Follicle-stimulating hormone beta gene structure in premature ovarian failure.

OBJECTIVE: To determine whether mutations in the gene for FSH beta are present, and possibly etiologic, in some patients with 46,XX premature ovarian failure (POF). DESIGN: DNA samples obtained from 18 study patients with POF and two menopausal fertile controls were studied by Southern blot analysis. DNA sequencing was performed in one patient. SETTING: Patients were seen in a reproductive endocrinology clinic and studied in a medical school laboratory setting at the Medical College of Georgia and Tufts University. MAIN OUTCOME MEASURES: Restriction fragment sizes on autoradiographs were compared between the study group and controls. DNA sequencing radiographs were compared between one study patient and five controls. RESULTS: Fragment sizes obtained with the restriction enzymes EcoRI, DraI, HincII, PstI, KpnI, BglI, BamHI, and BglII were similar size in both study subjects and controls using the probes pFSH beta-1.4 and pFSH beta-1.2. A previously described HindIII polymorphism was present using pFSH beta-1.2, but HindIII fragment sizes were identical in patients with ovarian failure and controls using pFSH beta-1.4. DNA sequencing of the FSH beta gene in one patient was normal. CONCLUSIONS: No mutations in the gene for FSH beta were identified in women with POF. DNA sequencing of the exons and promoter region of the FSH beta gene in one woman with POF was normal. This does not entirely exclude the possibility that smaller deletions, insertions, or point mutations of the FSH beta could be etiologic in some women with POF. The HindIII polymorphism does not appear to segregate with 46,XX POF.

Gonadotropin-releasing hormone, follicle-stimulating hormone beta, luteinizing hormone beta gene structure in idiopathic hypogonadotropic hypogonadism.

OBJECTIVE: To determine if the genes for gonadotropin-releasing hormone (GnRH), follicle-stimulating hormone beta (FSH beta), and luteinizing hormone beta (LH beta) are present, and if so, whether gene structure is normal in patients with idiopathic hypogonadotropic hypogonadism (IHH). DESIGN: Patients with clinical and laboratory characteristics of IHH were studied at the deoxyribonucleic acid (DNA) level to assess gene structure. SETTING: This study took place in an academic setting. PATIENTS: Human volunteers with documented IHH and fertile controls were studied. INTERVENTIONS: Genomic DNAs were extracted from each patient, Southern blots were constructed and hybridized to DNA probes for GnRH, FSH beta, and LH beta. DNA samples were also subjected to polymerase chain reaction analysis. MAIN OUTCOME MEASURES: Gene structure was assessed by analysis of autoradiographs and gel electrophoresis of polymerase chain reaction products in both the study patients and controls. RESULTS: Each analysis for FSH beta, LH beta, and GnRH demonstrated the same sized fragments in both the study group and control group. A 1.2-kilobase fragment containing the coding region for GnRH was present in all patients with IHH and controls by polymerase chain reaction. CONCLUSIONS: The genes for GnRH, LH beta, and FSH beta are present in patients with IHH. No large deletions or rearrangements of any of these genes were identified in any of these patients.

Unusual strain of Borrelia burgdorferi isolated from Ixodes dentatus in central Georgia.

A new, unusual spirochete was cultured in Barbour-Stoenner-Kelly (BSK II) medium from the midgut and other tissues of the tick Ixodes dentatus. The tick was collected from leaf litter in an oak-pine wood lot in Bibb County approximately 7.2 km from Macon in central Georgia during February 1993. Characterization by indirect immunofluorescence using 5 murine monoclonal antibodies, by sodium dodecyl sulfate-polyacrylamide gel electrophoresis of whole spirochetal lysates, and by polymerase chain reaction assay for several known DNA target sequences indicates that the spirochete is Borrelia burgdorferi sensu lato. It is genetically different from the B-31 reference strain of B. burgdorferi sensu stricto that is typical of strains causing Lyme borreliosis in North America. Range of infectivity and pathogenesis of the Bibb County isolate (BC-1) are unknown but being investigated. The BC-1 strain is the first B. burgdorferi isolate from I. dentatus in the southeastern United States (I. dentatus is not the common vector for Lyme borreliosis in humans). Additionally, the collection site was approximately 322 km from the Atlantic coast, far distant from where most B. burgdorferi isolates have been obtained.

Natural occurrence and characterization of the Lyme disease spirochete, Borrelia burgdorferi, in cotton rats (Sigmodon hispidus) from Georgia and Florida.

This is the first report of natural infection by Borrelia burgdorferi in the cotton rat Sigmodon hispidus. Nine B. burgdorferi isolates were obtained from ear tissues, urinary bladders, or both, by culturing tissues in BSKII medium. The rat from which the SI-3 isolate was cultured was from the same site (Sapelo Island, Georgia) as an infected cotton mouse Peromyscus gossypinus and Ixodes scapularis tick reported previously. The 8 B. burgdorferi isolates from rats in Florida included 1 (AI-1) from Amelia Island, 1 (FD-1) from Faver-Dykes State Park, and 6 (MI-3 through MI-8) from Merritt Island. The distance between Sapelo Island and Merritt Island is approximately 400 km. All B. burgdorferi isolates were characterized by indirect immunofluorescence using monoclonal antibodies to OspA (H3TS, H5332) and OspB (H5TS, H6831), polymerase chain reaction detection of specific B. burgdorferi B-31 DNA target sequences (ospA, fla, and a random chromosomal sequence), and sodium dodecyl sulfate-polyacrylamide gel electrophoresis of spirochetal proteins. The phenotypic and genotypic characteristics of the isolates are discussed, as well as the probable importance of the cotton rat as a reservoir for B. burgdorferi in the southern United States.

Molecular detection of JC virus in embalmed, formalin-fixed, paraffin-embedded brain tissue.

Embalmed tissues are adequate for the detection of JC virus in lesions of progressive multifocal leukoencephalopathy (PML) by immunohistologic and molecular methods. JC virus was readily detected in embalmed brain tissue using immunohistochemistry (IHC), in situ hybridization (ISH), and the polymerase chain reaction (PCR). Two brains were removed from bodies that had been embalmed at least 24 h prior to autopsy. They were subsequently post fixed in 10% buffered formalin for 10-14 days before dissection and molecular studies were performed. Though these techniques are not novel, their use in embalmed tissues is. Routine embalming should not eliminate these diagnostic procedures from consideration.

Detection of Borrelia burgdorferi in human blood and urine using the polymerase chain reaction.

We investigated the use of the polymerase chain reaction (PCR) to detect Borrelia burgdorferi strain B-31 in human blood and urine experimentally inoculated with 5 and 1 borreliae/cm3, respectively, and to biotinylate a DNA probe specific for B. burgdorferi in the dot blot and Southern blot assays. When the blood and urine samples were subjected to PCR, a 370-bp amplified product was consistently visible on agarose gel electrophoresis after 30 and 45 cycles, respectively. The total human genomic DNA extracted from a 1-cm3 sample of inoculated blood was approximately 6.25 micrograms, and the total amount of B. burgdorferi DNA was estimated to be 0.01 pg/6.25 micrograms of the human DNA. For PCR, 2.5 micrograms of human DNA which contained the equivalent of 0.004 pg of borrelia DNA (approximately two borreliae) were used for enzymatic amplification. When 1/20 or 1/10 of the PCR-amplified products were used either for dot blot or Southern blot hybridization, the accessible copies of amplified B. burgdorferi DNA were sufficient for detectable hybridization to occur. PCR amplification of B. burgdorferi DNA in clinical specimens followed by dot blot hybridization may be a valuable adjunct or alternative to current but inadequate laboratory methods for the diagnosis of Lyme disease.

First isolation and cultivation of Borrelia burgdorferi sensu lato from Missouri.

Five Borrelia burgdorferi sensu lato isolates from Missouri are described. This represents the first report and characterization of such isolates from that state. The isolates were obtained from either Ixodes dentatus or Amblyomma americanum ticks that had been feeding on cottontail rabbits (Sylvilagus floridanus) from a farm in Bollinger County, Mo., where a human case of Lyme disease had been reported. All isolates were screened immunologically by indirect immunofluorescence by using monoclonal antibodies to B. burgdorferi-specific outer surface protein A (OspA) (antibodies H3TS and H5332), B. burgdorferi-specific OspB (antibody H6831), Borrelia (genus)-specific antiflagellin (antibody H9724), and Borrelia hermsii-specific antibody (antibody H9826). Analysis of the isolates also involved a comparison of their protein profiles by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Finally, the isolates were analyzed by PCR with six pairs of primers known to amplify selected DNA target sequences specifically found in the reference strain B. burgdorferi B-31. Although some genetic variability was detected among the five isolates as well as between them and the B-31 strain, enough similarities were found to classify them as B. burgdorferi sensu lato.

Isolation, cultivation, and characterization of Borrelia burgdorferi from rodents and ticks in the Charleston area of South Carolina.

Twenty-eight Borrelia burgdorferi isolates from the Charleston, S.C., area are described. This represents the first report and characterization of the Lyme disease spirochete from that state. The isolates were obtained from December 1994 through December 1995 from the tick Ixodes scapularis, collected from vegetation, and from the rodents Peromyscus gossypinus (cotton mouse), Neotoma floridana (eastern wood rat), and Sigmodon hispidus (cotton rat). All isolates were screened immunologically by indirect immunofluorescence with monoclonal antibodies to B. burgdorferi-specific outer surface protein A (OspA) (antibodies H5332 and H3TS) and B. burgdorferi-specific OspB (antibodies H6831 and H614), a Borrelia (genus)-specific antiflagellin antibody (H9724), Borrelia hermsii-specific antibodies (H9826 and H4825), and two polyclonal antibodies (one to Borrelia species and another to B. burgdorferi). Six of the isolates were analyzed by exposing Western blots to monoclonal antibodies H5332, H3TS, H6831, and H9724. All isolates were also analyzed by PCR with five pairs of primers known to amplify selected DNA target sequences specifically reported to be present in the reference strain, B. burgdorferi B-31. The protein profiles of six of the isolates (two from ticks, one from a cotton mouse, two from wood rats, and one from a cotton rat) also were compared by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. We conclude that the 28 Charleston isolates are B. burgdorferi sensu stricto based on their similarities to the B. burgdorferi B-31 reference strain.