FISH analysis comparing genome organization in the domestic horse (Equus caballus) to that of the Mongolian wild horse (E. przewalskii).

This research article explores the comparison of the genome organization between the domestic horse and the Mongolian wild horse using Fluorescence in situ Hybridization (FISH) analysis. The study was conducted to confirm the homology between the chromosomes of both horse species and identified specific chromosomes that are homologous.

Objective of the research

• The research aims to compare the genome organization between the domestic horse (Equus caballus) and the Mongolian wild horse (E. przewalskii) using Fluorescence in situ Hybridization (FISH) analysis.
• It discusses the phylogenetic relationship and taxonomic classification of the two species based on their chromosome morphology, banding patterns, and genome mapping.
• The study is conducted to confirm the previously predicted homology between the chromosomes of both horse species and to determine the specific chromosomes that are homologous.

Methodology of the research

• The research employed FISH mapping, a technique used in cytogenetics that uses fluorescent probes to bind parts of the chromosome having its DNA sequence.
• The study used 46 domestic horse-derived BAC clones containing genes previously mapped to domestic horse chromosomes.
• The homologies between the chromosomes were confirmed based on GTG banding, a technique for staining the chromosomes to reveal its characteristic pattern.

Findings of the research

• The analysis indicated that all chromosomes of both horse species were homologous as predicted by GTG banding. This means that the chromosome pairings in the two species are evolutionarily related and share a common ancestor.
• The analytical findings provide new information that the acrocentric chromosomes, EPR23 and EPR24, in the Mongolian wild horse are shown to be homologues of the metacentric chromosome, ECA5, in the domestic horse.

Implications of the research

• The confirmation and identification of the homology between the chromosomes of both horse species can contribute significant knowledge in the fields of genetics and evolutionary biology.
• This can help in understanding the genetic variation across species and can be useful in studying the evolution, genetic diseases, and breeding of horses.
• Further studies can be conducted based on the findings of this research for a better understanding of the genetic relationship between different species.