Paul M. Bingham

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We have shown previously that four of five white mutant alleles arising in P-M dysgenic hybrids result from the insertion of strongly homologous DNA sequence elements. We have named these P elements. We report that P elements are present in 30-50 copies per haploid genome in all P strains examined and apparently are missing entirely from all M strains(More)
Two unrelated pre-mRNA splicing regulators-suppressor-of-white-apricot (su(wa)) and transformer (tra)-contain distinctive, approximately 120 amino acid arginine/serine (RS)-rich domains. Deletion of the su(wa) RS domain eliminates function. Replacement with the tra RS domain restores su(wa) function to nearly wild-type levels. Replacement with a 10 amino(More)
We describe the isolation of a cloned DNA segment carrying unique sequences from the white locus of Drosophila melanogaster. Sequences within the cloned segment are shown to hybridize in situ to the white locus region on the polytene chromosomes of both wild-type strains and strains carrying chromosomal rearrangements whose breakpoints bracket the white(More)
The molecular nature of mutations arising in dysgenic hybrids between P and M Drosophila melanogaster strains has been investigated. Seven independent mutations at the white locus were examined, and these fell into two classes on the basis of their genetic and structural properties. The five mutations comprising the first class were caused by DNA insertions(More)
We report results indicating that the temperature-sensitive white-blood (wbl) mutation has a novel molecular basis, involving the formation of RNA transcripts of the affected gene rather than the behavior of the polypeptide product. First, we show that the temperature-sensitive mutant phenotype of wbl correlates with (and presumably results from) a(More)
The white locus of Drosophila melanogaster is a genetically well-characterized locus, mutations in which alter the degree of pattern of pigmentation of the eyes. Using a previously cloned DNA segment containing a portion of the white locus of a mutant allele, we have cloned and characterized the DNA of a 48-kilobase chromosomal region of the Canton S(More)
Results are described demonstrating that several X chromosomes of Drosophila melanogaster carrying the Wa (white-apricot) mutant allele also carry homology to the copia transposable element in distal 3C of the polytene chromosome map as assessed by situ hybridization. The locus of the Wa mutation, white, resides in distal 3C. We further show, using fine(More)
We report the analysis of CPI-613, the first member of a large set of analogs of lipoic acid (lipoate) we have investigated as potential anticancer agents. CPI-613 strongly disrupts mitochondrial metabolism, with selectivity for tumor cells in culture. This mitochondrial disruption includes activation of the well-characterized, lipoate-responsive regulatory(More)
G-C leads to A-T transitions are induced by heat, and arise from the deamination of cytosine (5-hydroxymethylcytosine in the case of bacteriophage T4) generating uracil. The reaction is proton-catalyzed, and is also characteristic of acid mutagenesis. Mutation rates and activation energies of mutation are site-specific, and are presumably influenced by(More)
We report studies using an enhanced experimental system to investigate organization of nuclear pre-mRNA metabolism. It is based on the powerful genetic system and polytene nuclei of Drosophila. We observe (at steady state) movement of a specific pre-mRNA between its gene and the nuclear surface. This movement is isotropic, at rates consistent with diffusion(More)