The purpose of the present study was to establish normal electroretinogram (ERG) parameters using 56 normal eyes of four dog breeds common in Thailand: poodle, Labrador retriever, Thai ridgeback, and Thai Bangkaew. Standard ERG findings were bilaterally recorded using a handheld multi-species ERG unit with an ERG-jet lens electrode for 28 dogs under preanesthesia with diazepam, anesthesia with propofol, and anesthesia maintenance with isoflurane. There were significant differences in the mean values of ERG amplitudes and implicit times among the four dog breeds (p < 0.05) except for the b-wave implicit time of the photopic 30 Hz flicker response with 3 cd.s/m2 (p = 0.610). Out of the four breeds, Thai Bangkaew had the longest implicit time (p < 0.001) of scotopic low intensity responses, b-wave of scotopic standard intensity responses (3 cd.s/m2), a-wave of the higher intensity response (10 cd.s/m2), and a-wave of the photopic single flash response (3 cd.s/m2). For the b/a ratio, only the ratio of the Cone response was significantly different among the different breeds. In this summary, normal ERG parameters for four dog breeds were reported. Data from the investigation supported the hypothesis that determination of breed-specific limits of normality for ERG responses is necessary for individual clinics and laboratories.
Animals ; Dogs/genetics/*physiology ; Electroretinography/veterinary ; Reference Values ; Retina/*physiology

OBJECTIVE: To investigate the polymorphism of 11 canine STR loci. METHODS: A fluorescent multiplex system with 11 STR loci (PEZ1, PEZ2, PEZ3, PEZ5, PEZ6, PEZ8, PEZ12, FH2010, FH2054, FH2132 and FH2611) was constructed independently and performed to amplify 105 samples from dogs. The character of these loci was analyzed with the PCR data. RESULTS: The distributions of genotypes and allele frequencies of 11 STR loci were obtained. The total power of discrimination for the 11 loci in canine population was 0.9999999 and the cumulative probability of exclusion was 0.9330621. The observed heterozygosity and polymorphism information content (PIC) were 0.502 and 0.640, respectively. CONCLUSION Each of the eleven canine STR loci has a high genetic polymorphism and can be applied for the parentage testing and individual identification. The fluorescent multiplex system is a reliable method in forensic application.
Alleles ; Animals ; Dogs/genetics* ; Forensic Genetics ; Gene Frequency ; Genotype ; Microsatellite Repeats/genetics* ; Polymorphism, Genetic

Color-dilution alopecia is a relatively uncommon hereditary skin disease seen in "Blue" and other color-diluted dogs. This syndrome is associated with a color-dilution gene. The initial clinical signs are the gradual onset of a dry, dull and poor hair coat quality. Hair shafts and hair regrowth are poor, and follicular papules may develop and progress to frank comedones. Hair loss and comedo formation are usually most severe on the trunk, especially color-diluted area on the skin. Six cases of color-dilution alopecia are reported in 3 months to 10 years old dogs. The breeds of dogs are blue Doberman Pinscher, Miniature Pinscher, Dachshund, and Schnauzer. Grossly, extensive partial hair loss was seen on the skin. Histopathologically, the epidermis is relatively normal but may be hyperplastic. Hair follicles are characterized by atrophy and distortion. Heavily clumped melanin is present in the epidermis, dermis and hair follicles.
Alopecia/genetics/*veterinary ; Animals ; Dog Diseases/*genetics ; Dogs ; Female ; Hair Color/*genetics ; Male ; Skin/pathology

The study was purposed to prepare the recombinant lentiviral vector pTK161 and pTK162 carrying B-domain-deleted canine factor (BDDcFVIII) gene, and to investigate whether the canine FVIII (cVIII) can be expressed in vitro. The BDDcFVIII gene was ligated behind PUB and 2OH1 promotors to create lentiviral vectors pTK161 and pTK162. Meantime lentiviral vectors pTK161' and pTK161' were produced by cloning a green fluorescent protein (GFP) into pTK151 and pTK152, which was driven by PUB and 2OH1 promotors respectively. Vector supernatant were prepared by using transfer calcium phosphate mediated-cotransfection of 293T cells. The virus vector, DeltaNRF packaging-plasmid, and VSV-G envelope-plasmid was assayed by titers and cFVIII activity in cell culture supernatant after infection into 293T cells. pTK161, pTK162, pTK161' and pTK161' were identified by restriction enzyme analyzing. The results showed that the lentiviral vectors pTK161, pTK162, pTK161' and pTK161' were successfully constructed, and the titers of pTK161' and pTK161' reached to 1.54 x 10(6) U/ml and 2.83 x 10(6) U/ml; the activity of cFVIII could be detected at 24 hours after infection of 293T cells by pTK161 and pTK162, and achieved the highest level at 72 hours later. The higher level of cFVIII activity was achieved by transfected with pTK162 than that of pTK161 (p < 0.05), which closed to the cFVIII activity in normal dog plasma. 1/4 of the highest level could be detected 6 weeks later. It is concluded that the prepared HIV1-based lentiviral vectors can infect 293T cells to express cFVIII effectively. The results provide the basis for further studying HIV-1-based lentiviral vector gene therapy for hemophilia A.
Animals ; Dogs ; Factor VIII ; biosynthesis ; genetics ; Genetic Vectors ; genetics ; HIV-1 ; genetics ; metabolism ; Recombinant Proteins ; biosynthesis ; genetics

OBJECTIVE: To explore the genetic polymorphisms of 16 STR loci from 449 Tibetan Mastiffs in order to set up gene polymorphism database of Tibetan Mastiff. METHODS: The PCR amplification was performed using the 16 STR loci fluorescent multiple amplification kit for dog. The amplified products were detected and statistically analyzed. RESULTS: In the 16 STR loci from 449 Tibetan Mastiffs, CDP was 0.999 999 999 999 999 and CEP was 0.999 997 795. Except FH2010 (10 alleles), PEZ21 (12 alleles), and PEZ05 (13 alleles), the other STR loci had more than 15 alleles. In the 16 STR loci, H was > 0.5 and PIC was > 0.7. CONCLUSION The 16 STR loci have high polymorphism to be suitable for individual identification and paternity testing of Tibetan Mastiff. The data obtained through this study can be used to establish DNA polymorphism database of Tibetan Mastiff.
Alleles ; Animals ; Dogs/genetics* ; Gene Frequency ; Genetic Loci/genetics* ; Heterozygote ; Microsatellite Repeats/genetics* ; Polymerase Chain Reaction ; Polymorphism, Genetic

OBJECTIVETo observe the expression of receptor activator of NF-κB ligand (RANKL) and its decoy receptor osteoprotegerin (OPG) during unloading period of dental implants.

METHODSAn animal model of dental implants was established in Beagle dogs. Bone remodeling was tested at 3, 7, 15, 30, 60 and 90 days after the placement of implants. RANKL and OPG mRNA expression were quantified by real-time PCR. Then mandibular bones were resected and some sections were observed.

RESULTSThe most prominent period of bone remodeling occurred at 7 day after the placement of implants (OPG/RANKL mRNA, 2.15 ± 0.1). The expression of RANKL and OPG increased in a time-dependent manner in both soft and hard tissue. After 7 days they gradually decreased.

CONCLUSIONSBoth OPG and RANKL were expressed in peri-implant tissues, and the changing tendency of RANKL and OPGmRNA was consistent with the change of bone remodeling. The active stage for bone remodelling in peri-implant tissues during unloading period is about 7 days after implantation.

Animals ; Bone Remodeling ; genetics ; Dental Implantation ; Dogs ; Male ; Osteoprotegerin ; genetics ; metabolism ; RANK Ligand ; genetics ; metabolism ; RNA, Messenger ; metabolism

The fields of pharmacogenetics and pharmacogenomics have become increasingly promising regarding the clinical application of genetic data to aid in prevention of adverse reactions. Specific screening tests can predict which animals express modified proteins or genetic sequences responsible for adverse effects associated with a drug. Among the genetic variations that have been investigated in dogs, the multidrug resistance gene (MDR) is the best studied. However, other genes such as CYP1A2 and CYP2B11 control the protein syntheses involved in the metabolism of many drugs. In the present study, the MDR-1, CYP1A2 and CYP2B11 genes were examined to identify SNP polymorphisms associated with these genes in the following four canine breeds: Uruguayan Cimarron, Border Collie, Labrador Retriever and German Shepherd. The results revealed that several SNPs of the CYP1A2 and CYP2B11 genes are potential targets for drug sensitivity investigations.
Animals ; Aryl Hydrocarbon Hydroxylases/*genetics/metabolism ; Cytochrome P-450 CYP1A2/*genetics/metabolism ; Dogs/*genetics/metabolism ; P-Glycoprotein/*genetics/metabolism ; *Polymorphism, Single Nucleotide ; Steroid Hydroxylases/*genetics/metabolism

Mycoplasma species (spp.) are bacteria that are difficult to detect. Currently, the polymerase chain reaction (PCR) is considered the most effective diagnostic tool to detect these microorganisms in both human and veterinary medicine. There are 13 known species of human Mycoplasma and 15 species of canine Mycoplasma. Owing to the difficulties in identifying the individual species of Mycoplasma, there is a lack of information regarding which species are saprophytic and which are pathogenic. The prevalence of the individual species is also unknown. In addition, in both humans and dogs, the results of some studies on the impact of Mycoplasma are conflicting. The presence of Mycoplasma spp. on the epithelium of reproductive tract is often associated with infertility, although they are also detected in healthy individuals. The occurrence of Mycoplasma spp. is more common in dogs (even 89%) than in humans (1.3%-4%). This is probably because the pH of a dog's genital is more conducive to the growth of Mycoplasma spp. than that of humans. Phylogenetically, human and canine Mycoplasma are related, and majority of them belong to the same taxonomic group. Furthermore, 40% of canine Mycoplasma spp. are placed in common clusters with those of human. This suggests that species from the same cluster can play a similar role in the canine and human reproductive tracts. This review summarizes the current state of knowledge about the impact of Mycoplasma on canine and human male fertility as well as the prospects of further development in this field.
Humans ; Dogs ; Male ; Animals ; Mycoplasma/genetics* ; Infertility ; Semen Analysis ; Polymerase Chain Reaction/methods* ; Prevalence ; Semen/chemistry*

OBJECTIVETo study the rabies molecular biology features in animals between high incidence area of rabies and no rabies cases area in Hunan.

METHODSdetect saliva of dogs and brains of dogs and cats by direct immunofluorescence assay, review positive samples by RT-PCR, sequencing extract RNA virus for genetic analysis.

RESULTS12 were detected rabies virus antigen and positive nucleoside acid in 82 dogs from Wugang city also 1 in 17 from Dongkou county; the positive rate: Wugang 14.63 percent, Dongkou 5.88 percent. No rabies virus was detected in 67 samples of dog brains from Fenghuang County. Also none in 28 samples of cat brains. Amplificating N gene of rabies virus from positive samples of dog brain's tissue (No Wg13, Dk13) by RT-PCR, it shows that homology of nucleoside acid between two strain of virus is 99.4 percent; also 99.1 percent of amino acid. The homology of nucleoside acid (amonio acid) among Wg13 stain and Chinese strain CTN and aG strain is 89.4 percent (98.2 percent) and 86.1 percent (95.1 percent); The homology of nucleoside acid (amonio acid) among Dk13 stain Chinese strain CTN and aG strain is 89.1 percent (98.0 percent), 86.1 percent (94.9 percent).Compare with isolated rabies virus from abroad, the homology between two strains and Indonesia is 92.8 percent and 93.2 percent, the most similar of them. The strains isolated from other countries including Japan, Sri Lanka and India are relatively lower; The sequence of gene Wg13 and Dk13 were taken replacement of amino acid.

CONCLUSIONTwo strains are belong to type I rabies virus, comparing its N gene with current using vaccine strains, both are in same group, and homology are relatively higher.

Animals ; Cats ; Dogs ; Genes, Viral ; Phylogeny ; Rabies virus ; classification ; genetics ; Reverse Transcriptase Polymerase Chain Reaction

Animals ; Cattle ; Chickens ; DNA ; genetics ; Dogs ; Genome ; Humans ; Medicine, Chinese Traditional ; Mice ; RNA ; genetics ; Rabbits ; Swine ; Yin-Yang