Systemic lupus erythematosus (SLE) is an autoimmune disorder that is characterized by the production of antibodies directed against self-antigens, such as nuclear components. Genetic analyses of lupus patients have consistently demonstrated a complex genetic basis for disease susceptibility that involves multiple genes. Identifying genes and pathways that promote disease genesis has been aided by murine studies. In particular, congenic mouse studies that examine the role of chromosomal intervals from inbred lupus-prone mouse strains on a non-autoimmune background have been useful in dissecting the genetic contribution of novel susceptibility loci in lupus pathogenesis. In this thesis, the role of New Zealand Black (NZB) chromosomes 4 and 13 are examined in non-lupus prone C57BL/6 (B6) congenic mouse strains, denoted B6.NZBc4 and B6.NZBc13, respectively. Although repeatedly mapped to contain disease augmenting alleles,NZBc4 alone was not sufficient to initiate disease, despite an expansion of NKT and B1a cells���both with controversial pathogenic roles in lupus. Instead, by crossing the B6.NZBc4 mouse with another congenic mouse strain that develops fatal lupus autoimmunity, NZBc4 was unexpectedly found to contain a suppressor locus; disease suppression was mediated by a shift away from pathogenic immunoglobulin isotypes and associated with changes in the NKT and B1a cell compartments. In contrast to the NZBc4 locus, the NZBc13 locus is sufficient to initiate polyclonal B cell activation, ANA production and mild GN, similar to NZB mice. A B cell intrinsic defect was found to be responsible for initiating the abnormal cellular phenotype in B6.NZBc13 mice. Functional analyses of the B cell subset in B6.NZBc13 mice revealed normal BCR-signaling responses and tolerance mechanisms; however, they were hyper-responsive to TLR3 stimulation, resulting in increased survival and proliferation. Thus, the study of these NZB congenic mouse strains has been instrumental in confirming the presence of loci on NZB chromosomes 4 and 13 that modulate the development of disease and highlights that disease onset is mediated by a balance of both susceptibility and suppressor alleles. Collectively, these findings contribute to the current field of lupus immunogenetics and confirm the power of congenic mouse models in understanding the genetic basis of SLE.

Systemic lupus erythematosus (SLE) is an autoimmune disorder that is characterized by the production of antibodies directed against self-antigens, such as nuclear components. Genetic analyses of lupus patients have consistently demonstrated a complex genetic basis for disease susceptibility that involves multiple genes. Identifying genes and pathways that promote disease genesis has been aided by murine studies. In particular, congenic mouse studies that examine the role of chromosomal intervals from inbred lupus-prone mouse strains on a non-autoimmune background have been useful in dissecting the genetic contribution of novel susceptibility loci in lupus pathogenesis. In this thesis, the role of New Zealand Black (NZB) chromosomes 4 and 13 are examined in non-lupus prone C57BL/6 (B6) congenic mouse strains, denoted B6.NZBc4 and B6.NZBc13, respectively. Although repeatedly mapped to contain disease augmenting alleles,NZBc4 alone was not sufficient to initiate disease, despite an expansion of NKT and B1a cells–both with controversial pathogenic roles in lupus. Instead, by crossing the B6.NZBc4 mouse with another congenic mouse strain that develops fatal lupus autoimmunity, NZBc4 was unexpectedly found to contain a suppressor locus; disease suppression was mediated by a shift away from pathogenic immunoglobulin isotypes and associated with changes in the NKT and B1a cell compartments. In contrast to the NZBc4 locus, the NZBc13 locus is sufficient to initiate polyclonal B cell activation, ANA production and mild GN, similar to NZB mice. A B cell intrinsic defect was found to be responsible for initiating the abnormal cellular phenotype in B6.NZBc13 mice. Functional analyses of the B cell subset in B6.NZBc13 mice revealed normal BCR-signaling responses and tolerance mechanisms; however, they were hyper-responsive to TLR3 stimulation, resulting in increased survival and proliferation. Thus, the study of these NZB congenic mouse strains has been instrumental in confirming the presence of loci on NZB chromosomes 4 and 13 that modulate the development of disease and highlights that disease onset is mediated by a balance of both susceptibility and suppressor alleles. Collectively, these findings contribute to the current field of lupus immunogenetics and confirm the power of congenic mouse models in understanding the genetic basis of SLE.

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Rift Valley Fever Virus is a plebovirus that causes epidemics and epizootics in sub-Saharan African countries but has expanded to Egypt and the Arabian Peninsula. The laboratory rat (Rattus norvegicus) is susceptible to RVFV and has been shown to manifest the characteristic responses of humans and livestock. The rat has frequently been used as a model to study RVFV pathogenesis. Several strains have been infected and some found to be resistant to hepatic disease while others were not. This resistance was found to be associated with a dominant gene inherited in Mendelian fashion. The congenic rat strain WF.LEW and several substrains of the parental strains were used to try and locate the resistance gene. Microsatellites and single nucleotide polymorphisms were used to characterize the genomes of various rat substrains in an attempt to map the gene. Breeding and viral challenge experiments were used to further characterize the strains and assign a location to the resistance gene. The LEW/SsNHsd rats showed approximately 37% genomic difference as compared with LEW/MolTac rats, and 8% difference as compared with LEW/Crl rats. WF/NHsd rats demonstrated a difference of approximately 8% as compared with WF/CrCrl rats. Genotyping of the congenic WF.LEW revealed Lewis markers on RNO3 and RNO9. Subsequent backcross experiments and viral challenge experiments assigned the resistance gene to the distal end of RNO3.

To study hybrid sterility our laboratory uses mouse strains PWD/Ph (PWD), derived from Mus musculus musculus wild mice and the common laboratory strain C57BL/6J (B6) mostly of Mus musculus domesticus origin as a model. Crossing between PWD female and B6 male results in sterile male progeny. F1 hybrid males carry defects in the repair mechanisms of asymmetric double-strand DNA breaks (DSBs). Functional interplay of SPO11 and PRDM9 proteins in the meiotic prophase I is necessary for repairs. Its defect leads to incorrect synapse formation between homologous chromosomes, leading to halt in spermatogenesis and thus male sterility. The formation of DSBs and their subsequent repair is essential for first meiotic division. The working hypothesis stems from the findings in yeast model, where supposed antirecombinatorial mechanism of mismatch repair genes Msh6 and Msh2 prevents DSBs repairs during meiosis. Despite the functional mechanism of these two genes is not explicitly known, existence of similar repair system in mice is presumed. Variety of methods was implemented in this thesis. The effects of Msh6 deletion on meiotic prophase I and sperm maturation were performed by designing guide RNAs for CRISPR/Cas9 for creation of three knock-outs in B6 mice. The PCR was used to amplify regions adjacent to the...

京都大学 / 0048 / 新制・論文博士 / 博士(工学) / 乙第13016号 / 論工博第4141号 / 新制||工||1650(附属図書館) / 32944 / (主査)教授 跡見 晴幸, 教授 森 泰生, 教授 梅田 眞郷 / 学位規則第4条第2項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM

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Objetivos: Investigar anomalias dentárias, presença de fissura de lábio e/ou palato e higiene bucal em indivíduos com síndrome de Kabuki (SK) e listar as alterações sistêmicas presentes. Metodologia: Grupo 1: 46 prontuários de indivíduos com SK matriculados no HRAC/USP analisados quanto a presença de fissura de lábio e/ou palato e listadas as alterações sistêmicas presentes (cardiopatias, doenças infecciosas e imunológicas, nefropatias, comprometimento neurológicos e repercussões, aspectos genéticos). Grupo 2: formado por 15 indivíduos com SK matriculados no HRAC/USP submetidos aos exames clínicos para a investigação das alterações bucais (anomalias dentárias, presença de fissura de lábio e/ou palato e avaliação da higiene bucal índice de placa) e doenças sistêmicas existentes. Resultados: Grupo 1 43 (93,47%) indivíduos apresentaram fissura de lábio e/ou palato, 36 apresentaram fissura de palato; 17 (36,95%) indivíduos apresentaram cardiopatia congênita, 36 (76,59%) indivíduos tiveram doenças infecciosas ou imunológicas, 8 (17,39%) indivíduos apresentaram nefropatias, 40 (86,95%) indivíduos tinham deficiência intelectual e 1 (2,77%) indivíduos apresentou cariótipo com alteração. Grupo 2 todos os indivíduos com SK apresentaram fissura de lábio e/ou palato, 11 (73,33%) indivíduos apresentaram anomalias dentárias, todos os indivíduos apresentaram comprometimento da higiene bucal, 5 (33,33%) indivíduos apresentaram cardiopatias congênitas, 12 (80%) tiveram doenças infecciosas ou imunológicas, em um indivíduo foi notada nefropatia, 14 (93,33%) indivíduos demonstraram deficiência intelectual e 1 (6,66%) apresentou cariótipo alterado. Conclusões: Os indivíduos com SK apresentaram anomalias dentárias, fissura de lábio e/ou palato, higiene bucal comprometida, cardiopatias congênitas, doenças infecciosas e deficiência intelectual. / Aim: To investigate dental anomalies, presence of lip and/or cleft palate and dental hygiene in individuals with Kabuki Syndrome (KS) as well as detail their systemic alterations. Methodology: GROUP 1: 46 prontuaries of individuals with KS (patients from HRAC/USP) were analyzed concerning to the presence of lip and cleft palate and their systemic alterations were described (cardiopathies, infectious and immunological diseases, nephropathies, neurological disorders and genetical aspects). GROUP 2: 15 individuals with KS (patients from HRAC/USP) submitted to the clinical examination to investigate buccal alterations (dental anomalies, presence of lip and/or cleft palate and dental hygiene - plaque index) and systemic alterations. Results: Group 1 - 43 (93.47%) individuals showed lip and/or cleft palate, 36 showed cleft palate; 17 (36.95%) individuals showed congenic cardiopathies, 36 (36.95%) individuals showed infectious or immunological diseases, 8 (17.39%) individuals showed nephropathies, 40 (86.95%) individuals had intellectual disability and 1 (2.77%) individuals showed cariotip with alteration. Group 2 - all the individuals with KS showed lip and/or cleft palate, 11 (73.33%) individuals showed dental anomalies, all the individuals showed compromised dental hygiene, 5 (33.33%) individuals showed congenic cardiopathies, 12 (80%) showed infectious or immunological diseases, in only 1 individual nephropathy was observed, 14 (93.33%) had intellectual disabilities and 1 (6.66%) showed a cariotip with alteration. Conclusions: Individuals with KS showed dental anomalies, presence of lip and/or cleft palate, compromised buccal hygiene, congenic cardiopathies, infectious diseases and intellectual disability.

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