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Acaridae

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Yasumasa Kuwahara – 1st expert on this subject based on the ideXlab platform

  • biosynthesis of linoleic acid in tyrophagus mites acarina Acaridae
    Insect Biochemistry and Molecular Biology, 2013
    Co-Authors: Takako Aboshi, Yasumasa Kuwahara, Nobuhiro Shimizu, Yuji Nakajima, Yoshiyuki Honda, Hiroshi Amano, Naoki Mori

    Abstract:

    We report here that Tyrophagus similis and Tyrophagus putrescentiae (Astigmata: Acaridae) have the ability to biosynthesize linoleic acid [(9Z, 12Z)-9, 12-octadecadienoic acid] via a Δ12-desaturation step, although animals in general and vertebrates in particular appear to lack this ability. When the mites were fed on dried yeast enriched with d31-hexadecanoic acid (16:0), d27-octadecadienoic acid (18:2), produced from d31-hexadecanoic acid through elongation and desaturation reactions, was identified as a major fatty acid component of phosphatidylcholines (PCs) and phosphatidylethanolamines (PEs) in the mites. The double bond position of d27-octadecadienoic acid (18:2) of PCs and PEs was determined to be 9 and 12, respectively by dimethyldisulfide (DMDS) derivatization. Furthermore, the GC/MS retention time of methyl 9, 12-octadecadienoate obtained from mite extracts agreed well with those of authentic linoleic acid methyl ester. It is still unclear whether the mites themselves or symbiotic microorganisms are responsible for inserting a double bond into the Δ12 position of octadecanoic acid. However, we present here the unique metabolism of fatty acids in the mites.

  • chemical ecology of astigmatid mites lxxxvii s isopiperitenone re identification of the alarm pheromone as the female sex pheromone in tyrophagus similis acari Acaridae
    Journal of Chemical Ecology, 2012
    Co-Authors: Gorou Maruno, Yasumasa Kuwahara, Naoki Mori

    Abstract:

    Behavioral analysis revealed that S-(+)-isopiperitenone [(S)-3-methyl-6-isopropenyl-2-cyclohexen-1-one], previously identified as an alarm pheromone, is also the female sex pheromone of Tyrophagus similis (Astigmata: Acaridae), showing maximum male attraction at a dose of 0.1 female equivalent. Although the antipode, R-(−)-isopiperitenone, was not detectable in the mite extract, this synthetic optical isomer (80% e.e.) also induced activity at a dose of 100 ng, a response indicative of S-(+)-isopiperitenone being the active compound. The average content was determined to be 38.5 ng per female and 19.8 ng per male. This is the first example of an astigmatid mite species possessing a compound that functions as an alarm as well as a sex pheromone.

  • Chemical Ecology of Astigmatid Mites LXXXVII. S-(+)-Isopiperitenone: Re-identification of the Alarm Pheromone as the Female Sex Pheromone in Tyrophagus similis (Acari: Acaridae)
    Journal of Chemical Ecology, 2012
    Co-Authors: Gorou Maruno, Naoki Mori, Yasumasa Kuwahara

    Abstract:

    Behavioral analysis revealed that S-(+)-isopiperitenone [(S)-3-methyl-6-isopropenyl-2-cyclohexen-1-one], previously identified as an alarm pheromone, is also the female sex pheromone of Tyrophagus similis (Astigmata: Acaridae), showing maximum male attraction at a dose of 0.1 female equivalent. Although the antipode, R-(−)-isopiperitenone, was not detectable in the mite extract, this synthetic optical isomer (80% e.e.) also induced activity at a dose of 100 ng, a response indicative of S-(+)-isopiperitenone being the active compound. The average content was determined to be 38.5 ng per female and 19.8 ng per male. This is the first example of an astigmatid mite species possessing a compound that functions as an alarm as well as a sex pheromone.

Naoki Mori – 2nd expert on this subject based on the ideXlab platform

  • biosynthesis of linoleic acid in tyrophagus mites acarina Acaridae
    Insect Biochemistry and Molecular Biology, 2013
    Co-Authors: Takako Aboshi, Yasumasa Kuwahara, Nobuhiro Shimizu, Yuji Nakajima, Yoshiyuki Honda, Hiroshi Amano, Naoki Mori

    Abstract:

    We report here that Tyrophagus similis and Tyrophagus putrescentiae (Astigmata: Acaridae) have the ability to biosynthesize linoleic acid [(9Z, 12Z)-9, 12-octadecadienoic acid] via a Δ12-desaturation step, although animals in general and vertebrates in particular appear to lack this ability. When the mites were fed on dried yeast enriched with d31-hexadecanoic acid (16:0), d27-octadecadienoic acid (18:2), produced from d31-hexadecanoic acid through elongation and desaturation reactions, was identified as a major fatty acid component of phosphatidylcholines (PCs) and phosphatidylethanolamines (PEs) in the mites. The double bond position of d27-octadecadienoic acid (18:2) of PCs and PEs was determined to be 9 and 12, respectively by dimethyldisulfide (DMDS) derivatization. Furthermore, the GC/MS retention time of methyl 9, 12-octadecadienoate obtained from mite extracts agreed well with those of authentic linoleic acid methyl ester. It is still unclear whether the mites themselves or symbiotic microorganisms are responsible for inserting a double bond into the Δ12 position of octadecanoic acid. However, we present here the unique metabolism of fatty acids in the mites.

  • chemical ecology of astigmatid mites lxxxvii s isopiperitenone re identification of the alarm pheromone as the female sex pheromone in tyrophagus similis acari Acaridae
    Journal of Chemical Ecology, 2012
    Co-Authors: Gorou Maruno, Yasumasa Kuwahara, Naoki Mori

    Abstract:

    Behavioral analysis revealed that S-(+)-isopiperitenone [(S)-3-methyl-6-isopropenyl-2-cyclohexen-1-one], previously identified as an alarm pheromone, is also the female sex pheromone of Tyrophagus similis (Astigmata: Acaridae), showing maximum male attraction at a dose of 0.1 female equivalent. Although the antipode, R-(−)-isopiperitenone, was not detectable in the mite extract, this synthetic optical isomer (80% e.e.) also induced activity at a dose of 100 ng, a response indicative of S-(+)-isopiperitenone being the active compound. The average content was determined to be 38.5 ng per female and 19.8 ng per male. This is the first example of an astigmatid mite species possessing a compound that functions as an alarm as well as a sex pheromone.

  • Chemical Ecology of Astigmatid Mites LXXXVII. S-(+)-Isopiperitenone: Re-identification of the Alarm Pheromone as the Female Sex Pheromone in Tyrophagus similis (Acari: Acaridae)
    Journal of Chemical Ecology, 2012
    Co-Authors: Gorou Maruno, Naoki Mori, Yasumasa Kuwahara

    Abstract:

    Behavioral analysis revealed that S-(+)-isopiperitenone [(S)-3-methyl-6-isopropenyl-2-cyclohexen-1-one], previously identified as an alarm pheromone, is also the female sex pheromone of Tyrophagus similis (Astigmata: Acaridae), showing maximum male attraction at a dose of 0.1 female equivalent. Although the antipode, R-(−)-isopiperitenone, was not detectable in the mite extract, this synthetic optical isomer (80% e.e.) also induced activity at a dose of 100 ng, a response indicative of S-(+)-isopiperitenone being the active compound. The average content was determined to be 38.5 ng per female and 19.8 ng per male. This is the first example of an astigmatid mite species possessing a compound that functions as an alarm as well as a sex pheromone.

Chaopin Li – 3rd expert on this subject based on the ideXlab platform

  • The full-length mitochondrial rDNA sequence of Tyrophagus longior (Astigmata: Acaridae) and phylogeny of astigmatid mites based on mitochondrial rDNA sequences
    Journal of Stored Products Research, 2017
    Co-Authors: Banghe Yang, Chaopin Li

    Abstract:

    Abstract Mites of the genus Tyrophagus are economically important as they are polyphagous stored product pests and cause medically allergic reactions to human. Considering that examining the phylogenetic relationship among Astigmata species might help to understand their evolutionary process, we sequenced and analyzed the mitochondrial (mt) rDNA of the Tyrophagus longior and compared with those of six other astigmatid mites, as well as assessed the phylogenetic relationship among astigmatid species based on the complete mt rDNA sequences. Sequence analysis showed that the mt rDNA sequences of seven Astigmata species have high A + T contents (average value: 72.0% for 12S rRNA and 72.4% for 16S rRNA, respectively). The genetic distance and transition/transversion (TS/TV) of the seven Astigmata species reached interspecies level. In addition, the predicted stem-loop secondary structure of T. longior mt rDNA closely resembled those of other reported acariform mites. Finally, phylogenetic analyses based on complete sequences of 12S rRNA and 16S rRNA genes revealed that a close relationship between the families Acaridae and Pyroglyphidae, and supported the monophyly of the Acaridae as well as the Astigmata. These results are consistent with traditional classifications. Therefore, the mt rRNA genes are suitable for inferring phylogenetic relationship among astigmatid mites in this study, although the differentiation among the seven astigmata species has approached interspecies level.

  • characterization of the complete mitochondrial genome of the storage mite pest tyrophagus longior gervais acari Acaridae and comparative mitogenomic analysis of four acarid mites
    Gene, 2016
    Co-Authors: Banghe Yang, Chaopin Li

    Abstract:

    Abstract Mites of the genus Tyrophagus are economically important polyphagous pest commonly living on stored products and also responsible for allergic reactions to humans. Complete mitochondrial genomes (mitogenomes) and the gene features therein are widely used as molecular markers in the study of population genetics, phylogenetics as well as molecular evolution. However, scarcity on the sequence data has greatly impeded the studies in these areas pertaining to the Acari (mites and ticks). Information on the Tyrophagus mitogenomes is quite critical for phylogenetic evaluation and molecular evolution of the mitogenomes within Acariformes. Herein, we reported the complete mitogenome of the allergenic acarid storage mite Tyrophagus longior (Astigmata: Acaridae), an important member of stored food pests, and compared with those of other three acarid mites. The complete mitogenome of T. longior was a circular molecule of 13,271 bp. Unexpectedly, only 19 transfer RNA genes (tRNAs) were present, lacking trnF, trnS1 and trnQ. Furthermore, it also contained 13 protein-coding genes (PCGs) and 2 genes for rRNA (rrnS and rrnL) commonly detected in metazoans. The four mitogenomes displayed similar characteristics with respect to the gene content, nucleotide comparison, and codon usages. Yet, the gene order of T. longior was different from that in other Acari. The J-strands of the four mitogenomes possessed high A + T content (67.4–70.0%), and exhibited positive GC-skews and negative AT-skews. Most inferred tRNAs of T. longior were extremely truncated, lacking either a D- or T-arm, as found in other acarid mites. In T. longior mitogenome the A + T-rich region was just 50 bp in length and can be folded as a stable stem-loop structure, whereas in the region some structures of microsatellite-like (AT)n and palindromic sequences was not present. Besides, reconstructing of the phylogenetic relationship based on concatenated amino acid sequences of 13 PCGs supported that monophyly of the family Acaridae and the order Astigmata, to which the former belongs. Our results were consistent with the traditional classifications.

  • complete mitochondrial genome of caloglyphus berlesei Acaridae astigmata the first representative of the genus caloglyphus
    Journal of Stored Products Research, 2014
    Co-Authors: Chaopin Li, Shu Li, Shengli Gu

    Abstract:

    The complete circular mitochondrial genome (mitogenome) of Caloglyphus berlesei is 14,273 bp in length, and contains 13 protein-coding genes (PCGs), 2 rRNA genes and 22 tRNA genes. Twenty-six genes (9 PCGs, 2 rRNA genes and 15 tRNA genes) are encoded by the majority stand (J-strand), while the remaining are located on the minority strand (N-strand). Most inferred tRNA genes of C. berlesei are short (47–63 bp, average 53.6 ± 3.49 bp) and atypical lacking either the D- or T-arm. The largest non-coding region (341 bp) is present between trnF and trnS1, and contains a microsatellite-like (AT)n sequence and putative secondary structure features. This is the first description of a complete mitogenome of a species belonging to the Caloglyphus (Acaridae: Astigmata) genus.