The genomic landscape of adaptation to a new host plant DOI Creative Commons
Rachel Steward, Kalle J. Nilsson, Jesús Ortega

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Апрель 18, 2023

Abstract Adaptation to novel ecological niches is known be rapid. However, how the loci underlying divergence are coupled traits reproductively isolating populations, ultimately enabling formation of persistent species, remains a consequential question in speciation research. Here, we investigated genomic differences underpinning colonization new niche and two partly sympatric host races Tephritis conura peacock flies. We took advantage independent zones west east Baltic Sea, where plant specialists using thistle species Cirsium heterophyllum C. oleraceum co-occur, address what regions genome maintain parallel. Using genome-wide association, differentiation statistics, identified large, highly divergent region associated with use among western eastern populations. Within this region, unique haplotypes each race, indicative large inversion, adding growing body evidence that structural changes important for adaptations persist face gene flow. further showed strong signatures selection especially populations derived specialist race. The also had reduced introgression, while rest signs extensive Genes within differentiated windows putative inversion were not only enriched functions involved adaptation, including phenology metabolic responses different metabolites plants, but gametogenesis, fertilization embryological development, all which suggest sequence could have consequences on reproductive isolation between races. In conclusion, study suggests may facilitate races, speciation,

Язык: Английский

Diverse pathways to speciation revealed by marine snails DOI Creative Commons
Kerstin Johannesson, Rui Faria, Alan Le Moan

и другие.

Trends in Genetics, Год журнала: 2024, Номер 40(4), С. 337 - 351

Опубликована: Фев. 22, 2024

Speciation is a key evolutionary process that not yet fully understood. Combining population genomic and ecological data from multiple diverging pairs of marine snails (Littorina) supports the search for speciation mechanisms. Placing on one-dimensional continuum, undifferentiated populations to species, obscured complexity speciation. Adding axes helped describe either routes or reproductive isolation in snails. Divergent selection repeatedly generated barriers between ecotypes, but appeared less important completing while genetic incompatibilities played role. Chromosomal inversions contributed barriers, with variable impact. A multidimensional (hypercube) approach supported framing questions identification knowledge gaps can be useful understand many other systems.

Язык: Английский

Процитировано

9
Chromosome-scale genome assembly of the rough periwinkleLittorina saxatilis DOI Creative Commons
Aurélien De Jode, Rui Faria, Giulio Formenti

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Фев. 5, 2024

Abstract The intertidal gastropod Littorina saxatilis is a model system to study speciation and local adaptation. repeated occurrence of distinct ecotypes showing different levels genetic divergence makes L. particularly suited stages the continuum in same lineage. A major finding presence several large chromosomal inversions associated with and, specifically, species offers role this divergence. genome 1.35Gb composed 17 chromosomes. first reference was assembled using Illumina data, highly fragmented (N50 44kb) quite incomplete, BUSCO completeness 80.1% on Metazoan dataset. linkage map one full-sibling family enabled placement 587 Mbp into groups corresponding haploid number chromosomes, but nature limited understanding interplay between divergent selection gene flow during ecotype formation. Here we present newly generated that contiguous, N50 67 Mb 90.4% total assembly length placed super-scaffolds. It also complete 94.1 % Metazoa This new will allow for investigations genomic regions implicated formation as well better characterization their speciation. Significance rough periwinkle, has become adaptation, evolutionary innovation speciation, including these processes. Chromosomal have been identified other providing valuable opportunity investigating origin evolution. Here, chromosome-scale from long reads HiC chromatin proximity mapping replacing an earlier genome. enable detailed how contribute adaptation reproductive isolation related taxa, studies effects individual loci within outside inversions.

Язык: Английский

Процитировано

1
The genomic landscape of adaptation to a new host plant DOI Creative Commons
Rachel Steward, Kalle J. Nilsson, Jesús Ortega

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Апрель 18, 2023

Abstract Adaptation to novel ecological niches is known be rapid. However, how the loci underlying divergence are coupled traits reproductively isolating populations, ultimately enabling formation of persistent species, remains a consequential question in speciation research. Here, we investigated genomic differences underpinning colonization new niche and two partly sympatric host races Tephritis conura peacock flies. We took advantage independent zones west east Baltic Sea, where plant specialists using thistle species Cirsium heterophyllum C. oleraceum co-occur, address what regions genome maintain parallel. Using genome-wide association, differentiation statistics, identified large, highly divergent region associated with use among western eastern populations. Within this region, unique haplotypes each race, indicative large inversion, adding growing body evidence that structural changes important for adaptations persist face gene flow. further showed strong signatures selection especially populations derived specialist race. The also had reduced introgression, while rest signs extensive Genes within differentiated windows putative inversion were not only enriched functions involved adaptation, including phenology metabolic responses different metabolites plants, but gametogenesis, fertilization embryological development, all which suggest sequence could have consequences on reproductive isolation between races. In conclusion, study suggests may facilitate races, speciation,

Язык: Английский

Процитировано

3