in many biological processes. miRNAs function mainly by downregulating the expression of their gene targets. Thus, accurate prediction of miRNA targets is critical for characterization of miRNA functions. To this end, we have developed an online...
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journal_title:Nucleic acids research
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更新日期:2003-09-15 00:00:00
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journal_title:Nucleic acids research
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更新日期:1990-11-25 00:00:00
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journal_title:Nucleic acids research
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journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2003-08-01 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:1986-09-25 00:00:00
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更新日期:2002-06-01 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/25.20.4004
更新日期:1997-10-15 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章,评审
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journal_title:Nucleic acids research
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journal_title:Nucleic acids research
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更新日期:1998-12-15 00:00:00
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journal_title:Nucleic acids research
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更新日期:2006-05-24 00:00:00
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journal_title:Nucleic acids research
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更新日期:2008-01-01 00:00:00
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journal_title:Nucleic acids research
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkv597
更新日期:2015-09-03 00:00:00
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