biostudies-literatureBacolla AIntramural NIH HHSNIEHS NIH HHSNCI NIH HHSNINDS NIH HHS2663-75https://www.ebi.ac.uk/biostudies/studies/S-EPMC1464109biostudies-literatureUnknown34(9)Homo(purine*pyrimidine) sequences (R*Y tracts) with mirror repeat symmetries form stable triplexes that block replication and transcription and promote genetic rearrangements. A systematic search was conducted to map the location of the longest R*Y tracts in the human genome in order to assess their potential function(s). The 814 R*Y tracts with > or =250 uninterrupted base pairs were preferentially clustered in the pseudoautosomal region of the sex chromosomes and located in the introns of 228 annotated genes whose protein products were associated with functions at the cell membrane. These genes were highly expressed in the brain and particularly in genes associated with susceptibility to mental disorders, such as schizophrenia. The set of 1957 genes harboring the 2886 R*Y tracts with > oNucleic acids researchLong homopurine*homopyrimidine sequences are characteristic of genes expressed in brain and the pseudoautosomal region.PMC1464109N01CO12400ES11347N01-CO-12400NS37554R01 ES011347Wells RDStefanov SOlsh ALempicki RAChuzhanova NCooper DNCollins JRGold BYi MStephens RMBacolla AJakupciak JPDean MfalseLong homopurine*homopyrimidine sequences are characteristic of genes expressed in brain and the pseudoautosomal region.Homo(purine*pyrimidine) sequences (R*Y tracts) with mirror repeat symmetries form stable triplexes that block replication and transcription and promote genetic rearrangements. A systematic search was conducted to map the location of the longest R*Y tracts in the human genome in order to assess their potential function(s). The 814 R*Y tracts with > or =250 uninterrupted base pairs were preferentially clustered in the pseudoautosomal region of the sex chromosomes and located in the introns of 228 annotated genes whose protein products were associated with functions at the cell membrane. These genes were highly expressed in the brain and particularly in genes associated with susceptibility to mental disorders, such as schizophrenia. The set of 1957 genes harboring the 2886 R*Y tracts with > o2006-01-01T00:00:00Z20062025-04-19T07:22:47.112Z2019-03-27T01:45:23ZS-EPMC14641091671444510.1093/nar/gkl354