title: Cytomegalovirus (CMV) strain differences between the eye and blood in AIDS patients with CMV retinitis.
abstract: OBJECTIVE
  To investigate possible differences in cytomegalovirus (CMV) strain distribution between the eye and blood in AIDS patients with CMV retinitis.
  
  
  METHODS
  CMV DNA sequences from aqueous humour and peripheral blood leukocytes (PBL), obtained from 13 AIDS patients with CMV retinitis, were compared. DNA was isolated and the CMV IE-1 sequence (part of the immediate early-1 gene) and the a-sequence (located in the a-region) were amplified by polymerase chain reaction (PCR). The PCR products of the a-sequence were analysed by Southern blotting for amplified fragment-length polymorphisms. The level of divergence between the a-sequences of aqueous humour- and PBL-derived CMV was studied in two patients by cloning these sequences followed by sequence analysis.
  
  
  RESULTS
  CMV DNA could be detected in all aqueous humour samples and in 10 out of 13 paired blood samples. In the 10 patients, with CMV DNA detectable in both aqueous humour and PBL, seven cases showed differences between the amplified products of both compartments. Sequence analysis in two patients revealed that the aqueous humour and PBL of the same patient can harbour both identical, similar and highly divergent CMV a-sequences.
  
  
  CONCLUSIONS
  These results indicate that despite the haematogenous spread of CMV, the eye, being a relatively shielded organ, may contain CMV strains different from those found in the blood.
authors.affiliation: Department of Ophthalmology, Academic Medical Centre, University of Amsterdam, The Netherlands.
authors.forename: F D
authors.initials: FD
authors.lastname: Verbraak
authors.forename: M
authors.initials: M
authors.lastname: Bruinenberg
authors.forename: G J
authors.initials: GJ
authors.lastname: van den Horn
authors.forename: C
authors.initials: C
authors.lastname: Meenken
authors.forename: A
authors.initials: A
authors.lastname: van der Lelij
authors.forename: C B
authors.initials: CB
authors.lastname: Hoyng
authors.forename: A
authors.initials: A
authors.lastname: Kijlstra
authors.forename: R
authors.initials: R
authors.lastname: Peek
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000097:blood / Q000821:virology*; D000328:Adult; D001483:Base Sequence; D003587:Cytomegalovirus / Q000235:genetics* / Q000302:isolation & purification; D017726:Cytomegalovirus Retinitis / Q000097:blood / Q000821:virology*; D004279:DNA, Viral; D005123:Eye / Q000473:pathology / Q000821:virology*; D006801:Humans; D017874:Immediate-Early Proteins / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D012689:Sequence Homology, Nucleic Acid; D014764:Viral Proteins
chemical_list: D004279:DNA, Viral; C088645:IE1 protein, cytomegalovirus; D017874:Immediate-Early Proteins; D014764:Viral Proteins