The oligomeric assembly of galectin-11 is critical for anti-parasitic activity in sheep (Ovis aries).

Galectins are a family of glycan-binding molecules with a characteristic affinity for s-D-glycosides that mediate a variety of important cellular functions, including immune and inflammatory responses. Galectin-11 (LGALS-11) has been recently identified as a mediator induced specifically in animals against gastrointestinal nematodes and can interfere with parasite growth and development. Here, we report that at least two natural genetic variants of LGALS-11 exist in sheep, and demonstrate fundamental differences in anti-parasitic activity, correlated with their ability to dimerise. This study improves our understanding of the role of galectins in the host immune and inflammatory responses against parasitic nematodes and provides a basis for genetic studies toward selective breeding of animals for resistance to parasites. Sakthivel et al. report two natural genetic variants of galectin-11 in sheep and demonstrate that their ability to dimerise correlates with the differences in their anti-parasitic activity that triggers larval arrest. This study provides a basis for genetic studies toward selective breeding of animals to improve their resistance to parasites.