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Forty-two potential NA resistance (NAr) mutation sites were screened within these 164 RT sequences. The NAr mutation prevalence and frequency in the NA-treated group were significantly higher than those in the NA-untreated one (P?[http://www.selleckchem.com/products/crenolanib-cp-868596.html Crenolanib manufacturer] putative NAr and pre-treatment mutations were observed at 22 sites (rtT38, rtN/S53, rtL82, rtL/I91, rtN/Y124, rtH126, rtT128, rtN/D134, rtN139, rtR153, rtV191, rtV207, rtS213, rtV214, rtE218, rtY/F221, rtV/I224, rtL229, rtI233, rtN/H238, rtR242, and rtS/C256) in both groups. Substitutions at seven non-classical mutation sites were of interest due [https://en.wikipedia.org/wiki/RecBCD RecBCD] to either detection only in patients with virologic breakthrough (rtL82 and rtV214), or potential ties with HBV genotypes (rtV191 and rtL229), or coexistence with rtM204I/V (rtL229), or increased mutation trends after NA-treatment (rtT128, rtV207, and rtN/H238). In conclusion, NA treatment not only constitutes a major selection factor for the primary and secondary/compensatory NAr mutations but also drives the changes of some of the putative NAr mutation sites, most of which are the genotype-independent RT sites (rtL82, rtT128, rtV191, rtV207, rtV214, rtL229, [http://www.selleckchem.com/screening/anti-diabetic-compound-library.html Anti-diabetic Compound Library] and rtN/H238). Their antiviral resistance potential calls for further investigations. J. Med. Virol. 84:207�C216, 2012. ? 2011 Wiley Periodicals, Inc. ""The prevalence of transmitted HIV drug resistance (TDR) in Los Angeles County remains unknown, due in part to the absence of reliable genotypic data. The specific objectives of this study are to estimate the prevalence of TDR, to describe the demographic characteristics associated with TDR and to investigate the distribution of HIV-1 subtypes among persons newly diagnosed with HIV in Los Angeles County. From 2007 through 2009, 1,414 sequences were obtained from 7,100 persons newly diagnosed with HIV through HIV resistance surveillance. Overall, 257 (18%) sequences had some genetic evidence of drug resistance. Of these, 122 (9%) exhibited evidence of resistance to non-nucleoside reverse transcriptase inhibitors, 121 (9%) to nucleoside reverse transcriptase inhibitors and 76 (5%) to protease inhibitors. Subtype B was dominant (97%), followed by subtypes C (1.2%), CRF01_AE (0.8%), CRF02_AG (0.4%), A (0.3%), and F (0.1%). With a TDR prevalence of 18%, Los Angeles County ranks high compared with other jurisdictions across the nation. The prevalence of TDR in recent (19%) and long-standing (17%) HIV cases were similar, thus providing additional support for the notion that TDR-associated mutations may persist well beyond the period of recent infection.