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  • Articles  (2)
  • Key words: Mechanoreceptors  (1)
  • Natural killer cell receptors Immunoglobulin superfamily Evolution Chromosome 19q13.4 Leukocyte receptor cluster  (1)
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  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Extensive gene duplications and a large inversion characterize the human leukocyte receptor cluster (2000)
    Springer
    Immunogenetics 51 (2000), S. 703-713 
    Details
    ISSN: 1432-1211
    Keywords: Natural killer cell receptors Immunoglobulin superfamily Evolution Chromosome 19q13.4 Leukocyte receptor cluster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The chromosomal region 19q13.4 harbors the human leukocyte receptor cluster (LRC) which has been demonstrated to contain 19 genes encoding leukocyte-expressed receptors of the immunoglobulin (Ig) superfamily. A spotted PAC library was used to construct a contig of 65 overlapping clones spanning the complete LRC. Within the 900 kb covered by the contig, we identified one cluster containing killer cell inhibitory receptor genes and two clusters containing Ig-like transcript (ILT) genes. Of these, the second ILT cluster, located at the centromeric end of the LRC, was previously unknown. Detailed analysis of the ILT receptor genes in this cluster revealed one novel (ILT11) and six already known ILT genes. The two ILT clusters are transcribed in opposite directions and are separated by about 200 kb, which contains two leukocyte-associated inhibitory receptor (LAIR) genes. The data suggest that the two ILT clusters, each including one LAIR locus, arose from a single ancestral ILT/LAIR cluster by inverse duplication of a large genomic fragment. Furthermore, the NK cell-expressed NKp46 gene was localized 20 kb telomeric of FCAR; and 14 novel genes mapping within the LRC were identified by cDNA selection. Together with the gene for the ribosomal protein S9 (RPS9), which had previously been assigned to 19q13.4, the total number of LRC genes is now 44. Of these, 29 belong to the Ig superfamily.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510000187
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  • 2
    Electronic Resource
    Electronic Resource
    Are the most numerous sensilla of terrestrial isopods hygroreceptors? Ultrastructure of the dorsal tricorn sensilla of Porcellio scaber (1995)
    Springer
    Cell & tissue research 282 (1995), S. 135-145 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Mechanoreceptors ; Hygroreceptors ; Sensilla ; Woodlouse ; Porcellio scaber (Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The ultrastructure of the tricorn sensilla of the woodlouse Porcellio scaber was investigated in cryofixed and freeze-substituted, or chemically fixed specimens. The tricorn sensilla have a foramenized triangular-shaped outer hair and bear a poreless rod-like inner hair. The conical base of the inner hair is connected to the base of the outer hair by a complex cuticular structure. Each sensillum contains three sensory cells. The tip of one of the three dendrites contains a tubular body and is clamped between two bulges of the dendritic sheath. The two other dendrites protrude to the tip of the inner hair, flush against the cuticular wall. The microtubules in the ciliary segments are arranged in nine double tubuli that have neither osmiophilic cores nor arms. The ciliary rootlets are small. The inner segment of the largest dendrite wraps around the two smaller dendrites and one of seven enveloping cells in a mesaxon-like manner. Although this ultrastructure deviates considerably from most crustacean mechanosensitive sensilla, it nevertheless suggests a mechanosensitive function, at least for one of the sensory cells. In many aspects, the tricorn sensilla resemble the thermo-hygrosensilla of insects. However, our results suggest that the structural criteria for thermo-hygro-sensitivity used in insects cannot simply be applied to crustaceans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319140
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