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Some Rare Decays of Particles within R-Parity Violating Super-Symmetric Model

Thesis Info

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Author

Mir, Azeem

Program

PhD

Institute

COMSATS University Islamabad

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2010

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1164

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727205843

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Some Rare Decays of Particles within R-parity violating Super-symmetric Model This thesis compares experimental studies of two and three body leptonic decays of mesons (B and K) with theoretical predictions of R-parity violating Minimal Supersymmetric Standard Model. Observables like branching fraction, forward backward asymmetry and polarization asymmetry are studied regarding these decays. Forward backward asymmetry is found to be significant in the case of K ± → π ± μ+μ− only and vanishingly small in case of B ± → K ± μ+μ−. Polarization asymmetry has also been studied in this research work. It is found to be significant only for two body leptonic decays and comparable with standard model in case of three body leptonic decay of mesons. An error analysis of the branching fraction and CP-asymmetry has also been made for three body leptonic decay of mesons. Theoretical predictions for both branching fraction and CP-asymmetry agree well with present experimental data.
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Molecular Genetic Characterization of Hereditary Neuromuscular Disorders in Pakistani Families

Hereditary neuromuscular disorders are a clinically and genetically heterogeneous group of genetic conditions that affect about 1 in 1000 individuals worldwide. These diseases affect the muscles and their direct nervous system control. The conditions are characterized by progressive muscle degeneration and weakness and constitute a great disease burden. Genetic defects in the proteins that maintain the motor demand and neural inputs lead to neuromuscular disorders. This study was aimed to explore the genetic cause of four neuromuscular disorders identified in five Pakistani families using whole exome and Sanger sequencing. Genomic DNA was extracted from peripheral blood of the recruited families. Whole exome paired-end sequencing was performed by generating 51 Mb Sure Select V4 libraries. DNA shearing, hybridization using RNA-based library baits, target capture and bridged amplification were subsequently carried out. 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The proband of the family A [lab ID: NP-08] affected with autosomal dominant familial hypokalemic periodic paralysis (hypoKPP) was subjected to whole exome sequencing. A heterozygous missense variant (c.919A>G; p.Met307Val) was found in KCNJ2. Sanger sequencing verified the variant segregation in the family with disease phenotype with incomplete penetrance. The bioinformatics tools ranked the p.Met307Val change in KCNJ2 as deleterious. The variant was conserved in the 100 vertebrate species and is the likely cause of the hypoKPP in the Pakistani family. This investigation expands the underlying genetic etiology of familial hypoKPP. The proband of the family B [lab ID: NP-05] affected with autosomal recessive Charcot- Marie-Tooth disease type II was subjected to whole exome sequencing. A homozygous missense variant (c.1591C>A; p.Pro531Thr) in IGHMBP2 was shortlisted. Sanger sequencing revealed full segregation of the variant with the disease phenotype in the family. The parents of the affected individuals were heterozygous for the position. In silico analysis of the c.1591C>A substitution predicted deleterious effect on the protein structure and function. The variant was conserved in the vertebrate species. We conclude that IGHMBP2 c.1591C>A variant is the likely cause of the CMT2 disease in the family. Whole exome sequencing of the proband of the family C [lab ID: NP-07] affected with autosomal recessive Charcot-Marie-Tooth disease type IV was performed. No variant was found in the genes previously linked to neuromuscular disorders. Following disease model and tissue and organ specific expression, three rare candidate variants were shortlisted including compound heterozygous variant (c.874_875insGA, p.Lys292fs; c.871_872delCG, p.Arg291fs) in HADHA, homozygous missense mutation (c.2062C>T; p.Arg688Cys) in SLC6A6 and homozygous missense variant (c.63917G>A; p.Arg21306His) in TTN. However, none of the variants cosegregated with the disease phenotype in the family. These results support the evidence of further genetic heterogeneity in CMT disease. We believe that a hitherto unidentified genetic or epigenetic factor is the cause of the disease in the family. The families D [lab ID: NP-12] and E [lab IDs: NP-13] affected with autosomal recessive infantile-onset Pompe disease (IOPD) were subjected to Sanger sequencing. Short oligonucleotide sequences were used to screen GAA in both the families. A rare novel homozygous missense c.2561G>A variant was found segregating in the family D. The parents were carriers for this variant. While a rare heterozygous variant (c.2773 A>C) in GAA was identified in the family E. The genotype of the mother was heterozygous for the variant but no GAA variant identified in the father. The other unidentified variant in the family may be present in the promoter or regulatory sequence. The variants were not present in our in-house database of the local unrelated healthy population. Different bioinformatic tools predicted the identified variants to have deleterious effects on GAA protein structure and function. The variants are also conserved in the vertebrate species. We suggest that these GAA variants are the likely cause of IOPD in these families. In conclusion, the study highlights the clinical significance of whole exome sequencing in the molecular diagnosis of heterogeneous hereditary neuromuscular diseases. The data should also help in the prenatal diagnosis and improved genetic counselling of the families.