AI Article Synopsis

  • Species in the Echeneidae family are known for their ability to attach to hosts using a sucking disc; this study analyzed the mitochondrial genomes of three such species.
  • The mitochondrial genomes varied slightly in length and contained essential genes for protein coding, rRNA, tRNA, and a D-loop region, with most genes demonstrating specific patterns in their codon usage and genetic structure.
  • Phylogenetic analysis revealed distinct relationships among the species, with one species forming its own group and the others being closely related, thus adding valuable data to the understanding of this fish family's classification.

Article Abstract

Species of the family Echeneidae are renowned for their capacity to adhere to various hosts using a sucking disc. This study aimed to examine the mitochondrial genome characteristics of three fish species (, , and ) within the family Echeneidae and determine their phylogenetic relationships. The findings revealed that the mitochondrial genome lengths of the three species were 16,611 bp, 16,648 bp, and 16,623 bp, respectively, containing 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs), two ribosomal RNA genes (rRNAs), and a D-loop region. Most PCGs utilized ATG as the initiation codon, while only used the GTG as the initiation codon. Additionally, seven genes employed incomplete termination codons (T and TA). The majority of PCGs in the three species displayed negative AT-skew and GC-skew values, with the GC-skew amplitude being greater than the AT-skew. The Ka/Ks ratios of the 13 PCGs did not exceed 1, demonstrating these species had been subjected to purification selection. Furthermore, only (GCT) lacked the D arm, while other tRNAs exhibited a typical cloverleaf secondary structure. Bayesian inference (BI) and maximum likelihood (ML) methods were utilized to construct a phylogenetic tree of the three species based on the 13 PCGs. was identified as a distinct group, while and were classified as sister taxa. This study contributes to the mitochondrial genome database of the family Echeneidae and provides a solid foundation for further systematic classification research in this fish group.

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http://dx.doi.org/10.3390/ani15010081DOI Listing

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Article Synopsis
  • Species in the Echeneidae family are known for their ability to attach to hosts using a sucking disc; this study analyzed the mitochondrial genomes of three such species.
  • The mitochondrial genomes varied slightly in length and contained essential genes for protein coding, rRNA, tRNA, and a D-loop region, with most genes demonstrating specific patterns in their codon usage and genetic structure.
  • Phylogenetic analysis revealed distinct relationships among the species, with one species forming its own group and the others being closely related, thus adding valuable data to the understanding of this fish family's classification.
View Article and Find Full Text PDF

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