Abstract:
:We analysed the genetic stability of two subtelomeric genes of the human malaria parasite Plasmodium falciparum. A PCR based assay, using a telomere and a target-gene specific primer was used to detect potential chromosome rearrangements. We show that chromosome breakage and the formation of new telomeres occur frequently in the two genes coding for histidine rich proteins (HRP I and HRP II) in laboratory isolates, but remains undetectable in clinical parasite isolates. This finding suggests an essential role of these genes in vivo and that chromosome breakage is rather an accidental process than a programmed chromosome fragmentation. Cloning and sequencing of 8 chromosome breakpoints of the HRP II gene from one parasite isolate shows that the breakage occurs within a broad region in which new telomere formation appear to take place at random sites. Furthermore, this analysis revealed no obvious sequence similarities of sites of telomere addition. Finally, we show that an irregular pattern of heterogeneous telomere repeats is added at each broken end and that each healed chromosome contains a distinct pattern of repeats. We discuss a model for telomere formation in P. falciparum.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Scherf A,Mattei Ddoi
10.1093/nar/20.7.1491keywords:
subject
Has Abstractpub_date
1992-04-11 00:00:00pages
1491-6issue
7eissn
0305-1048issn
1362-4962journal_volume
20pub_type
杂志文章abstract::Hepatitis B virus (HBV) infection remains a major health problem worldwide. The role played by microRNAs (miRNAs) in HBV replication and pathogenesis is being increasingly recognized. In this study, we found that miR-15b, an important miRNA during HBV infection and hepatocellular carcinoma development, directly binds ...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gku260
更新日期:2014-06-01 00:00:00
abstract::The third intron from Physarum polycephalum (Pp LSU 3) is one of the closest known relatives to the well-studied Tetrahymena group I intron. Both introns are located at the same position in the 26S rRNA gene, and with the exception of an open reading frame in Pp LSU 3, are highly homologous. While Pp LSU 3 has been sh...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/22.20.4315
更新日期:1994-10-11 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:2018-11-02 00:00:00
abstract::Cells of the central nervous system (CNS) are prone to the devastating consequences of trinucleotide repeat (TNR) expansion. Some CNS cells, including astrocytes, show substantial TNR instability in affected individuals. Since astrocyte enrichment occurs in brain regions sensitive to neurodegeneration and somatic TNR ...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2006-01-01 00:00:00
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doi:10.1093/nar/gkaa789
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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:1983-09-24 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:1982-12-11 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:2014-05-01 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:1986-02-11 00:00:00
abstract::Besides the nicking-closing (topoisomerase I) activity, an ATP-dependent DNA topoisomerase is present in rat liver nuclei. The enzyme, partially purified, is able to catenate in vitro closed DNA circles in a magnesium-dependent, ATP-dependent, histone H1-dependent reaction, and to decatenate in vitro kinetoplast DNA n...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/11.4.1059
更新日期:1983-02-25 00:00:00
abstract::The RNA-dependent RNA polymerases (RdRPs) encoded by RNA viruses represent a unique class of nucleic acid polymerases. RdRPs are essential in virus life cycle due to their central role in viral genome replication/transcription processes. However, their contribution in host adaption has not been well documented. By sol...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkaa1250
更新日期:2021-01-06 00:00:00
abstract::Nuclei from frozen calf thymus suspended in buffer were analyzed for metal content prior to and after repeated washing. After three such extractions about 0.1 micrograms Zn/mg DNA and 0.025 micrograms Cu/mg DNA remained tightly associated with chromatin. This level of metal was essentially unchanged with subsequent wa...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/9.21.5811
更新日期:1981-11-11 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkx546
更新日期:2017-07-27 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:2020-09-25 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkt1070
更新日期:2013-12-01 00:00:00
abstract::Oligonucleotides synthesized in array format suffer from contamination by truncated species. We have developed a method to invert DNA molecules in situ after completed synthesis. Reactive functions at the 5'-ends of the oligonucleotides are permitted to react with functions on the support before the 3'-ends are releas...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/27.24.4710
更新日期:1999-12-15 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:2013-01-01 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:1990-10-11 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:2011-07-01 00:00:00
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更新日期:1988-10-25 00:00:00
abstract::N-nitrosation of glycine and its derivatives generates potent alkylating agents that can lead to the formation of O(6)-carboxymethylguanine (O(6)-CMG) in DNA. O(6)-CMG has been identified in DNA derived from human colon tissue, and its occurrence has been linked to diets high in red and processed meats. By analogy to ...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2013-05-01 00:00:00
abstract::CCG repeats are highly over-represented in exons of the human genome. Usually they are located in the 5' UTR but are also abundant in translated sequences. The CCG repeats are associated with three tri-nucleotide repeat disorders: Huntington's disease, myotonic dystrophy type 1 and chromosome X-linked mental retardati...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2012-09-01 00:00:00
abstract::Mild ultraviolet irradiation of E. coli ribosomal subunits leads to the formation of a number of intra-RNA cross-links, in addition to the RNA-protein cross-links already reported (see refs. 9, 10). After partial ribonuclease digestion of the RNA from irradiated subunits, complexes containing these intra-RNA cross-lin...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/8.11.2397
更新日期:1980-06-11 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:1993-02-25 00:00:00
abstract::Detection of cancer-associated somatic mutations has broad applications for oncology and precision medicine. However, this becomes challenging when cancer-derived DNA is in low abundance, such as in impure tissue specimens or in circulating cell-free DNA. Next-generation sequencing (NGS) is particularly prone to techn...
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:1997-06-01 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkm956
更新日期:2008-01-01 00:00:00
abstract::DXZ4 is an X-linked macrosatellite composed of 12-100 tandemly arranged 3-kb repeat units. In females, it adopts opposite chromatin arrangements at the two alleles in response to X-chromosome inactivation. In males and on the active X chromosome, it is packaged into heterochromatin, but on the inactive X chromosome (X...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkr964
更新日期:2012-02-01 00:00:00