LUX Score

LUX Score quantifies pairwise distances between complete lipidomes to provide a structural lipidome homology metric that reflects lipid structural diversity, biosynthetic pathway differences, and environmental interactions.

Key Features:

• Homology Metric: Introduces a lipidome homology metric that captures structural diversity within complete lipidomes.
• SMILES Conversion: Converts lipid structures into SMILES (Simplified Molecular Input Line Entry System) format for consistent representation of lipid-specific structural diversity.
• Structural Similarity: Determines structural similarity between molecular species using sequence analysis algorithms, with the Levenshtein distance identified as optimal for quantifying structural changes.
• Chemical Space Model: Describes lipidomes within a chemical space model in which lipid molecules from databases such as LIPIDMAPS form clusters corresponding to conventional chemical families.
• Hausdorff Distance Basis: Calculates the degree of overlap between lipidome pairs using the Hausdorff distance, forming the basis of the LUX Score metric.

Scientific Applications:

• Yeast Strains: Applied to yeast strains with known genetic alterations in fatty acid synthesis to reflect genetic relationships and growth condition effects on lipidomes.
• Drosophila Lipidomes: Clusters larval tissue lipidomes of Drosophila to highlight the impact of nutritional changes without prior structural diversity information.
• Comparative Lipidomics Across Species: Facilitates comparative lipidome studies across species borders by providing a structural homology metric.

Methodology:

Lipid structures are converted to SMILES, structural similarity is assessed using sequence analysis algorithms with the Levenshtein distance, lipidomes are represented in a chemical space with clustering (e.g., LIPIDMAPS), and pairwise overlap is quantified using the Hausdorff distance to produce the LUX Score.