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  • Oxford University Press (OUP)  (2)
  • Ma, Li  (2)
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  • Oxford University Press (OUP)  (2)
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  • 1
    In: G3 Genes|Genomes|Genetics, Oxford University Press (OUP), Vol. 4, No. 8 ( 2014-08-01), p. 1503-1514
    Kurzfassung: The sperm or eggs of sexual organisms go through a series of cell divisions from the fertilized egg; mutations can occur at each division. Mutations in the lineage of cells leading to the sperm or eggs are of particular importance because many such mutations may be shared by somatic tissues and also may be inherited, thus having a lasting consequence. For decades, little has been known about the pattern of the mutation rates along the germline development. Recently it was shown from a small portion of data that resulted from a large-scale mutation screening experiment that the rates of recessive lethal or nearly lethal mutations differ dramatically during the germline development of Drosophila melanogaster males. In this paper the full data set from the experiment and its analysis are reported by taking advantage of a recent methodologic advance. By analyzing the mutation patterns with different levels of recessive lethality, earlier published conclusions based on partial data are found to remain valid. Furthermore, it is found that for most nearly lethal mutations, the mutation rate at the first cell division is even greater than previous thought compared with those at other divisions. There is also some evidence that the mutation rate at the second division decreases rapidly but is still appreciably greater than those for the rest of the cleavage stage. The mutation rate at spermatogenesis is greater than late cleavage and stem-cell stages, but there is no evidence that rates are different among the five cell divisions of the spermatogenesis. We also found that a modestly biased sampling, leading to slightly more primordial germ cells after the eighth division than those reported in the literature, provides the best fit to the data. These findings provide conceptual and numerical basis for exploring the consequences of differential mutation rates during individual development.
    Materialart: Online-Ressource
    ISSN: 2160-1836
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2014
    ZDB Id: 2629978-1
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    In: Plant Physiology, Oxford University Press (OUP), Vol. 135, No. 2 ( 2004-06-01), p. 773-782
    Kurzfassung: Here, we report our effort in generating an ORFeome collection for the Arabidopsis transcription factor (TF) genes. In total, ORFeome clones representing 1,282 Arabidopsis TF genes have been obtained in the Gateway high throughput cloning pENTR vector, including 411 genes whose annotation lack cDNA support. All the ORFeome inserts have also been mobilized into a yeast expression destination vector, with an estimated 85% rate of expressing the respective proteins. Sequence analysis of these clones revealed that 34 of them did not match with either the reported cDNAs or current predicted open-reading-frame sequences. Among those, novel alternative splicing of TF gene transcripts is responsible for the observed differences in at least five genes. However, those alternative splicing events do not appear to be differentially regulated among distinct Arabidopsis tissues examined. Lastly, expression of those TF genes in 17 distinct Arabidopsis organ types and the cultured cells was profiled using a 70-mer oligo microarray.
    Materialart: Online-Ressource
    ISSN: 1532-2548 , 0032-0889
    RVK:
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2004
    ZDB Id: 2004346-6
    ZDB Id: 208914-2
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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