Andreas Hejnol

This study characterizes the photosymbiotic relationship between Convolutriloba macropyga and Tetraselmis algae, showing distinct spatial and functional interactions between symbionts and host tissues.

This study shows that acoels lack conserved immune genes, leading to increased pathogen susceptibility in photosymbiotic species.

This study identifies and characterizes Cilin, an ancient metazoan intermediate filament protein, showing its role in cilia arrangement and tissue architecture across ctenophores and other animals.

The paper shows that xenacoelomorph male gonopore expresses bilaterian hindgut marker genes, suggesting it is homologous to the bilaterian anus.

The paper identifies a brachiopod DEG/ENaC/ASIC channel activated by diarylamidines, distinct from other known ligand-gated channels.

This study shows that ecdysteroid hormones regulate molting in tardigrades, supporting an ancestral role in ecdysozoans and identifying a neural center for molting regulation.

This study examines the combinatorial Wnt signaling patterns in brachiopod embryos, identifying conserved and variable gene expression across the anteroposterior axis.

The paper analyzes maternal gene expression patterns across 43 species to identify evolutionary signatures linked to reproductive modes.

The paper shows that temporal shifts in trunk formation underpin larval diversification in annelids and bilaterian life cycles through comparative genomic and transcriptomic analysis.

The paper identifies conserved genes involved in shell formation in brachiopods and molluscs, showing their orthologs in related phoronids and bryozoans, and finds gene loss in the latter groups.

This study investigates FGF signaling's role in mesoderm development across lophophorates, finding conserved molecular patterning but distinct spatial-temporal dynamics and an inductive role in mesoderm formation.

The paper decodes the compact genome of Dimorphilus gyrociliatus, revealing a conservative route to genome compaction with features similar to vertebrates.

This study describes Hox gene expression patterns during the embryonic and larval development of Phoronopsis harmeri, finding no expression during embryonic stages and delayed expression in larval structures.

The paper reports gene expression patterns in Phoronopsis harmeri, showing similarities to rhynchonelliform brachiopods in developmental patterning but also unique features.

This study identifies an excitatory peptide/CCHamide in nemertean larvae that increases ciliary beat frequency and alters vertical swimming distribution.

This study examines Hox gene expression in postmetamorphic juveniles of Terebratalia transversa to assess changes in expression patterns and collinearity after metamorphosis.

The paper reanalyzes two studies comparing gene expression across species, showing that pairwise comparisons can mislead conclusions about evolutionary processes by ignoring species relationships.

The paper introduces a urea-based in situ hybridization method that improves gene expression detection and reduces non-specific staining across multiple animal species.

The paper identifies an ancient FMRFamide-related neuropeptide and its receptor that induce coordinated defensive behaviors in brachiopod larvae.

The paper describes the cell lineage and molecular patterning in the bryozoan Membranipora membranacea, showing that blastomere fates are conserved despite a shift from spiral to biradial cleavage.

The paper identifies thousands of hidden orthologs in flatworms using an automated pipeline, revealing their distribution and characteristics without correlation to evolutionary rate.

This study examines Hox gene clusters in brachiopods, finding they are not expressed collinearly and are linked to lophotrochozoan morphological features.

The paper examines engrailed expression in brachiopods, finding a non-segmental role in anterior boundary formation, suggesting an ancestral bilaterian function.