RESUMO
Mesenteric infection by the parasitic blood fluke Schistosoma bovis is a common veterinary problem in Africa and the Middle East and occasionally in the Mediterranean Region. The species also has the ability to form interspecific hybrids with the human parasite S. haematobium with natural hybridisation observed in West Africa, presenting possible zoonotic transmission. Additionally, this exchange of alleles between species may dramatically influence disease dynamics and parasite evolution. We have generated a 374 Mb assembly of the S. bovis genome using Illumina and PacBio-based technologies. Despite infecting different hosts and organs, the genome sequences of S. bovis and S. haematobium appeared strikingly similar with 97% sequence identity. The two species share 98% of protein-coding genes, with an average sequence identity of 97.3% at the amino acid level. Genome comparison identified large continuous parts of the genome (up to several 100 kb) showing almost 100% sequence identity between S. bovis and S. haematobium. It is unlikely that this is a result of genome conservation and provides further evidence of natural interspecific hybridization between S. bovis and S. haematobium. Our results suggest that foreign DNA obtained by interspecific hybridization was maintained in the population through multiple meiosis cycles and that hybrids were sexually reproductive, producing viable offspring. The S. bovis genome assembly forms a highly valuable resource for studying schistosome evolution and exploring genetic regions that are associated with species-specific phenotypic traits.
Assuntos
Hibridização Genética/genética , Schistosoma/genética , África , África Ocidental , Animais , Sequência de Bases/genética , Bovinos , Mapeamento Cromossômico/métodos , DNA/genética , Genoma/genética , Genoma Mitocondrial/genética , Hibridização Genética/fisiologia , Oriente Médio , Filogenia , Proteoma/genética , Especificidade da Espécie , Trematódeos/genética , Sequenciamento Completo do Genoma/métodosRESUMO
Corynebacterium falsenii is a member of the natural microflora of wild and domesticated birds and is rarely detected in human clinical specimens. The chromosomal sequence of the type strain C. falsenii DSM 44353 comprises 2,677,607 bp and provides detailed insights into the evolution of Corynebacterium species assigned to the highly diverse cluster 3.
RESUMO
Corynebacterium argentoratense is part of the human skin microbiota and is occasionally detected in the upper respiratory tract of patients suffering from tonsillitis. The complete DNA sequence of the type strain DSM 44202 comprises 2,031,902 bp, yielding the smallest genome sequenced thus far for a corynebacterium associated with humans.
