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  • 1
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    Nucleotide variation along the Drosophila melanogaster fourth chromosome (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-01-05
    Description: The Drosophila melanogaster fourth chromosome, believed to be nonrecombining and invariable, is a classic example of the effect of natural selection in eliminating genetic variation in linked loci. However, in a chromosome-wide assay of nucleotide variation in natural populations, we have observed a high level of polymorphism in a approximately 200-kilobase region and marked levels of polymorphism in several other fragments interspersed with regions of little variation, suggesting different evolutionary histories in different chromosomal domains. Statistical tests of neutral evolution showed that a few haplotypes predominate in the 200-kilobase polymorphic region. Finally, contrary to the expectation of no recombination, we identified six recombination events within the chromosome. Thus, positive Darwinian selection and recombination have affected the evolution of this chromosome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Wen -- Thornton, Kevin -- Berry, Andrew -- Long, Manyuan -- New York, N.Y. -- Science. 2002 Jan 4;295(5552):134-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolution, Committee on Genetics, University of Chicago, 1101 East 57 Street, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11778050" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Pairing ; Chromosome Inversion ; Chromosomes/*genetics ; Drosophila Proteins/genetics ; Drosophila melanogaster/*genetics ; Evolution, Molecular ; *Genes, Insect ; *Genetic Variation ; Haplotypes ; Introns ; Linkage Disequilibrium ; Monte Carlo Method ; Mutation ; Nucleotides/genetics ; *Polymorphism, Genetic ; *Recombination, Genetic ; Selection, Genetic ; Sequence Analysis, DNA ; Trans-Activators/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Extensive gene traffic on the mammalian X chromosome (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-01-24
    Description: Mammalian sex chromosomes have undergone profound changes since evolving from ancestral autosomes. By examining retroposed genes in the human and mouse genomes, we demonstrate that, during evolution, the mammalian X chromosome has generated and recruited a disproportionately high number of functional retroposed genes, whereas the autosomes experienced lower gene turnover. Most autosomal copies originating from X-linked genes exhibited testis-biased expression. Such export is incompatible with mutational bias and is likely driven by natural selection to attain male germline function. However, the excess recruitment is consistent with a combination of both natural selection and mutational bias.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Emerson, J J -- Kaessmann, Henrik -- Betran, Esther -- Long, Manyuan -- GM-065429-01A1/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):537-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolution, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14739461" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Chromosomes, Human/genetics ; Chromosomes, Human, X/*genetics ; Chromosomes, Mammalian/genetics ; Computational Biology ; Dosage Compensation, Genetic ; Female ; Gene Expression Profiling ; Genes, Duplicate ; Genetic Linkage ; Genome ; Genome, Human ; Humans ; Introns ; Male ; Mice ; Monte Carlo Method ; Mutation ; Oligonucleotide Array Sequence Analysis ; Ovary/metabolism ; Pseudogenes/*genetics ; *Recombination, Genetic ; Retroelements/*genetics ; Selection, Genetic ; Sex Characteristics ; Testis/metabolism ; X Chromosome/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Plant development. Genetic control of distal stem cell fate within root and embryonic meristems (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-01-24
    Description: The root meristem consists of populations of distal and proximal stem cells and an organizing center known as the quiescent center. During embryogenesis, initiation of the root meristem occurs when an asymmetric cell division of the hypophysis forms the distal stem cells and quiescent center. We have identified NO TRANSMITTING TRACT (NTT) and two closely related paralogs as being required for the initiation of the root meristem. All three genes are expressed in the hypophysis, and their expression is dependent on the auxin-signaling pathway. Expression of these genes is necessary for distal stem cell fate within the root meristem, whereas misexpression is sufficient to transform other stem cell populations to a distal stem cell fate in both the embryo and mature roots.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crawford, Brian C W -- Sewell, Jared -- Golembeski, Greg -- Roshan, Carmel -- Long, Jeff A -- Yanofsky, Martin F -- 5 R01 GM072764/GM/NIGMS NIH HHS/ -- R01 GM072764/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2015 Feb 6;347(6222):655-9. doi: 10.1126/science.aaa0196. Epub 2015 Jan 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biological Sciences, University of California San Diego, La Jolla, CA 92093, USA. ; Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, CA 90095, USA. ; Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, CA 90095, USA. marty@ucsd.edu jeffalong@ucla.edu. ; Division of Biological Sciences, University of California San Diego, La Jolla, CA 92093, USA. marty@ucsd.edu jeffalong@ucla.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25612610" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/embryology/genetics ; Arabidopsis Proteins/genetics/*physiology ; *Gene Expression Regulation, Developmental ; *Gene Expression Regulation, Plant ; Indoleacetic Acids/pharmacology ; Meristem/cytology/*embryology ; Mutation ; Plant Development/*genetics ; Stem Cells/cytology/drug effects/*physiology ; Transcription Factors/genetics/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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