Distribution of hla, hlb, hlgC, hld & cylA hemolysin genes and their alleles in different bacterial species isolated from the variant clinical sources in Basrah

Main Article Content

Zeena Hashim Abd Al-Wahid
Munaff Jawdat Abd Al-Abbas

Keywords

Hemolysis, Alleles , Alpha, Beta , Delta, Gamma, Mutation

Abstract

Hemolysin is the most important virulence factor responsible for defecting in the plasma membranes of various types of host cells. One hundred and twenty-eight samples were collected from different clinical sources showing 111 (86.72%) bacterial isolates including 24 different bacterial species identified by 16S rRNA sequencing. Most of bacterial isolates have the ability to lyse the blood cells,
delta hemolysin showed 50 (45.05 %) of isolates were positive on blood agar (BA), while 97 (87.39%) of isolates had the hld gene, followed by gamma 47(42.43%) on BA and 98 (88.28%) have of hlgC and 39 (35.14%) of isolates as beta on BA and 75 (67.57%) of hlb followed by alpha 37(33.33%) on BA and 46 (41.4%) of hla. Finally, 68 (61.26%) had the cytolysin A gene (cylA). The sequence of
hemolysins revealed different number of alleles for hla, hlb, hlg and hld except for the cylA gene containing one allele only. The hemolysins were detected in 24 different bacterial species in addition to S. aureus. hla showed a new spontaneous mutation containing a new allele recorded in the NCBI.

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