A preliminary study on origin of Callosciurus squirrels introduced into Japan

Oshida, Tatsuo; Torii, Harumi; Lin, Liang‐Kong; Lee, Jen-Kai; Chen, Yean-Jen; Endo, Hideki; Sasaki, Motoki

doi:10.3106/1348-6160(2007)32[75:apsooo]2.0.co;2

Cited by 22 publications

(26 citation statements)

References 16 publications

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“…The ML, BI and MP phylogenetic trees obtained had similar topologies and we therefore only show the BI tree with the support values of the three analyses (Figure 2). The haplotype found in Argentina has not been previously sampled in other populations and was phylogenetically closer to sequences of C. finlaysonii, particularly to the two haplotypes sampled in Japan that had been morphologically identified as C. erythraeus (Oshida et al 2007).…”

Section: Resultsmentioning

confidence: 88%

“…Genetic introgression between subspecies, and even between species, has been reported in other squirrels given the hybridization that frequently occurs in pet markets and stores (Wettstein et al 1995;Good et al 2008;Hird & Sullivan 2009;Chang et al 2011). Oshida et al (2007) and Kuramoto et al (2012) concluded that the squirrels introduced into Japan that had been identified as C. erythraeus but were genetically closer to C. finlaysonii could be regarded either as C. finlaysonii or as hybrids between both species. However, no studies have yet evaluated whether the present classification of Callosciurus has any genetic support.…”

Section: Discussionmentioning

confidence: 99%

“…Wild populations of C. finlaysonii have only been reported in Italy (Bertolino et al 1999), while C. erythraeus has been recorded in Argentina, Belgium, France, Japan and the Netherlands (Lurz et al 2013). However, a recent study conducted in Japan described some individuals that were morphologically identified as C. erythraeus but genetically closer to C. finlaysonii (Oshida et al 2007). The authors assumed that both species have been introduced into Japan (Oshida et al 2007), where a new haplotype of C. finlaysonii was described in a subsequent study (Kuramoto et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…However, a recent study conducted in Japan described some individuals that were morphologically identified as C. erythraeus but genetically closer to C. finlaysonii (Oshida et al 2007). The authors assumed that both species have been introduced into Japan (Oshida et al 2007), where a new haplotype of C. finlaysonii was described in a subsequent study (Kuramoto et al 2012). Recently, Oshida et al (2013) found that C. erythraeus griseimanus was more closely related to C. finlaysonii than to C. erythraeus cf.…”

Section: Introductionmentioning

confidence: 99%

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Genetic characterization ofCallosciurus(Rodentia: Sciuridae) Asiatic squirrels introduced in Argentina

Gabrielli

Cardoso

Benitez

et al. 2014

Italian Journal of Zoology

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Squirrels have been traded in the pet market for several decades, and numerous species have established in the wild. The Asiatic species Callosciurus erythraeus and Callosciurus finlaysonii have been introduced into other parts of Asia, in Europe and South America. In this study, (1) we conducted a genetic characterization of C. erythraeus introduced into Argentina and compared them with native and introduced populations in Asia, and (2) we analyzed genetic variation among the four invasion foci in Argentina in order to corroborate that the pathway of invasion was a single introduction event in the country and subsequent translocations. We analyzed mitochondrial (cytochrome b, Cyt b; cytochrome oxidase c subunit I, COI and D-loop) and nuclear (recombination activating gene I, RAGI) DNA markers using the classical method (DNA barcoding gap analysis) and also the Automatic Barcode Gap Discovery method (ABGD). The markers D-loop, COI, and RAG1 indicated that the introduced squirrels from the different invasion foci formed a monophyletic group that, together with only one haplotype for the D-loop and COI markers, supported the hypothesis of one introduction event into Argentina followed by subsequent translocations. Unexpectedly, sequences from squirrels captured in Argentina were more related to C. finlaysonii than to C. erythraeus for D-loop and Cyt b markers. However, intraspecific variation among sequences of C. erythraeus belonging to different subspecies or collected in different regions was large and comparable with the distance to the sequences from Argentina. The ABGD method also indicated large genetic variability within C. erythraeus and close proximity between squirrels from Argentina and C. finlaysonii. The complex taxonomy of Callosciurus, as occurs with the sister species C. erythraeus and C. finlaysonii, requires a thorough systematic revision. A simultaneous analysis of diagnostic morphological characters and genetic markers is needed and will provide new insight regarding the worldwide invasion of Asiatic squirrels.

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Section: Resultsmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic characterization ofCallosciurus(Rodentia: Sciuridae) Asiatic squirrels introduced in Argentina

Gabrielli

Cardoso

Benitez

et al. 2014

Italian Journal of Zoology

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“…Solid boxes indicate C. erythraeus haplotypes reported by Oshida et al (2007) or found in the present study. The dashed box indicates C. finlaysonii haplotypes reported by Oshida et al (2007). sequences of this new population and compared them to haplotype sequences reported previously from Japan and Taiwan (Oshida et al 2006(Oshida et al , 2007. If the haplotype sequences of the Kumamoto population were the same as or similar to those from Japan and Taiwan, the origin of this population was most likely to be Taiwan.…”

mentioning

confidence: 91%

Origin ofCallosciurus erythraeusIntroduced into the Uto Peninsula, Kumamoto, Japan, Inferred from Mitochondrial DNA Analysis

Ikeda

Yasuda

Sakanashi³

et al. 2011

Mammal Study

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Fibrinogen Aα‐chain amyloidosis outbreaks in Japanese squirrels (Sciurus lis): a potential disease model

Iwaide

Ito

Ogino

et al. 2023

The Journal of Pathology

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Fibrinogen Aα‐chain amyloidosis is a hereditary systemic amyloidosis characterized by glomerular amyloid depositions, which are derived from the fibrinogen Aα‐chain variant in humans. Despite its unique pathology, the pathogenic mechanisms of this disease are only partially understood. This is in part because comparative pathological studies on fibrinogen Aα‐chain amyloidosis are currently unavailable as there is a lack of reported cases in animals other than humans. In this study, mass spectrometry‐based proteomic analyses of Japanese squirrels (Sciurus lis) that died in five Japanese zoos showed that they developed glomerular‐associated fibrinogen Aα‐chain amyloidosis with an extremely high incidence rate (29/38 cases, 76.3%). The condition was found to be age‐dependent in the Japanese squirrels, with 89% of individuals over 4 years of age affected. Mass spectrometry revealed that the C‐terminal region of the fibrinogen Aα‐chain was involved in amyloidogenesis in Japanese squirrels as well as humans. No gene variations were identified between amyloid‐positive and amyloid‐negative squirrels, which contrasted with the available data for humans. The results indicate that fibrinogen Aα‐chain amyloidosis is a senile amyloidosis in Japanese squirrels. The results have also provided comparative pathological support that the amyloidogenic C‐terminal region of the fibrinogen Aα‐chain is involved in the characteristic glomerular pathology, regardless of the animal species. This study elucidates the potential causes of death in Japanese squirrels and will contribute to future comparative pathological studies of fibrinogen Aα‐chain amyloidosis. © 2023 The Pathological Society of Great Britain and Ireland.

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A preliminary study on origin of Callosciurus squirrels introduced into Japan

Cited by 22 publications

References 16 publications

Genetic characterization ofCallosciurus(Rodentia: Sciuridae) Asiatic squirrels introduced in Argentina

Genetic characterization ofCallosciurus(Rodentia: Sciuridae) Asiatic squirrels introduced in Argentina

Origin ofCallosciurus erythraeusIntroduced into the Uto Peninsula, Kumamoto, Japan, Inferred from Mitochondrial DNA Analysis

Fibrinogen Aα‐chain amyloidosis outbreaks in Japanese squirrels (Sciurus lis): a potential disease model

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