Banca de DEFESA: ELISEU JAYRO DE SOUZA MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELISEU JAYRO DE SOUZA MEDEIROS
DATE: 30/11/2021
TIME: 08:30
LOCAL: meet.google.com/wdk-jacd-qna
TITLE:

Genetic basis associated with the serological classification of Leptospira: a case of study of Sejroe serogroup

KEY WORDS:

Cross reactions, Leptospirosis, Lipopolysaccharides, O-antigens, rfb locus.

PAGES: 51
BIG AREA: Ciências Biológicas
AREA: Biologia Geral
SUMMARY:

Leptospirosis is a widely distributed zoonosis caused by pathogenic strains of bacteria of the genus Leptospira (Phylum Spirochaetes). Its agents are commonly classified based on their antigenic characteristics into serogroups and serovars, which are relevant for epidemiologic studies and vaccine development. However, the methods used for this are considered laborious and require a specialized infrastructure. Some molecular methods were proposed to accelerate these procedures, but they still can not replace the immunological tests, thus requiring a further understanding of the genetic basis underlying the serological classification. In this work, we focused on elucidating the genetic factors determinant for the serogroup Sejroe, which is one of the most prevalent serogroups in livestock. For this, we conducted a comparative genomic analysis using more than 700 leptospiral samples available in the public database. The analysis showed that the genes comprising the rfb locus are the main genetic factors associated with the serological classification. Samples from the Sejroe serogroup have an rfb locus with a conserved gene composition that differs from most other serogroups. Hebdomadis and Mini were the only serogroups whose samples have rfb locus with similar gene composition to those from serogroup Sejroe, corroborating with the serological affinity shared by them. Finally, we could determine a small region in the rfb locus in which each of those three serogroups can be distinguished by its gene composition. This is the first work that uses an extensive repertoire of genomic data of leptospiral samples to elucidate the molecular basis of the serological classification and open the road to more reliable strategies based on molecular methods for serodiagnosis.

BANKING MEMBERS:
Presidente - 3063244 - TETSU SAKAMOTO
Interno - 2170415 - JORGE ESTEFANO SANTANA DE SOUZA
Externa à Instituição - ANNA MONTEIRO CORREIA LIMA - UFU
Externa à Instituição - Maria Raquel Venturim Cosate