Karyotypic diversification of the Doradinae

For the discussion of catfish systematics. Post here to draw our attention to new publications or to discuss existing works.
Post Reply
User avatar
bekateen
Posts: 7431
Joined: Tue Sep 09, 2014 5:50 pm
I've donated: $40.00!
My articles: 4
My images: 78
My cats species list: 120 (i:40, k:52)
My aquaria list: 30 (i:13)
My BLogs: 36 (i:125, p:1867)
My Wishlist: 39
Spotted: 146
Location 1: USA, California, Stockton
Location 2: USA, California, Stockton
Contact:

Karyotypic diversification of the Doradinae

Post by bekateen »

Takagui, F.H., Viana, P., Baumgärtner, L., Bitencourt, J.A., Margarido, V.P., Lui, R.L., Feldberg, E., Birindelli, J.L.O., Almeida, F.S. & Giuliano-Caetano, L. (2021). Reconstruction of the Doradinae (Siluriformes-Doradidae) ancestral diploid number and NOR pattern reveals new insights about the karyotypic diversification of the Neotropical thorny catfishes. Genetics and Molecular Biology, 44.
Abstract
Doradinae (Siluriformes: Doradidae) is the most species-rich subfamily among thorny catfishes, encompassing over 77 valid species, found mainly in Amazon and Platina hydrographic basins. Here, we analyzed seven Doradinae species using combined methods (e.g., cytogenetic tools and Mesquite ancestral reconstruction software) in order to scrutinize the processes that mediated the karyotype diversification in this subfamily. Our ancestral reconstruction recovered that 2n=58 chromosomes and simple nucleolar organizer regions (NOR) are ancestral features only for Wertheimerinae and the most clades of Doradinae. Some exceptions were found in Trachydoras paraguayensis (2n=56), Trachydoras steindachneri (2n=60), Ossancora punctata (2n=66) and Platydoras hancockii whose karyotypes showed a multiple NOR system. The large thorny catfishes, such as Pterodoras granulosus, Oxydoras niger and Centrodoras brachiatus share several karyotype features, with subtle variations only regarding their heterochromatin distribution. On the other hand, a remarkable karyotypic variability has been reported in the fimbriate barbells thorny catfishes. These two contrasting karyoevolution trajectories emerged from a complex interaction between chromosome rearrangements (e.g., inversions and Robertsonian translocations) and mechanisms of heterochromatin dispersion. Moreover, we believe that biological features, such as microhabitats preferences, populational size, low vagility and migratory behavior played a key role during the origin and maintenance of chromosome diversity in Doradinae subfamily.
  • Keywords: Karyotypic diversification; Cytotaxonomy; 5S rDNA; 18S rDNA; Heterochromatin
Image
http://youtube.com/user/Bekateen1
Would you like to buy my fish? Click HERE for prices.
Buying caves from https://plecocaves.com? Plecocaves is now sponsoring Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
Post Reply