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Fig6 Evolutionary scenario for the vertebrate SSTR gene-bearing chromosome regions.pdf (932.68 kB)

Evolutionary scenario for the vertebrate SSTR gene-bearing chromosome regions

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Version 2 2013-06-17, 13:29
Version 1 2012-12-18, 13:46
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posted on 2013-06-17, 13:29 authored by Daniel Ocampo DazaDaniel Ocampo Daza, Görel Sundström, Christina A Bergqvist, Dan Larhammar

Published in: Ocampo Daza D, Sundström G, Bergqvist CA, Larhammar D. The evolution of vertebrate somatostatin receptors and their gene regions involves extensive chromosomal rearrangements. BMC Evolutionary Biology 2012, 12:231 doi:10.1186/1471-2148-12-231. Please refer to this article if using this figure.

Figure 6 Evolutionary scenario for the vertebrate SSTR gene-bearing chromosome
regions. 
Two ancient vertebrate chromosomes bearing one SSTR gene each duplicated in 2R,
generating two vertebrate paralogons; one bearing SSTR1, -4 and -6 genes (purple, pink, blue
and turquoise blocks) and one bearing SSTR2, -3 and -5 genes (red, yellow, orange and green
blocks). After the divergence of lobe-finned fishes (including tetrapods) and ray-finned fishes
(including teleosts), three of the 2R-generated blocks fused in the ray-finned fish lineage before 3R. Both paralogons duplicated in 3R, followed by rearrangements between
paralogous chromosome blocks, obscuring the ancestral conserved synteny. One of the fused,
duplicated and rearranged chromosome blocks split through a fission event. The paralogous
chromosome regions have been reconstructed for the chicken, human and medaka genomes
by mapping the identified paralogous gene families. The upper color blocks represent
ancestral chromosome regions in each lineage. Dashed boxes represent losses of chromosome
blocks. Chromosome rearrangements involving blocks of genes are represented by arrows,
while smaller translocations of genes are represented by dashed arrows. The full datasets are
presented in Tables S4 and S5 (see Additional files 3 and 4).

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