Brent A. Lasker

Learn More
Heterokaryons from Mucor racemosus were produced from two auxotrophic strains of the fungus. Germlings were converted to spheroplasts by using commercial chitinase and purified Myxobacter AL-1 chitosanase. Spheroplasts from the auxotrophic strains were mixed and fused in solutions of polyethylene glycol and CaCl2. Under optimal conditions, prototrophic(More)
Candida parapsilosis, a pathogenic yeast, is composed of three newly designated genomic species that are physiologically and morphologically indistinguishable. Nosocomial infections caused by group I C. parapsilosis are often associated with the breakdown of infection control practices and the contamination of medical devices, solutions, and indwelling(More)
Fifty-five epidemiologically linked Aspergillus fumigatus isolates obtained from six nosocomial outbreaks of invasive aspergillosis were subtyped by sequencing the polymorphic region of the gene encoding a putative cell surface protein, Afu3g08990 (denoted as CSP). Comparative sequence analysis showed that genetic diversity was generated in the coding(More)
A 1059-bp Sau3A fragment, designated Candida albicans repetitive element 2 (CARE-2), was isolated from the genome of the pathogenic yeast, C. albicans. CARE-2 DNA was detected on several C. albicans chromosomes separated by transverse alternating-field electrophoresis. A high degree of interstrain variation in the pattern of hybridizing bands were observed(More)
Random amplified polymorphic DNA (RAPD) was used to better characterize the genotypic relatedness among medically important Candida species. By using short oligomer primers (10-mers) with arbitrarily chosen sequences in the polymerase chain reaction, distinctive and reproducible sets of polymerase chain reaction products were observed for isolates of C.(More)
We have developed an improved scheme for the classification of environmental and clinical isolates of Histoplasma capsulatum that is based on analysis of mitochondrial DNA (mtDNA) and ribosomal DNA (rDNA). Strains were initially divided into mtDNA groups according to restriction digests of whole-cell DNA and Southern hybridization with cloned mtDNA probes.(More)
Nosocomial Candida albicans infections have become a major cause of morbidity and mortality in neonates in neonatal intensive care units (NICUs). To determine the possible modes of acquisition of C. albicans in hospitalized neonates, we conducted a prospective study at Grady Memorial Hospital, Atlanta, Ga. Clinical samples for fungal surveillance cultures(More)
In the present investigation, 49 Aspergillus fumigatus isolates obtained from four nosocomial outbreaks were typed by Afut1 restriction fragment length polymorphism (RFLP) analysis and three PCR-based molecular typing methods: random amplified polymorphic DNA (RAPD) analysis, sequence-specific DNA primer (SSDP) analysis, and polymorphic microsatellite(More)
To evaluate procedures used for epidemiologic analysis of outbreaks of aspergillosis, we analyzed a collection of 35 Aspergillus fumigatus isolates using three typing methods: isoenzyme analysis (IEA), random amplified polymorphic DNA (RAPD) analysis, and restriction endonuclease analysis (REA). Twenty-one isolates were from a single hospital, with four(More)
Nocardia farcinica is the most clinically significant species within the Nocardia asteroides complex. Differentiation of N. farcinica from other members of N. asteroides complex is important because this species characteristically demonstrates resistance to several extended-spectrum antimicrobial agents. Traditional phenotypic characterization of this(More)