Margrethe Johansen

ORCID: 0000-0003-1321-8546
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About
Contact & Profiles
Research Areas
  • Mollusks and Parasites Studies
  • Aquatic Invertebrate Ecology and Behavior
  • Parasite Biology and Host Interactions
  • Cephalopods and Marine Biology
  • Meat and Animal Product Quality

University of Nottingham
2023-2024

Molluscan mitochondrial genomes are unusual because they show wide variation in size, radical genome rearrangements and frequently high (> 10%) within species. As progress understanding this has been limited, we used whole sequencing of a six-generation matriline the terrestrial snail Cepaea nemoralis, as well sequences from wild-collected C. sister species hortensis, multiple other to explore origins DNA (mtDNA) variation. The main finding is that rate SNP heteroplasmy somatic tissue was...

10.1186/s12864-024-10505-w article EN cc-by BMC Genomics 2024-06-13

Abstract While the shell of land snail Cepaea nemoralis is typically classed as yellow, pink, or brown, reality that colour variation continuously distributed. To further understand origin continuous variation, we used crosses C. to compare quantitative measures with inferred genotype underlying supergene locus. We also a recently developed linkage map find trait loci may influence colour. The results show locus supergene—at around 31.385 cM on group 11—is involved in determining chromatic...

10.1093/jeb/voae093 article EN Journal of Evolutionary Biology 2024-07-27

Molluscs are a highly speciose phylum that exhibits an astonishing array of colours and patterns, yet relatively little progress has been made in identifying the underlying genes determine phenotypic variation. One prominent example is land snail Cepaea nemoralis for which classical genetic studies have shown around nine loci, several physically linked inherited together as 'supergene', control shell colour banding polymorphism. As first step towards involved, we used whole-genome...

10.1038/s41437-023-00648-z article EN cc-by Heredity 2023-09-27

Abstract Molluscs are a highly speciose phylum that exhibit an astonishing array of colours and patterns, yet relatively little progress has been made in identifying the underlying genes determine phenotypic variation. One prominent example is land snail, Cepaea nemoralis, for which classical genetic studies have identified around nine loci control shell colour variation, several physically linked inherited together as ‘supergene’. As first step towards characterising polymorphism, we used...

10.21203/rs.3.rs-2760735/v1 preprint EN cc-by Research Square (Research Square) 2023-04-28
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