Manual curation and phylogenetic analysis of chitinase family genes in the Asian citrus psyllid, Diaphorina citri
Abstract
Chitinases are enzymes that digest the polysaccharide polymer chitin. Chitin is a major component of insect exoskeletons, which must be replaced multiple times during growth and development in a process known as molting. Insect genomes usually have multiple chitinase genes, some of which are required for molting and some whose functions are still unknown. Since knockdown of the chitinases required for molting causes high levels of lethality, chitinase genes have drawn interest as targets for RNAi-based pest control methods. The Asian citrus psyllid, Diaphorina citri , carries the bacterium that causes Huanglongbing, also known as citrus greening disease, which is devastating the citrus industry worldwide. We have identified and annotated 12 chitinase family genes from D. citri as part of a community effort to create high quality gene models to facilitate the design of interdictory molecules for pest control. Using predicted protein domain content and phylogenetic analysis, we categorized the D. citri chitinases according to a previously established classification scheme and re-evaluated the classification of chitinases in other hemipterans. In addition to chitinases belonging to known groups, we identified a novel class of chitinases present in D. citri and several related hemipterans that appears to be the result of horizontal gene transfer.
Article activity feed
-
**Reviewer 2. Hai-Zhong Yu. **
Additional Comments. The manuscript presented by Shippy et al. revealed that chitinase family genes in Diaphorina citri. Chitin is widely distributed in nature and serves a variety of functions. In insects, chitin is a major structural component of the cuticle and peritrophic membrane, and plays an important role in molting; thus, chitin metabolism related genes can serve as a desired target for pest control. As described in background, chitinase plays an important role involved in digesting the polysaccharide polymer chitin. In the current study, the authors identified and annotated 12 chitinase family genes from D. citri and performed phylogenetic analysis. Additionally, the structural domains and expression patterns of D. citri chitinase genes were analyzed. In general, the manuscript can provide some …
**Reviewer 2. Hai-Zhong Yu. **
Additional Comments. The manuscript presented by Shippy et al. revealed that chitinase family genes in Diaphorina citri. Chitin is widely distributed in nature and serves a variety of functions. In insects, chitin is a major structural component of the cuticle and peritrophic membrane, and plays an important role in molting; thus, chitin metabolism related genes can serve as a desired target for pest control. As described in background, chitinase plays an important role involved in digesting the polysaccharide polymer chitin. In the current study, the authors identified and annotated 12 chitinase family genes from D. citri and performed phylogenetic analysis. Additionally, the structural domains and expression patterns of D. citri chitinase genes were analyzed. In general, the manuscript can provide some useful information for D. citri control. This manuscript can be accepted after solving the following questions. 1. According to Table 1, 12 chitinases were identified, including CHT3, CHT5-7, CHT10-1, CHT10-2, CHT11, IDGF1-3, ENGase and CHTPE. However, CHT1-2, CHT4 and CHT8-9 seem to be missing. Please give a proper explain. 2. I suggested that the author should verify the expression levels of these chitinase genes by qPCR or Western blot.
-
This work has been published in GigaByte under a CC-BY 4.0 license (https://doi.org/10.46471/gigabyte.46), and has published the reviews under the same license. These are as follows.
**Reviewer 1. Mary Ann Tuli **
Are all data available and do they match the descriptions in the paper?
As with the other manuscripts, OGS v3 is mentioned, but this is not get available from the CGEN. The data underlying table 4 and Fig 3 are available.
Additional Comments: This manuscript is a comprehensive description of the manual curation of the chitinase family genes, with clear aims and methodology.
-
-