Method to extract animal genomic dna
With the development of DNA sequencing technology, genome research on arthropods (such as insects and arachnids) has become more extensive and in-depth. Obtaining high-quality genomic DNA is an important basis for subsequent research. Arthropods are rich in chitin, which is a barrier for a large number of phenol-chloroform-based DNA extraction methods that are suitable for normal samples. Besides, DNA extraction kits based on silica film are low efficient and expensive. Therefore, we analyzed the defects of traditional DNA extraction methods that restrict the increase in yield and purity, combining with the characteristics of target samples, to improve the DNA extraction method. Finally, we invented a method that is powerful for DNA extraction from chitin-rich samples of animals, such as arthropods.
Artificial indoor breeding of nymphalidae
After many years of research, we have established a set of methods for indoor breeding and propagation of Nymphalidae under completely artificial conditions, which overcomes the key technical problem of how to effectively reproduce when Nymphalidae is cultivated indoors. Specifically, in the first aspect, the present invention provides a method for rearing and breeding Nymphalidae which means that breeding and breeding are carried out indoors. We use airflow to assist the mating of Nymphalidae. "Indoor" refers to the open space, open-air cultivation or semi-open-air environment of the butterfly's natural growth environment. It means that the butterfly is in a fully enclosed space under completely artificial conditions and is not required at any stage of a complete life history. Is placed in a natural environment. Both rearing and breeding are carried out indoors, which means that the breeding of the butterfly's complete life history is completed under fully artificial or fully artificial conditions, and the normal reproduction close to the natural state can be realized.
A deep learning-based approach for inferring complex evolutionary histories
Resolving the relationships among taxa is one of the fundamental tasks of evolutionary biology. With the development of sequencing technologies and algorithms, more hybridization events between species have been found, which suggests the strict bifurcation phylogenetic trees can not represent the full evolutionary history of species.
Recently, deep learning algorithms have shown remarkable potential for solving population genetics problems. Therefore, we provide a deep learning-based approach using comparative or population genomic data to infer topology structures among species. Simulated sequence data are used to train and test the convolutional neural network; and real genomic data are analyzed based on the trained neural network, combing with other population genetic analyses to determine the evolutionary relationships and introgression loci between taxa.
CRISPR/Cas9 gene editing in spiders
The CRISPR/Cas9 system has been widely used to edit genome sequences, which is useful for understanding the functions of target genes in many species, including diverse arthropods. However, there is no application of CRISPR/Cas9 system in the spiders, a basal arthropod group. Here, we show a CRISPR/Cas9 mediated knockout mutations of Hox genes in the common house spider Parasteatoda tepidariorum. Our results establish CRISPR in spiders that make a contribution to understand the genetic basis of appendages and study the origin and evolution of these features.