Evaluation of Genotoxicity Induced by Low Dose Oral Exposure of Deltamethrin in Mice Model

The study was conducted to elucidate the genotoxic effect of deltamethrin in Swiss Albino male mice following oral exposure, by comet assay and micronuclei induction test. Deltamethrin was administered at the dose rate of 1.5 mg/kg bwt, 1.0 mg/kg bwt and 0.5 mg/kg body weight. Mean head DNA percentage, mean tail DNA percentage, mean tail length and mean olive moment were the endpoints for the comet assay. Deltamethrin resulted in a significant comet formation at 15, 30 and 60 days of oral exposure in a dose and time dependent manner. Mean tail DNA% at 15, 30 and 60 days of exposure to deltamethrin was 59.28, 57.74 and 63.14, respectively. The results were found to be significantly different in treatment groups as compared to the control groups. Micronucleated normochromatic erythrocytes, micronucleated polychromatic erythrocytes and polychromatic erythrocytes percentage were the endpoints for the micronuclei induction test. Deltamethrin induced significantly higher number of micronuclei in treatment group than the negative control. In conclusion, present study indicates that pesticides are slow poison and even a low dose of pesticide can cause genotoxicity and other biological effects when exposed to for longer duration.

Abnormal mitral valve apparatus in a case of hypertrophic obstructive cardiomyopathy: Intraoperative transesophageal echocardiography

Hypertrophic obstructive cardiomyopathy is a relatively common disorder that signifies asymmetric hypertrophy of interventricular septum causing obstruction of the left ventricular outflow tract (LVOT). However, more recent studies have shown that during ventricular systole, flow against an abnormal mitral valve apparatus results in drag forces on the part of the leaflets. The mitral leaflet is pushed into the LVOT to obstruct it. We present a case where intraoperative transesophageal echocardiography played a crucial role in defining the etiology of LVOT obstruction that subsequently helped in deciding the surgical plan.

case of deep vein thrombosis and intracranial sinus thrombosis possible rare complications of childhood abdominal tuberculosis

Severe pulmonary tuberculosis [TB] complicated by deep vein thrombosis [DVT] in adults has been reported previously in the medical literature; however, childhood extrapulmonary TB complicated by DVT is rare. We report a 13-year-old girl who presented to the Department of Pediatrics at the Postgraduate Institute of Medical Sciences in Rohtak, India, in 2012 with abdominal TB complicated by DVT and intracranial sinus thrombosis. She was treated with a course of four antitubercular drugs and short-term anticoagulation therapy with a positive outcome over the next six months. To the best of the authors' knowledge, no previous reports have yet suggested a possible association between childhood TB and intracranial sinus thrombosis

Molecular Cytogenetic Characterization of a Patient Diagnosed with Dimorphic Anemia Carrying De Novo Rare Ring Chromosome 7 along with T(7;9).

A case of a derivative chromosome 7 formed by a ring chromosome 7 and t(7;9) was found who presented with dimorphic anaemia with no other anomaly. Ring chromosome 7 was characterized by conventional and molecular cytogenetic techniques.

Molecular characterization of two Malaysian patients with Wiskott-Aldrich syndrome

The Wiskott-Aldrich Syndrome (WAS) is an X-linked immunodeficiency condition characterized by microthrombocytopenia, eczema and recurrent infections. It is caused by mutations in the Wiskott-Aldrich Syndrome protein (WASP) gene. We investigated two Malay boys who presented with congenital thrombocytopenia, eczema and recurrent infections. Here we report two cases of WASP mutation in Malaysia from two unrelated families. One had a novel missense mutation in exon 1 while the other had a nonsense mutation in exon 2. Both patients succumbed to diseaserelated complications. A differential diagnosis of WAS should be considered in any male child who present with early onset thrombocytopenia, especially when this is associated with eczema and recurrent infections.

Increased soluble HLA-DRB1 in B-cell acute lymphoblastic leukaemia

Soluble HLA (sHLA) are potential tumour markers released in order to counter immune surveillance. sHLA-class II is less known especially in acute lymphoblastic leukaemia (ALL). This study aimed to investigate soluble, surface and allelic expression of HLA Class II (sHLA-DR) in B-cell ALL patients and compare with soluble expression in normal individuals. A sandwich enzyme-linked immunosorbent assay (ELISA) was developed to measure soluble HLA-DRB1 in plasma. Flow cytometric analysis was performed to determine median fluorescence intensity in HLA-DR surface expression. HLA-DNA typing by polymerase chain reaction, sequence specific oligonucleotides, PCRSSO was performed to determine HLA-DRB1 type in ALL samples. Results showed sHLA-DRB1 (mean+SEM) was significantly increased (p=0.001) in plasma of ALL patients (0.260±0.057 μg/mL; n=30) compared to healthy controls (0.051±0.007μg/mL; n=31) of Malay ethnicity. However, these levels did not correlate with percentage or median fluorescence intensity of HLA-DR expressed on leukemia blasts (CD19+CD34+/-CD45loHLA-DR+) or in the normal B cell population (CD19+CD34- CD45hiHLA-DR+) of patients. No significant difference was observed in gender (male/female) or age (paediatric/adult). Only a trend in reduced sHLA was observed in patients carrying HLA-DR04. These results have to be validated with a larger number of samples.

Heterogeneous t(4;11) fusion transcripts in two infants with acute lymphoblastic leukemia

An RT-PCR assay detected the t(4;11) translocation in two infants with acute lymphoblastic leukemia (ALL). Case P76 was a 10-month-old, female infant, who presented with a WBC of 137.4 x 10(9)/l and a pre-pre-B ALL immunophenotype. Case P120 was a 6-month-old female infant, with a WBC > 615 x 10(9)/l and a pre-pre-B ALL immunophenotype. RT-PCR of cDNA from both these cases generated a 656 bp and a 542 bp respectively, which sequencing confirmed as t(4;11) fusion transcripts. The primers and conditions selected for this assay are compatible with a one-step multiplex PCR for the main translocations in childhood ALL.