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UMI MOLECULAR GENETIC AND BIOCHEMICAL STUDIES OF THE HUMAN AND MOUSE MHC COMPLEMENT GENE CLUSTERS DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Zhenyu Yang, M.S. ***** The Ohio State Univeristy 1999 Dissertation Committee: Approved by Chack Yung Yu, D.Phil., Adviser % - Adviser George A. Marzluf, Ph.D. Molecular, Cellular and Gail D. Wenger, Ph.D. Developmental Biology Program Arthur H. M. Burghes, Ph.D. UMI Number: 9931705 UMI Microform 9931705 Copyright 1999, by UMI Company. All rights reserved. This microform edition is protected against unauthorized copying under Title 17, United States Code. UMI 300 North Zeeb Road Ann Arbor, MI 48103 Copyright by Zhenyu Yang 1999 ABSTRACT The major histocompatibility complex (MHC) is associated with more than 70 diseases. The goals of this study are to investigate the mechanisms of diseases associated with the MHC class HI region. As shown by definitive restriction fragment length polymorphisms, the four tandemly arranged genes serine/threonine kinase RP, complement component C4, steroid 21-hydroylase CYP21, and tenascin TNX are organized as a genetic unit designated as the RCCX module. Variations in the number and size of the RCCX modules can promote unequal crossover, leading to gene duplications and deletions. A TNXB-XA recombinant resulted from an unequal crossover between a monomodular and a bimodular RCCX was observed in a patient with congenital adrenal hyperplasia. Elucidation of the DNA sequence for the recombination breakpoint region enabled the designation of a diagnostic technique to detect the presence of TNXB-XA hybrids concurrent with deletions of CYP21B and C4B. Since the major genetic factor(s) for insulin dependent diabetes mellitus (IDDM) reside in the MHC, EDDM patients were investigated for specific patterns of the RCCX modular structures. The frequency of monomodular RCCX structures is found significantly higher in the diabetic population than in the normal. A novel gene, DOM3Z, was discovered in the intergenic region between SKI2W and RPl. The cDNA sequence and the exon-intron structure of D0M 3Z were determined. Immunochemical and transient expression experiments revealed that human Dom3z is a nuclear protein. Z)OMiZ-related genes are present in simple and complex eukaryotes. Located between the complement factor B and C4 genes are the four ubiquitously expressed genes, RD-SKI2W-DOM3Z-RP1. These four genes are configured as two head-to-head orientated gene pairs. The presence of unmethylated CpG sequences at the 5' regulatory regions of each gene pair indicates that they may be housekeeping genes. RD, Ski2w, DomSz, and RP probably have concerted functions related to RNA transcription, translation and turnover. The organization of the mouse MHC complement gene cluster (MCGC) is similar to that of human's. However, the duplication of mouse RCCX modules is markedly different from human as the mouse gene fragments RP2 and TNXA are larger and less conserved, suggesting an independent gene duplication event during evolution. Ill Dedicated to My Parents IV ACKNOWLEGMENTS First and foremost, I am grateful to my adviser. Dr. Chack Yung Yu, for all his understanding and support during my graudate studies; for his patience in correcting my scientific errors; and for his encouragement and enthusiasm, which made my research and eventually, this thesis, possible. I want to thank Dr. George A. Marzluf, a real gentleman, for the chance he provided for me to do my first rotation (during which I ran the very first sequencing gel in my life); for sparing time and offering encouragement; and for being there whenever I need help. I want to express my appreciation to Dr. Gail D. Wenger, for teaching me the FISH technique, the result of which inspired me to discover my gene DOM3Z\ and for bringing the toothbrush back from Baltimore for a "night person"©. Thank-you also goes to Dr. Arthur H. M. Burghes, for showing me how to search the databases. I wish to thank Dr. M. Sue O'Dorisio for being my cheerleader, offering the support and encouragement I needed. It is still fresh in my memory that despite of her busy schedule, she c aie fully reviewed my first first-author paper. I want to thank Dr. William B. Zipf and the nurses in the Department of Endocrinology at Columbus Children's Hospital for recruiting IDDM and CAR patients, which makes the genetic analysis possible. I also appreciate all the patients who volunteered for the study. They are the real heroes whose belief in science will eventually benefit millions of other patients. A special thank-you goes to Professor Manfred P. Dierich at University Innsbruck, Austria. His personal acknowledgment has enabled me to be more confident in myself. His graciousness has set a perfect example for me to be a decent person. I also wish to thank Dr. Joann Moulds from The University of Texas at Houston, not only for her help in setting up C4 allotyping experiments, but also for offering support and being a friend. I want to thank Jan Zinaich, manager of MCDB Program, for keeping me informed of all opportunities, and for ensuring me happiness is the most important part of life (This is more than an appreciation between Gemini's). I am grateful to members of Dr. Yu's laboratory: Brad Baker, Andrew Dan gel, Anna Mendoza, Xiaodong Qu, Kristi Rupert (my English teacher), Shanxiang Zhang, and Bi Zhou. They are the people who have watched me through the ups and downs, shared my happiness and pain. They are the ones who helped me in dealing with various problems. I also thank Monica Summers and Doug Balster for sharing cell lines, and for being friends. Thank you to all my friends, for their love, which holds me through hard times. VI Finally, I thank the Presidential Fellowship from The Ohio State University for the financial support. VITA June 2, 1971 ......................................... Bom - P.R.China 1992 ..................................................... B.S., Biology, Beijing Normal University 1992-1994............................................ Research Associate, Institute of Genetics, Chinese Academy of Sciences, Beijing, P.R.China 1994-1998 ............................................Graduate Teaching and Research Associate, The Ohio State University 1998 ...................................................... M.S., Molecular, Cellular and Developmental Biology The Ohio State University 1998-present .........................................Presidential Research Fellow, The Ohio State University VIII PUBLICATIONS Original Research Articles 1. Qu, X. ,Yang.Z„ Zhang,S., Shen, L., Dangel,A.W., Hughes, J., Redman, K.L., Wu, L.-C. and Yu, C.Y. (1998) The human DEVH-box protein Ski2w from the HLA is localized in nucleoli and ribosomes. Nucleic Acids Res. 26: 4068-4077. 2. Yang Z., Shen L., Wu L.C., Dangel A.W., and Yu C.Y. (1998) Four ubiquitously expressed genes, RD-SKI2W-DOM3Z-RP1, are present between complement component genes factor B and C4 in the class EH region of the HLA. Genomics 53: 338-347. 3. Yang, Z„ Mendoza, A.R., Welch, T.R., Zipf W.B., and Yu, C.Y. (1999) Modular variations of the human MHC class EH genes for serine/threonine kinase RP, complement component C4, steroid 21-hydroxylase CYP21 and tenascin TNX (RCCX): a mechanism for gene deletions and disease associations. J. Biol. Chem. 274: 12147-12156. 4. Yang. Z. and Yu, C.Y. (1999) Organizations and gene duplications of the human and mouse MHC complement gene clusters. Exp. Clin. Immunogenet. (in press). Peer-Reviewed Abstracts 1. Yang. Z., Wenger, G., Labanowska, J., Mendoza, A., and Yu, C.Y. (1996) The putative human helicase gene KIAA0052 that is evolutionally related to the yeast antiviral gene SKI2 and to the human HLA class EH gene SKI2W maps to chromosome 9qter and chromosome 5ql 1.2. Am. J. Hum. Genet. 59: A408. 2. Yang. Z.. Wenger, G., and Yu, C.Y. (1997) Ski2k, a putative RNA helicase involved in RNA transport, is conserved from yeast to human. Am. J. Hum. Genet. 61: A 186. 3. Yang. Z.. Mendoza, A.R., Welch, T.R., Zipf W.B., and Yu, C.Y. (1999) Frequent and concurrent duplication and deletion of four consecutive genes in the human MHC class EH region: a mechanism for disease associations. FASEB J. 13: A1472. IX Electronic publications 1.