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DNA Sequence Alignment and Phylogenetic Inferences: Guidelines for Analysis and the Selection of Appropriate Methods for Molecular Systematics

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Molecular Systematics of Parasitic Helminths

Abstract

Changes that occur in the genome (or DNA) are pieces of genetic information containing valuable information to reveal the evolutionary history of organisms. As mentioned in the previous chapter, the elucidation of DNA sequences is a major advancement in the field of molecular biology. These advancements allowed sequences to be compared between different organisms, looking at similarities and differences. Through looking at molecular level changes, the reconstruction of phylogenies based on these sequences can be performed. Molecular phylogenies provide insights into the evolutionary relationships among organisms and a closer look at the processes behind species diversity. In addition, molecular phylogenies are also beneficial in the taxonomical classification and identification of organisms. Regarding Chap. 7, we reviewed the principles behind molecular-based techniques like PCR and DNA sequencing, together with examples of each method popular among researchers. In this chapter, we looked at the types of mutations that can occur in the DNA and the terminologies and main concepts of DNA sequence alignment. The principles behind phylogenetic inferences were introduced and the explanation of various models and methods. Finally, guidelines for analysis and practical steps for sequence alignment and the reconstruction of phylogenetic trees were discussed to complete the link between physical specimens, DNA sequences, and phylogenetic trees.

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Thaenkham, U., Chaisiri, K., Hui En Chan, A. (2022). DNA Sequence Alignment and Phylogenetic Inferences: Guidelines for Analysis and the Selection of Appropriate Methods for Molecular Systematics. In: Molecular Systematics of Parasitic Helminths . Springer, Singapore. https://doi.org/10.1007/978-981-19-1786-8_8

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