Background -Canine papillomavirus (CPV) has 20 described types associated with papillomas or squamous cell carcinoma (SCC). Knowledge about CPV diversity is scarce. Studies on papillomaviruses that infect other hosts show substantial diversity with some types and variants being associated with cancer.Hypothesis/Objectives -The aim of this study was to assess the genetic variability of the capsid L1 gene of CPV identified in lesions of naturally infected dogs from Brazil.Animals -Six dogs presenting with oral and cutaneous warts from different veterinary clinics in Sergipe state, Northeast Brazil.Methods and materials -Nine skin biopsy samples were collected for histopathological and molecular analyses. Bioinformatics tools were used for genotyping and diversity analysis. Mutations were characterized based on their impact on the L1 protein structure.Results -Sequences of CPV1 were obtained from exophytic papillomas. These sequences had at least five different mutations showing that all sequences were putative CPV1 variants. One CPV1 sequence, obtained from an oral SCC, had a highly destabilizing substitution in the L1 protein which was likely to be associated with changes in protein function.Conclusions and clinical importance -Despite the small number of cases analysed and the partial analysis of L1 nucleotide and amino acid sequences, this study has demonstrated diversity in CPV samples from Northeast Brazil. A putative new CPV1 variant associated with oral SCC, with novel protein structure changing mutations, was identified which may be important for understanding papillomavirus pathogenesis.
Introduction: Due to the importance of infant death caused by congenital malformations worldwide, more studies are necessary to determine the prevalence of these disorders serving as the basis for more effective control measures. Objective: To determine the prevalence and evaluate maternal risk factors for congenital malformations in newborns. Methods: A cross-sectional and retrospective study was performed in the reference maternity hospital for high-risk pregnancies in the state of Sergipe, northeastern Brazil. Data were collected from the medical records and declarations of live births of 16,518 births between January 2014 and December 2016, being included children with identified congenital malformations. Data were analyzed using the odds ratio, chi-square, and Fisher's exact test with p<0.05. Results: The study population was composed of 369 newborns with congenital malformations, which corresponds to 2.23% of total births. 53.9% were male, 47.9% had low birth weight and, 52.5% had adequate Apgar score. Anomalies affecting the musculoskeletal system were the most prevalent (30.9%), with polydactyly being the most frequent (53.5%). The number of prenatal consultations, education, and gestational age were the main observed maternal risk factors of congenital malformations. Anomalies of the circulatory system (OR=3.2 CI95% 1.3-7.84), multiple malformations (OR=9.24 CI95% 3.07-27.83), and chromosomal syndromes (OR=2.72 CI95% 1.48-5.01) were the most commonly associated with newborn deaths. Conclusion: The study presents the prevalence and risk factors related to malformations in the state of Sergipe, and improvements on maternal care and socioeconomic variables are important to decrease the number of malformations cases in Brazil.
Canis familiaris papillomavirus (CPV) is a member of the Papillomaviridae family and is found in dogs. After infection, the host can remain asymtomatic or develop benign ephitelial neoplasms such as papillomas and pigmented viral plaques, which can progress to cancer, in the form of squamous cell carcinoma (SCC). In humans, 227 types of human papillomavirus (HPV) have been described, with a well-established risk classification for cancer development. In addition, it is also known that variants of some high-risk HPV types may present different risks in respect of SCC development. In dogs, however, only a few types of CPV have been identified, despite the growing interest in this area, and knowledge on the genetic characterization of CPV variants is still scarce. Recent studies of CPV have shown that, as with HPV, benign neoplasia can develop into cancer, but it is believed that there are many more types and variants still to be described. Therefore, the aim of this study was to describe the genetics and biology of CPV, with the focus on what is known about lesions, geographic localization, virus types and variants.
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