Experiments are proposed to: 1) isolate the putative testis determining locus on Yp; 2) understand the mechanism underlying aberrant X/Y interchange, a frequent cause of XX sex reversal; and 3) study whether there is a """"""""spermatogenesis"""""""" locus on Yq. 1) Testis determining gene(s) will be isolated by criteria of presence in most XX males and absence in some XY females, evolutionary conservation, and male and/or testis-specific expression. Starting from a deletion map of Yp, a physical map of the testis determining region will be constructed. Y chromosomal DNA sequences derived from large restriction fragments spanning this region will be tested for evolutionary conservation. Their expression will be studied both at the RNA and at the protein level. The gene structure will be analyzed and exons will be sequenced. The ultimate functional proof of candidate testis determining gene(s) will come from their capacity to cause sex reversal in XX transgenic mice. 2) X and Y chromosomal breakpoints will be analyzed in several XX males. This will lead to a further understanding of the underlying mechanism of aberrant X/Y interchange. 3) Using DNA from fertile males with deletions of Yq, a deletion map will be constructed with respect to a putative """"""""spermatogenesis locus"""""""". A physical map will allow further delineation of this locus. Expression studies will be performed at the RNA level with evolutionary conserved sequences from this region. The tissue distribution of expressed RNA's will be investigated by in situ hybridization.

Project Start
1988-06-01
Project End
1991-05-31
Budget Start
1989-06-01
Budget End
1990-05-31
Support Year
2
Fiscal Year
1989
Total Cost
Indirect Cost
Name
Children's Hospital Boston
Department
Type
DUNS #
076593722
City
Boston
State
MA
Country
United States
Zip Code
02115
Muller, U; Wachtel, S S; Jaswaney, V L et al. (1993) H-Y (SDM) antibody specifically binds Mullerian inhibiting substance. Hum Genet 91:515-8
Guttenbach, M; Muller, U; Schmid, M (1992) A human moderately repeated Y-specific DNA sequence is evolutionarily conserved in the Y chromosome of the great apes. Genomics 13:363-7
Cheng, S D; Gasparini, R; Muller, U (1992) Molecular analysis of aberrations of Xp and Yq. Hum Genet 88:379-82
Muller, U; Kirkels, V G; Scheres, J M (1992) Absence of Turner stigmata in a 46,XYp-female. Hum Genet 90:239-42
Donlon, T A; Muller, U (1991) Deletion mapping of DNA segments from the Y chromosome long arm and their analysis in an XX male. Genomics 10:51-6
Monaco, A P; Muller, U; Larin, Z et al. (1991) Isolation of the human sex determining region from a Y-enriched yeast artificial chromosome library. Genomics 11:1049-53
Kupke, K G; Soreng, A L; Muller, U (1991) Origin of the supernumerary X chromosome in a patient with fragile X and Klinefelter syndrome. Am J Med Genet 38:440-4
Muller, U; Schneider, N R; Marks, J F et al. (1990) Maternal meiosis II nondisjunction in a case of 47,XXY testicular feminization. Hum Genet 84:289-92
Muller, U; Lalande, M (1990) A physical map of the human Y-chromosome short arm. Genomics 7:517-23
Guttenbach, M; Muller, U; Schmid, M (1990) Cytogenetic and molecular analysis of a Yq isochromosome. Hum Genet 86:147-50

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