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: 8955
Joined: 09 Sep 2014, 17:50
I've donated: $40.00!
My articles: 4
My images: 130
My cats species list: 142 (i:102, k:39)
My aquaria list: 36 (i:13)
My BLogs: 44 (i:149, p:2653)
My Wishlist: 35
Spotted: 177
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. e20200068
https://doi.org/10.1590/1678-4685-GMB-2020-0068
https://www.scielo.br/j/gmb/a/QdcLGvd9tFd6TBPFxfwt6qJ/
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 (2n=56), (2n=60), (2n=66) and whose karyotypes showed a multiple NOR system. The large thorny catfishes, such as , and 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
Attachments
Figure 3 – Mirror trees showing maximum likelihood ancestral state reconstructions of diploid number and NORs pattern, based on Mk1 model using<br />the Mesquite software. This evolutionary analysis integrated cytogenetic data available for Doradidae species (including the present study) and two<br />Auchenipteridae species (sister group) with sequences of two mitochondrial DNA fragments (COI and 16S) and one nuclear DNA fragment (Rag 1)<br />obtainad from the molecular phylogeny of Arce et al. (2013).
Figure 3 – Mirror trees showing maximum likelihood ancestral state reconstructions of diploid number and NORs pattern, based on Mk1 model using
the Mesquite software. This evolutionary analysis integrated cytogenetic data available for Doradidae species (including the present study) and two
Auchenipteridae species (sister group) with sequences of two mitochondrial DNA fragments (COI and 16S) and one nuclear DNA fragment (Rag 1)
obtainad from the molecular phylogeny of Arce et al. (2013).
Image
Find me on YouTube and Facebook: http://youtube.com/user/Bekateen1; https://www.facebook.com/Bekateen
Buying caves from https://plecocaves.com? Plecocaves sponsor Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
Post Reply

Return to “Taxonomy & Science News”