Slides were analyzed using GDC-0068 price a Nikon Eclipse E800 microscope (Nikon USA, Melville, NY, USA) equipped with a digital camera Nikon DXM1200. Total RNA was isolated using TRIzol reagent (Invitrogen Life Technologies, CA, USA), following the manufacturer’s instructions. cDNA synthesis was performed in a final volume of 20 μL using ImProm-II Reverse Transcriptase (Promega Corporation, WI, USA). PCR amplification was performed with SYBR Green Master Mix (Applied

Biosystems, CA, USA) and analyzed with an ABI Prism 7500 sequence detector (Applied Biosystems), using the 2−ΔΔCT method [50]. The primers used for PCR amplification are listed in Table 1. Results are expressed as the mean ± SD of the indicated number of experiments. Statistical analysis of control and experimental groups was performed by Student’s t-test

using Prism 5 GraphPad (La Jolla, CA, USA) software. Differences were considered statistically significant when p ≤ 0.05. We thank Marcelo Dias Baruffi for helpful discussion, Julio Siqueira and Domingos Soares de Souza Filho for expert animal care, Vani MA Correa for excellent technical assistance, and João Santana da Silva for the CD103 antibody. This work was supported by grants from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional do Desenvolvimento Científico e Tecnológico (CNPq) to E.S.B. and M.C.R.B. and grants from Fundación Sales and Agencia Nacional de AZD0530 nmr Promoción Científica y Tecnológica (Argentina) to G.A.R. The authors declare no commercial conflict of interest. “
“Patients with adenosine deaminase (ADA) deficiency exhibit spontaneous and partial clinical remission associated with

somatic reversion of inherited mutations. We report a child with severe combined immunodeficiency (T-B- SCID) due to ADA deficiency diagnosed at the age of 1 month, whose lymphocyte counts including CD4+ and CD8+ T and NK cells began to improve after several months with normalization of ADA activity in Peripheral blood lymphocytes (PBL), as a result of somatic mosaicism caused by monoallelic reversion of the causative mutation in the ADA gene. He was not eligible for haematopoietic Fenbendazole stem cell transplantation (HSCT) or gene therapy (GT); therefore he was placed on enzyme replacement therapy (ERT) with bovine PEG-ADA. The follow-up of metabolic and immunologic responses to ERT included gradual improvement in ADA activity in erythrocytes and transient expansion of most lymphocyte subsets, followed by gradual stabilization of CD4+ and CD8+ T (with naïve phenotype) and NK cells, and sustained expansion of TCRγδ+ T cells. This was accompanied by the disappearance of the revertant T cells as shown by DNA sequencing from PBL.