Abstract
Background: Extended spectrum β-lactamase (ESBL)-producing Escherichia coli (ESBL-EC) constitute an emerging public-health concern. Consider that ESBL genes type CTX-M types has been increased significantly in most parts of the world. Few data are available on the CTX-M variants circulating in Sudan. Objective: This study used polymerase chain reaction (PCR) and bioinformatics tools to identify blaCTX-M and its variants for Extended-spectrum β-lactamase (ESBLs) producing clinical isolates of Escherichia coli (E. coli) obtained from hospitals in Khartoum-Sudan. Methods: A total of 216 non-repetitive isolates were selected during 2007-2018. The phenotypic identification of ESBL production was confirmed according to CLSI guidelines. CTX-M genotype was analyzed by uniplex PCRs reactions subsequently sequences performed later sequences were analyzed using bioinformatics tools with nBLAST program, multiple alignments to determine CTX-M genotype variants . Nucleotide sequences were submitted to Gen Bank and accession numbers were obtained. Result: ESBL phenotype among 212 confirmed E.coli isolates was (34.9% of 212,n=74). (62.2% of 74, n=46) strains carried bla CTX-M genes, CTX-M genotype variants identified in this study as followed: blaCTX-M-15 gene was the most prevalent one (78.6%) followed by blaCTX 90 (14.3%) and CTX-M55 (7.1%),
 Conclusion: This study reveled high ESBL occurrence among E.coli isolates, with CTX-M 15 the predominant variants and highlights the incidence of CTX-M-55 for the first time from Sudan.
 Keywords: E. coli, PCR, ESBLs, CTX-M, Sudan, bioinformatics
Highlights
Extended spectrum β-lactamase (ESBL)-producing Escherichia coli (ESBL-EC) constitute an emerging public-health concern
The predominant mechanism for acquired resistance to β-lactams in Escherichia coli is the synthesis of plasmid-borne extendedspectrum β-lactamases (ESBLs), extended-spectrum beta-lactamases (ESBL)
This study presented the epidemiology of CTXM E. coli from four hospitals in different localities of Khartoum state – Sudan
Summary
Extended spectrum β-lactamase (ESBL)-producing Escherichia coli (ESBL-EC) constitute an emerging public-health concern. Few data are available on the CTX-M variants circulating in Sudan. Objective: This study used polymerase chain reaction (PCR) and bioinformatics tools to identify blaCTX-M and its variants for Extended-spectrum β-lactamase (ESBLs) producing clinical isolates of Escherichia coli (E. coli) obtained from hospitals in Khartoum-Sudan. Result: ESBL phenotype among 212 confirmed E.coli isolates was (34.9% of 212,n=74). (62.2% of 74, n=46) strains carried bla CTXM genes, CTX-M genotype variants identified in this study as followed: blaCTX-M-15 gene was the most prevalent one (78.6%) followed by blaCTX 90 (14.3%) and CTX-M55 (7.1%), Conclusion: This study reveled high ESBL occurrence among E.coli isolates, with CTX-M 15 the predominant variants and highlights the incidence of CTX-M-55 for the first time from Sudan.
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