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  1. ...separate chromosomes. ALG γ was maintained alone on one chromosome (Chr 7), but genes from this ALG also dispersed to all other chromosomes (Fig. 4D). The C. mucedo exhibits a structure more derived from the ancestral state, characterized by numerous fission and fusion events with limited mixing, resulting...
  2. ...and chromosomal fusions. We have also identified an ancient chromosomal duplication that was maintained across these parasite's speciation, named collectively as the trypanosomatid ancestral supernumerary chromosome (TASC). TASC has most genes in the same coding strand, is expressed as a disomic chromosome (even...
  3. ...et al. 2016). Chr 2 is a fusion of Chr 7 with Chr 24 (Fraser et al. 2020) of Xiphophorus, which represents the basal poeciliid karyotype (Cimino 1974). This fusion was also observed in the assembly of Poecilia picta (Metzger et al. 2021).Assembly, genomic organization, and gene content of the Y...
  4. ...; Schneider et al. 2017) hosts annotations including genes (O'Leary et al. 2016; Frankish et al. 2021), regulatory regions (The ENCODE Project Consortium 2012; The ENCODE Project Consortium et al. 2020), and repeats (Benson 1999; Bailey et al. 2002; Smit 2013–2015), and it has become a universal coordinate...
  5. ...sequence, TBC1D3 copies, and USP6—a hominoid fusion gene of TBC1D3—are illustrated in maroon, red, and green, respectively. TBC1D3 demarcates the boundaries of large-scale rearrangements on chromosome phylogenetic group XVII. (B) TBC1D3 duplication block (cluster of colored arrows) demarcates the boundary...
  6. ...regions via chromosomal inversions approximated a linear process over time (Bhutkar et al. 2008). At a broader evolutionary scale, reconstructions of ancestral gene content in Proteobacteria and Archaea showed that gene losses and/or duplications correlated with amino acid substitution rates (Snel et al...
  7. ....e., 2qFus-Dist and 2qFus-Prox are the regions forming the distal and proximal sides of the 2q fusion site, respectively; both were at chromosome tips when the duplicative transfers occurred). Ancestral and derived states, when indicated, are inferred from breaks that disrupt genes, specific repetitive...
  8. ...genes (other than the ancestral male determiner), or it could have fused to an autosome (Carvalho and Clark 2005; Larracuente et al. 2010). Alternatively, the house fly Y Chromosome could have arisen through the fusion of the ancestral Y and X Chromosomes. However, after an X-Y fusion, the neo-Y should...
  9. ...-Aldrich Syndrome Protein and SCAR Homolog (WASH) gene family (Linardopoulou et al. 2007). This gene family has both expanded within the subtelomeric regions, with a copy located specifically at the site of the chromosome 2 fusion. The function of the specific family members is not known, but as a class...
  10. ...and after the divergence of salamanders and frogs. Fourth, we use the outgroup perspective provided by Ambystoma and X. tropicalis data to reconstruct the origin of chicken chromosomes by fission, fusion, and retention of ancestral chromosomes. Results Construction of an Ambystoma gene map Single nucleotide...
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