Chromosomes and Karyotype of the Indian Pangolin, Manis crassicaudata Gray(Pholidota-Mammalia).

Aswathanarayana, N. V.

doi:10.1508/cytologia.65.379

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“…However, subsequent studies suggested that M. pentadactyla with 2n = 36 in India belongs to M. crassicaudata (Aswathanarayana 2000), while the 2n = 42 of M. pentadactyla from Taiwan likely represents a chromosomal count error due to the method used (Wu et al 2007). Comparison between individuals of 2n = 40 M. pentadactyla from Taiwan and the southwest of China revealed a slight difference in C-banding patterns and the number of NORs (Wu et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…As far as is known, not a single pangolin species in Africa has been karyotyped. The three species in Asia have been reported with different diploid numbers: the Indian pangolin (M. crassicaudata), 2n = 36 (Aswathanarayana 2000); the Malayan pangolin (M. javanica, MJA), 2n = 38 (Yang et al 2006), and the Chinese pangolin (M. pentadactyla, MPE) with four diploid numbers (2n = 36, 38, 40 and 42).…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of variations in the position of the nucleolar organizer region (NOR), the relative size of chromosomes and the centromere index, Chen et al (1991) suggested that a few tandem fusions could have resulted in reduction in diploid numbers of M. pentadactyla. However, subsequent studies even shed some doubt on the existence of the 2n = 36 and 2n = 42 M. pentadactyla (Aswathanarayana 2000;Wu et al 2007). The 2n = 38 M. pentadactyla and the karyotypic polymorphism of M. pentadactyla thus remain to be further verified.…”

Section: Introductionmentioning

confidence: 99%

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Chromosomal rearrangements underlying karyotype differences between Chinese pangolin (Manis pentadactyla) and Malayan pangolin (Manis javanica) revealed by chromosome painting

Nie

Wang

et al. 2009

Chromosome Res

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The Chinese pangolin (Manis pentadactyla), a representative species of the order Pholidota, has been enlisted in the mammalian whole-genome sequencing project mainly because of its phylogenetic importance. Previous studies showed that the diploid number of M. pentadactyla could vary from 2n = 36 to 42. To further characterize the genome organization of M. pentadactyla and to elucidate chromosomal mechanism underlying the karyotype diversity of Pholidota, we flow-sorted the chromosomes of 2n = 40 M. pentadactyla, and generated a set of chromosome-specific probes by DOP-PCR amplification of flow-sorted chromosomes. A comparative chromosome map between M. pentadactyla and the Malayan pangolin (Manis javanica, 2n = 38), as well as between human and M. pentadactyla, was established by chromosome painting for the first time. Our results demonstrate that seven Robertsonian rearrangements, together with considerable variations in the quantity of heterochromatin and in the number of nucleolar organizer regions (NORs) differentiate the karyotypes of 2n = 38 M. javanica and 2n = 40 M. pentadactyla. Moreover, we confirm that the M. javanica Y chromosome bears one NOR. Comparison of human homologous segment associations found in the genomes of M. javanica and M. pentadactyla revealed seven shared associations (HSA 1q/11, 2p/5, 2q/10q, 4p+q/20, 5/13, 6/19p and 8q/10p) that could constitute the potential Pholidota-specific signature rearrangements.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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