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Journal of the Neurological Sciences 2007-Feb

Absence of Mycoplasma-specific DNA sequence in brain, blood and CSF of patients with multiple sclerosis (MS): a study by PCR and real-time PCR.

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Georgina Casserly
Thomas Barry
Wallace W Tourtellotte
Edward L Hogan

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Mycoplasmas are the smallest of the known self-replicating organisms. They lack cell walls and are associated with numerous diseases in humans and animals. We are exploring the possibility that infection by Mycoplasma may induce the inflammatory demyelinating disease of the central nervous system (CNS) that is MS. The presence of specific Mycoplasma species DNA was sought in brain, serum and cerebrospinal fluid (CSF) of patients diagnosed with multiple sclerosis (MS) and other neurological diseases (OND) including inflammatory disorders. The MS samples from patients with active and progressive MS, as well as in remission, a variety of other neurological disease controls, including inflammatory CNS diseases such as meningitis, cryptococcal meningitis and encephalitis and other neurological disorders such as migraine were also examined. Clinical samples were provided by the National Neurological Research Specimen Bank and the Human Brain and Spinal Fluid Resource Centre, Los Angeles. Analysis was carried out by conventional PCR using Mycoplasma-specific primers (McAuliffe et al., 2005) that target the 16S rDNA gene in Mycoplasma species. The Mycoplasma-specific primers could detect 102 Mycoplasma species. In this study, 30 samples of human brain and 57 pairs of serum and CSF and were examined. No Mycoplasma-specific nucleic acid sequence was detected, and the consistent observation of an endogenous gene, human serum albumin (HSA), as a positive control documented the adequacy of the method. Real-time PCR analysis of serum and CSF was done also targeting utilizing the Mycoplasma 16S rDNA gene, and this also demonstrated the lack of Mycoplasma in these samples. The presence of Mycoplasma at extraneural sites in MS patients is now being explored.

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