Complex evolution of the DAL5 transporter family

Area of Science:

• Fungal Genetics
• Evolutionary Biology
• Molecular Biology

Background:

• The DAL5 subfamily comprises eight known transmembrane transporter genes in S. cerevisiae, involved in vitamin transport.
• This ancient gene family is present in both Basidiomycetes and Ascomycetes, indicating its evolutionary significance.

Purpose of the Study:

• To investigate the complex evolutionary history of the DAL5 gene subfamily within fungi, particularly in Ascomycetes.
• To identify patterns of gene duplication, deletion, and potential horizontal gene transfer within this important gene family.

Main Methods:

• Phylogenetic analysis of gene families across fungal species.
• Identification of orthologous and paralogous gene relationships.
• Comparative genomics to trace gene expansion and contraction events.

Main Results:

• Numerous gene duplications and lineage-specific expansions or contractions of DAL5 members were identified.
• A close relationship between YIL166C homologs and genes in other yeast species suggests possible horizontal gene transfer.
• Several distinct gene groups lacking S. cerevisiae representation indicate novel subfamily members with potentially new functions.

Conclusions:

• The DAL5 transmembrane transporter gene family exhibits a complex evolutionary trajectory in yeast, marked by duplications, deletions, and horizontal gene transfer.
• These findings underscore the importance of the DAL5 subfamily for understanding fungal evolution, transmembrane protein evolution, and functional specialization.