title: Molecular analysis of repetitive DNA elements from Entamoeba histolytica, which encode small RNAs and contain matrix/scaffold attachment recognition sequences.
abstract: We have isolated two DNA elements-Eh MRS1 and Eh MRS2-from Entamoeba histolytica, which contain the eukaryotic consensus Scaffold/Matrix Attachment Region (S/MAR) bipartite recognition sequences. Both these sequences bind to high salt extractable nuclear proteins and insoluble nuclear matrix proteins in E. histolytica HM1:IMSS, suggesting that the predicted S/MAR recognition sequences may indeed function as scaffold attachment regions in E. histolytica. Sequence analysis shows that Eh MRS1 and Eh MRS2 contain internal tandem repeats ranging from units of 8-11bp and are themselves present as independent arrays of tandemly repeating units of approximately 1100bp each. Eh MRS1 and Eh MRS2 are localised on different chromosomes in E. histolytica HM1:IMSS. Both Eh MRS1 and Eh MRS2 also code for small molecular weight RNAs of unknown function. Thus, two unique sequences-Eh MRS1 and Eh MRS2-demonstrate very similar properties, suggesting that they belong to a superfamily of genomic elements, which may function as scaffold or matrix attachment sites in Entamoeba.
authors.affiliation: Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Calcutta 700054, India.
authors.forename: Sulagna
authors.initials: S
authors.lastname: Banerjee
authors.forename: Anuradha
authors.initials: A
authors.lastname: Lohia
mesh_terms: D000818:Animals; D001483:Base Sequence; D002875:Chromosomes / Q000235:genetics; D004748:Entamoeba histolytica / Q000166:cytology / Q000235:genetics* / Q000378:metabolism; D036961:Matrix Attachment Region Binding Proteins / Q000378:metabolism; D008957:Models, Genetic; D015530:Nuclear Matrix / Q000378:metabolism; D034521:Nuclear Matrix-Associated Proteins / Q000032:analysis / Q000235:genetics; D018510:RNA, Helminth / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D012342:RNA, Small Nuclear / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics*; D016415:Sequence Alignment
chemical_list: D036961:Matrix Attachment Region Binding Proteins; D034521:Nuclear Matrix-Associated Proteins; D018510:RNA, Helminth; D012342:RNA, Small Nuclear