Lerdchai Chintapitaksakul. Transcriptional response of black tiger shrimp haemocytes in response to yellow head virus infection . Master's Degree(Molecular Genetics and Genetic Engineering). Mahidol University. : Mahidol University, 2003.
Transcriptional response of black tiger shrimp haemocytes in response to yellow head virus infection
Abstract:
Black tiger prawn, Penaeus monodon, is one of the world's economically most
important marine organism. It is currently mainly supplied by some ten thousand
aquaculture farms in Asia and the Pacific coastal regions. With the multibillion dollar
size of the shrimp business, heavy losses of farmed shrimp have resulted from a
number of pathogens, including yellow-head virus, and white spot syndrome virus.
Despite numerous studies on viruses and some understanding of the functions of the
shrimp’s innate immune system, no literature has been available on the shrimp host
response at the molecular level to an infecting virus. This study aimed to survey
possible transcriptional alterations of the shrimp’s haemocytes, the major defense
related cells, after they were infected by yellow-head virus in the laboratory. A
collection of cDNA clones of putatively known DNA sequence were selected from
our laboratory's cDNA libraries to be used as hybridization targets in a grid pattern.
DNA inserts from 96 cDNA clones were prepared by polymerase chain reaction, and
then spotted into a grid pattern on GeneScreen Plus nylon membranes. They were then
hybridized with radioactively-labeled probes prepared from mRNA isolated from
three haemocytes preparations: 1) collected at 0 hour with no injection; 2) collected
24-hours after buffer injection at 0 hour; and 3) and 24-hours after yellow head virus
infection at 0 hour. Spots showing different intensities in autoradiograms among the
three sets of probes were confirmed in a second experiment. Results from the two sets
of experiments showed that transcripts probed by clones PMC0252 and PMC0238, of
putatively known identities as clathrin light chain and selenoprotein W respectively,
decreased, while clones PMCP423 and NF229 also putatively known identities as
innexin (or prp33) and chitinase respectively, increased. We also confirmed the cDNA
sequence of the PMC0238, in particular the 3' untranslated region revealing this
sequence showed the presence of a conserved sequence motif characteristic of
selenoprotein W. In this study I found that in response to infection by yellow-head
virus the black tiger prawn’s amount of mRNA encoding innexin (or prp33) and
chitinase increased and amount of mRNA encoding clathrin light chain and
selenoprotein W decreased.