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- Ahola, Virpi, et al.
(författare)
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The Glanville fritillary genome retains an ancient karyotype and reveals selective chromosomal fusions in Lepidoptera
- 2014
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 5, s. 4737-
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Tidskriftsartikel (refereegranskat)abstract
- Previous studies have reported that chromosome synteny in Lepidoptera has been well conserved, yet the number of haploid chromosomes varies widely from 5 to 223. Here we report the genome (393 Mb) of the Glanville fritillary butterfly (Melitaea cinxia; Nymphalidae), a widely recognized model species in metapopulation biology and eco-evolutionary research, which has the putative ancestral karyotype of n = 31. Using a phylogenetic analyses of Nymphalidae and of other Lepidoptera, combined with orthologue-level comparisons of chromosomes, we conclude that the ancestral lepidopteran karyotype has been n = 31 for at least 140 My. We show that fusion chromosomes have retained the ancestral chromosome segments and very few rearrangements have occurred across the fusion sites. The same, shortest ancestral chromosomes have independently participated in fusion events in species with smaller karyotypes. The short chromosomes have higher rearrangement rate than long ones. These characteristics highlight distinctive features of the evolutionary dynamics of butterflies and moths.
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| 2. |
- Wrzaczek, Michael, et al.
(författare)
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Transcriptional regulation of the CRK/DUF26 group of Receptor-like rotein kinases by ozone and plant hormones in Arabidopsis
- 2010
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Ingår i: BMC Plant Biology. - : Springer Science and Business Media LLC. - 1471-2229. ; 10, s. 95-
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Tidskriftsartikel (refereegranskat)abstract
- Background: Plant Receptor-like/Pelle kinases (RLK) are a group of onserved signalling components that regulate developmental programs and esponses to biotic and abiotic stresses. One of the largest RLK groups s formed by the Domain of Unknown Function 26 (DUF26) RLKs, also called ysteine-rich Receptor-like Kinases (CRKs), which have been suggested to lay important roles in the regulation of pathogen defence and rogrammed cell death. Despite the vast number of RLKs present in lants, however, only a few of them have been functionally haracterized. esults: We examined the transcriptional regulation of all Arabidopsis RKs by ozone (O(3)), high light and pathogen/ elicitor reatment-conditions known to induce the production of reactive oxygen pecies (ROS) in various subcellular compartments. Several CRKs were ranscriptionally induced by exposure to O(3) but not by light stress. (3) induces an extracellular oxidative burst, whilst light stress leads o ROS production in chloroplasts. Analysis of publicly available icroarray data revealed that the transcriptional responses of the CRKs o O(3) were very similar to responses to microbes or athogen-associated molecular patterns (PAMPs). Several mutants altered n hormone biosynthesis or signalling showed changes in basal and (3)-induced transcriptional responses. onclusions: Combining expression analysis from multiple treatments with utants altered in hormone biosynthesis or signalling suggest a model in hich O(3) and salicylic acid (SA) activate separate signaling pathways hat exhibit negative crosstalk. Although O(3) is classified as an biotic stress to plants, transcriptional profiling of CRKs showed trong similarities between the O(3) and biotic stress responses.
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