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  • Articles  (223)
  • Evolution  (223)
  • Springer  (223)
  • American Chemical Society (ACS)
  • Cell Press
  • 1995-1999  (207)
  • 1970-1974  (16)
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  • Articles  (223)
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  • 11
    Electronic Resource
    Electronic Resource
    Characterization of beta2-microglobulin in a primitive fish, the Siberian sturgeon (Acipenser baeri) (1999)
    Springer
    Immunogenetics 50 (1999), S. 79-83 
    Details
    ISSN: 1432-1211
    Keywords: Key words Beta2-microglobulin ; Evolution ; Sturgeon ; cDNA ; Genomic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510050690
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  • 12
    Electronic Resource
    Electronic Resource
    Crustal structure, evolution, and volcanic unrest of the Alban Hills, Central Italy (1997)
    Springer
    Bulletin of volcanology 59 (1997), S. 161-170 
    Details
    ISSN: 1432-0819
    Keywords: Key words Structure ; Evolution ; Uplift ; Geodetic modeling ; Alban Hills
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The Alban Hills, a Quaternary volcanic center lying west of the central Apennines, 15–25 km southeast of Rome, last erupted 19 ka and has produced approximately 290 km3 of eruptive deposits since the inception of volcanism at 580 ka. Earthquakes of moderate intensity have been generated there at least since the Roman age. Modern observations show that intermittent periods of swarm activity originate primarily beneath the youngest features, the phreatomagmatic craters on the west side of the volcano. Results from seismic tomography allow identification of a low-velocity region, perhaps still hot or partially molten, more than 6 km beneath the youngest craters and a high-velocity region, probably a solidified magma body, beneath the older central volcanic construct. Thirty centimeters of uplift measured by releveling supports the contention that high levels of seismicity during the 1980s and 1990s resulted from accumulation of magma beneath these craters. The volume of magma accumulation and the amount of maximum uplift was probably at least 40×106 m3 and 40 cm, respectively. Comparison of newer levelings with those completed in 1891 and 1927 suggests earlier episodes of uplift. The magma chamber beneath the western Alban Hills is probably responsible for much of the past 200 ka of eruptive activity, is still receiving intermittent batches of magma, and is, therefore, continuing to generate modest levels of volcanic unrest. Bending of overburden is the most likely cause of the persistent earthquakes, which generally have hypocenters above the 6-km-deep top of the magma reservoir. In this view, the most recent uplift and seismicity are probably characteristic and not precursors of more intense activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050183
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  • 13
    Electronic Resource
    Electronic Resource
    Molecular phylogeny based on the κ-casein and cytochrome b sequences in the mammalian suborder Ruminantia (1995)
    Springer
    Journal of molecular evolution 41 (1995), S. 859-866 
    Details
    ISSN: 1432-1432
    Keywords: Evolution ; κ-Casein ; Cytochrome b ; Artiodactyla ; Ruminantia ; Caprinae ; Capricornis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nucleotide sequences for the κ-casein precursor proteins have been determined from the genomic DNAs or hair roots of the Ruminantia. The coding regions, exons 2, 3, and 4, were amplified separately via the three kinds of PCRs and then directly sequenced. The primers were designed from the sequence of bovine κ-casein gene; they were applicable for the amplification of the κ-casein genes from the 13 species in the Ruminantia except exon 2 of the lesser mouse deer. These results permitted an easy phylogenetic analysis based on the sequences of an autosomal gene. A phylogenetic tree was constructed from the mature K-casein sequences and compared with the tree of the cytochrome b genes which were sequenced from the same individuals. The Cervidae (sika deer, Cervus nippon) were separated from the branch of the Bovidae on the tree of κ-casein genes with a relatively high confidence level of the bootstrap analysis, but included in the branch of the Bovidae on the tree of cytochrome b genes. The κ-casein tree indicated a monophyly of the subfamily Caprinae, although the internal branches were uncertain in the Caprinae. The tree based on the nucleotide sequences of cytochrome b genes clearly showed the relationships of the closely related species in the genus Capricornis consisting of serow (C. smatorensis), Japanese serow (C. crispus), and Formosan serow (C. swinhoei). These results would be explained by the difference of resolving power between the κ-casein and the cytochrome b sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173165
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  • 14
    Electronic Resource
    Electronic Resource
    The evolution of angiosperm seed proteins: A methionine-rich legumin subfamily present in lower angiosperm Clades (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 399-404 
    Details
    ISSN: 1432-1432
    Keywords: Asarum ; Dioscorea ; Angiosperms ; Evolution ; Legumins ; Seed proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Analysis of legumin-encoding cDNAs fromDioscorea caucasica Lipsky (Dioscoreaceae) and fromAsarum europaeum L. (Aristolochiaceae) shows that there is an especially methionine-rich legumin subfamily present in the lower angiosperm clades including the Monocotyledoneae. It is characterized by a methionine content of 3–4 mol% which is roughly triple the methionine proportion of most other legumins. These “MetR” legumins, if present, still have to be detected in the higher angiosperms including the important seed crops. Evolutionary analysis suggests that the MetR legumins are the result of a gene duplication allowing the differentiation of legumin genes according to their sulfur content. The duplication event must have taken place before the split into mono- and dicotyledonous plants but probably after the separation of angiosperms and gymnosperms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02339013
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  • 15
    Electronic Resource
    Electronic Resource
    Integration of retroposable elements in mammals: Selection of target sites (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 685-689 
    Details
    ISSN: 1432-1432
    Keywords: Retroposons ; Integration targets ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genomic DNA fragments generated by the reverse transcription of cellular RNA are called retroposons. Because they are flanked by short repeats, mammalian retroposons are believed to integrate at staggered chromosomal breaks. Recently, a significant sequence pattern associated with the integration of Alu and ID repeats was identified (Jurka 1996). It is represented by the 5′ TTAAAA consensus sequence around the 5′ ends of flanking repeats of Alu, ID, as well as, of B1 and B2 retroposed elements as shown in this paper. This consensus is a potential target for enzymatic nicking which probably occurs in the complementary strand between 3′ AA and the following 3′ TTTT bases. The first four bases of the flanking repeats corresponding to the 3′ TTTT consensus sequence show some sequence variations that may be affected by complementary base pairing between the A-rich RNA tails and the DNA target sequences prior to nicking and reverse transcription. We discuss potential evidence for such base pairing based on correlated variations in nucleotide composition of different tail and target regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02202117
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  • 16
    Electronic Resource
    Electronic Resource
    Caenorhabditis Globin genes: Rapid intronic divergence contrasts with conservation of silent exonic sites (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 101-108 
    Details
    ISSN: 1432-1432
    Keywords: Alleles ; Evolution ; Gene conversion ; Introns ; Nematode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Globin genes from theCaenorhabditis speciesbriggsae andremanei were identified and compared with a previously describedC. elegans globin gene. The encoded globins share between 86% and 93% amino acid identity, with most of the changes in or just before the putative B helix.C. remanei was found to have two globin alleles,Crg1-1 andCrgl-2. The coding sequence for each is interrupted by a single intron in the same position. The exons of the two genes are only 1 % divergent at the nucleotide level and encode identical polypeptides. In contrast, intron sequence divergence is 16% and numerous insertions and deletions have significantly altered the size and content of both introns. Genetic crosses show thatCrg1-1 andCrgl-2 segregate as alleles. Homozygous lines for each allele were constructed and northern analysis confirmed the expression of both alleles. These data reveal an unusual situation wherein two alleles encoding identical proteins have diverged much more rapidly in their introns than the silent sites of their coding sequences, suggesting multiple gene conversion events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02337354
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  • 17
    Electronic Resource
    Electronic Resource
    Evolution of the response patterns to dietary carbohydrates and the developmental differentiation of gene expression of α-amylase in Drosophila (1995)
    Springer
    Journal of molecular evolution 41 (1995), S. 1076-1084 
    Details
    ISSN: 1432-1432
    Keywords: Evolution ; Expression patterns ; α-Amylase ; Glucose repression ; Starch induction ; Intra- and interspecific variation ; Drosophila ; Gene expression ; Regulatory genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intraspecific variation of α-amylase activity in D. melanogaster and D. immigrans, which is distantly related to D. melanogaster, and interspecific variation of α-amylase activity in 18 Drosophila species were examined. The amount of intraspecific variation of α-amylase activities measured in terms of coefficient of variation in D. melanogaster and D. immigrans was one-half and one-tenth or less, respectively, of the interspecific variation in 18 Drosophila species. We also surveyed the response patterns of α-amylase activity to dietary carbohydrates at the larval and adult stages. The levels of α-amylase activity depended on both repression by dietary glucose (glucose repression) and induction by dietary starch (starch induction). In general, our data suggest that glucose repression was conserved among species at both stages while starch induction was mainly observed in larvae, although the degree of the response depended on species. In D. lebanonensis lebanonensis and D. serrata, larvae expressed electrophoretically different α-amylase variants (isozymes) from those of adult flies. These results may suggest that the regulatory systems responsible both for the response to environment and developmental expression are different among species in Drosophila.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173189
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  • 18
    Electronic Resource
    Electronic Resource
    Ferritin gene organization: Differences between plants and animals suggest possible kingdom-specific selective constraints (1996)
    Springer
    Journal of molecular evolution 42 (1996), S. 325-336 
    Details
    ISSN: 1432-1432
    Keywords: Soybean ; Ferritin ; Plant-animal ; Monocotyledons ; Dicotyledons ; Plastid ; Gene organization ; Evolution ; Intron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ferritin, a protein widespread in nature, concentrates iron −1011−1012-fold above the solubility within a spherical shell of 24 subunits; it derives in plants and animals from a common ancestor (based on sequence) but displays a cytoplasmic location in animals compared to the plastid in contemporary plants. Ferritin gene regulation in plants and animals is altered by development, hormones, and excess iron; iron signals target DNA in plants but mRNA in animals. Evolution has thus conserved the two end points of ferritin gene expression, the physiological signals and the protein structure, while allowing some divergence of the genetic mechanisms. Comparison of ferritin gene organization in plants and animals, made possible by the cloning of a dicot (soy-bean) ferritin gene presented here and the recent cloning of two monocot (maize) ferritin genes, shows evolutionary divergence in ferritin gene organization between plants and animals but conservation among plants or among animals; divergence in the genetic mechanism for iron regulation is reflected by the absence in all three plant genes of the IRE, a highly conserved, noncoding sequence in vertebrate animal ferritin mRNA. In plant ferritin genes, the number of introns (n = 7) is higher than in animals (n = 3). Second, no intron positions are conserved when ferritin genes of plants and animals are compared, although all ferritin gene introns are in the coding region; within kingdoms, the intron positions in ferritin genes are conserved. Finally, secondary protein structure has no apparent relationship to intron/exon boundaries in plant ferritin genes, whereas in animal ferritin genes the correspondence is high. The structural differences in introns/exons among phylogenetically related ferritin coding sequences and the high conservation of the gene structure within plant or animal kingdoms suggest that kingdom-specific functional constraints may exist to maintain a particular intron/exon pattern within ferritin genes. In the case of plants, where ferritin gene intron placement is unrelated to triplet codons or protein structure, and where ferritin is targeted to the plastid, the selection pressure on gene organization may relate to RNA function and plastid/nuclear signaling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02337543
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  • 19
    Electronic Resource
    Electronic Resource
    Sequence divergence in a family of variant surface glycoprotein genes from trypanosomes: Coding region hypervariability and downstream recombinogenic repeats (1996)
    Springer
    Journal of molecular evolution 42 (1996), S. 500-511 
    Details
    ISSN: 1432-1432
    Keywords: Evolution ; Multigene family ; Recombination ; Trypanosome ; Variant surface glycoprotein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The surface of the parasitic protozoanTrypanosoma brucei spp. is covered with a dense coat consisting of a single type of glycoprotein molecule, the variant surface glycoprotein (VSG). There may be as many as 1,000 genes for VSG within the genome ofT. brucei, and the switch of expression from one to another is the phenomenon of antigenic variation. As an approach to understanding the evolution of VSG genes we have determined the genomic DNA sequences of the eight genes encoding the variant surface glycoprotein 117 (VSG) family. From these data we have observed a number of features concerning the relationships between these genes: (1) there is a region of high variability confined to the N-terminus of the coding sequence, and comparison of the sequences with the available X-ray diffraction crystal structures suggests that two of the most variable stretches within the N-terminal domain are present on surface-exposed loops, indicating a role for epitope selection in evolution of these genes; (2) the 29 nucleotides surrounding the splice acceptor site are absolutely conserved in all eight 117 VSG genes; (3) numerous insertion/deletion mutations are located within or immediately downstream of the C-terminal protein-coding sequences: (4) within 500 by downstream of the insertion/deletion mutations are one or two copies of a repeat motif highly homologous to the recombinogenic 76-bp repeat sequences present upstream of many VSG basic copy genes and the expression-linked copy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02352280
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  • 20
    Electronic Resource
    Electronic Resource
    Evolution of disintegrin cysteine-rich and mammalian matrix-degrading metalloproteinases: Gene duplication and divergence of a common ancestor rather than convergent evolution (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 263-269 
    Details
    ISSN: 1432-1432
    Keywords: Metalloproteinase ; Disintegrin ; Evolution ; Venom ; Phylogeny ; Gene duplication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The evolution of the Metalloproteinase Disintegrin Cysteine-rich (MDC) gene family and that of the mammalian Matrix-degrading Metalloproteinases (MMPs) are compared. The alignment of snake venom and mammalian MDC and MMP precursor sequences generated a phylogenetic tree that grouped these proteins mainly according to their function. Based on this observation, a common ancestry is suggested for mammalian and snake venom MDCs; it is also possible that gene duplication of the already-assembled domain structure, followed by divergence of the copies, may have significantly contributed to the evolution of the functionally diverse MDC proteins. The data also suggest that the structural resemblance of the zinc-binding motif of venom MDCs and MMPs may best be explained by common ancestry and conservation of the proteolytic motifs during the divergence of the proteins rather than through convergent evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02338834
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