
INVESTIGATION OF TLR4 POLYMORPHISM IN CHILDREN WITH VESICOURETERAL REFLUX AND RENAL SCARRING Sav NM1*, Eroz R2, Kalay Duran N3, Kilicaslan O4, Erisen Karaca S5 *Corresponding Author: *Corresponding Author: Nadide Melike SAV, Address: Duzce Universitesi Araştırma Uygulama Hastanesi, Pediatrik Nefroloji B.D, Merkez, DUZCE, TURKEY; Phone: +905378683281; Fax:+903805421390; e-mail address: savmelike@gmail.com page: 41
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INTRODUCTION
Urinary tract infection (UTI) is an important health
problem that is commonly seen in children and has short
and long-term complications. One of the common causes
of the disease is vesicoureteral reflux. Vesicoureteral reflux
(VUR) is a pathology characterized by reflux of urine ac-
cumulated in the bladder from one or both ureters to the
kidney as a result of anatomical disorders [1]. Primary
VUR occurs due to poor development and dysfunction of
the congenital ureterovesical junction whereas secondary
VUR occurs due to increased intravesical pressure [2].
Primary VUR is seen in 1-2% of the pediatric popula-
tion; however, this rate rises to 30-40% in the presence of
urinary tract infections, and recurrent UTI is an important
cause of renal parenchymal damage [3]. Bacterial infection
in the renal parenchyma causes an acute inflammatory
reaction, accelerating scar formation and progression to
chronic kidney disease (CKD) [4].
Many studies reported that resistance to bacterial
UTIs is controlled by some genes. Among these genes,
toll-like receptors (TLR) are transmembrane proteins in-
volved in the innate immune response. Single gene de-
fects or variations in genes encoding TLR, chemokines,
and chemokine receptors alter the susceptibility of the
host to urinary pathogen invasion [5]. TLR4 is the first
toll-like receptor identified in humans and is expressed in
monocytes and dendritic cells. TLR4 recognizes bacterial lipopolysaccharides and contributes to host defense against
Gram-negative bacteria [6].
Different polymorphisms in the TLR4 gene cause UTI
facilitates the emergence of the disease, and may pave
the way for CKD in the long term. Identification of these
polymorphisms will enable accurate genetic counselling
and rapid screening of individuals with risk factors. This
study aimed at analyzing TLR4 gene polymorphisms in
pediatric patients with recurrent UTI and VUR using Next
Generation Sequencing (NGS).
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