Analysis of COL7A1 pathogenic variants in a large cohort of dystrophic epidermolysis bullosa patients from Argentina reveals a new genotype-phenotype correlation.

Dystrophic epidermolysis bullosa (DEB) is a clinically heterogeneous heritable skin disorder, characterized by blistering of the skin and mucous membranes following minor trauma. Dominant (DDEB) and recessive (RDEB) forms are caused by pathogenic variants in COL7A1 gene. Argentina's population has a heterogeneous genetic background, and little is known about the molecular basis of DEB in our country or in native South American populations. In this study, we present the prevalence and geographical distribution of pathogenic variants found in 181 patients from 136 unrelated families (31 DDEB and 105 RDEB). We detected 95 different variants, 59 of them were previously reported in the literature and 36 were novel, nine of which were detected in more than one family. The most prevalent pathogenic variants were identified in exon 73 in DDEB patients and in exon 3 in RDEB patients. We also report a new phenotype-genotype correlation found in 10 unrelated families presenting mild blistering and severe mucosal involvement. Molecular studies in populations with an unexplored genetic background like ours revealed a diversity of pathogenic variants, and we hope that these findings will contribute to the definition of targets for new gene therapies.

HIF2α Upregulates the Migration Factor ODZ1 under Hypoxia in Glioblastoma Stem Cells.

Background: Glioblastoma (GBM) remains a major clinical challenge due to its invasive capacity, resistance to treatment, and recurrence. We have previously shown that ODZ1 contributes to glioblastoma invasion and that ODZ1 mRNA levels can be upregulated by epigenetic mechanisms in response to hypoxia. Herein, we have further studied the transcriptional regulation of ODZ1 in GBM stem cells (GSCs) under hypoxic conditions and analyzed whether HIF2α has any role in this regulation. Methods: We performed the experiments in three primary GSC cell lines established from tumor specimens. GSCs were cultured under hypoxia, treated with HIF regulators (DMOG, chetomin), or transfected with specific siRNAs, and the expression levels of ODZ1 and HIF2α were analyzed. In addition, the response of the ODZ1 promoter cloned into a luciferase reporter plasmid to the activation of HIF was also studied. Results: The upregulation of both mRNA and protein levels of HIF2α under hypoxia conditions correlated with the expression of ODZ1 mRNA. Moreover, the knockdown of HIF2α by siRNAs downregulated the expression of ODZ1. We found, in the ODZ1 promoter, a HIF consensus binding site (GCGTG) 1358 bp from the transcription start site (TSS) and a HIF-like site (CCGTG) 826 bp from the TSS. Luciferase assays revealed that the stabilization of HIF by DMOG resulted in the increased activity of the ODZ1 promoter. Conclusions: Our data indicate that the HIF2α-mediated upregulation of ODZ1 helps strengthen the transcriptional control of this migration factor under hypoxia in glioblastoma stem cells. The discovery of this novel transcriptional pathway identifies new targets to develop strategies that may avoid GBM tumor invasion and recurrence.

Landscape of Germline Genetic Variants in AGT, MGMT, and TP53 in Mexican Adult Patients with Astrocytoma.

Astrocytoma is the most common type of primary brain tumor. The risk factors for astrocytoma are poorly understood; however, germline genetic variants account for 25% of the risk of developing gliomas. In this study, we assessed the risk of astrocytoma associated with variants in AGT, known by its role in angiogenesis, TP53, a well-known tumor suppressor and the DNA repair gene MGMT in a Mexican population. A case-control study was performed in 49 adult Mexican patients with grade II-IV astrocytoma. Sequencing of exons and untranslated regions of AGT, MGMT, and TP53 from was carried in an Ion Torrent platform. Individuals with Mexican Ancestry from the 1000 Genomes Project were used as controls. Variants found in our cohort were then assessed in a The Cancer Genome Atlas astrocytoma pan-ethnic validation cohort. Variants rs1926723 located in AGT (OR 2.74, 1.40-5.36 95% CI), rs7896488 in MGMT (OR 3.43, 1.17-10.10 95% CI), and rs4968187 in TP53 (OR 2.48, 1.26-4.88 95% CI) were significantly associated with the risk of astrocytoma after multiple-testing correction. This is the first study where the AGT rs1926723 variant, TP53 rs4968187, and MGMT rs7896488 were found to be associated with the risk of developing an astrocytoma.

A novel pathogenic FERMT1 variant in four families with Kindler syndrome in Argentina.

BACKGROUND: Kindler syndrome is a rare genodermatosis. Major clinical criteria include acral blistering in infancy and childhood, progressive poikiloderma, skin atrophy, abnormal photosensitivity, and gingival fragility. METHODS: FERMT1 gene was sequenced in 5 patients with a clinical diagnosis of Kindler syndrome. RESULTS: We report a novel pathogenic variant detected in four unrelated families of Paraguayan origin, where one nucleotide deletion in FERMT1 gene (c.450delG) is predicted to cause a frameshift mutation leading to loss of function. Haplotype analysis revealed the propagation of an ancestral allele through this population. CONCLUSIONS: The identification of this recurrent pathogenic variant enables optimization of molecular detection strategies in our patients, reducing the cost of diagnosis.

Transitory response of a myelodysplastic syndrome with deletion of chromosome 5q to thalidomide. Report of one case.

Myelodysplastic syndrome with deletion of chromosome 5q (5q-syndrome) has a favorable prognosis and a low risk of transformation to acute myeloid leukemia, when treated with lenalidomide. Azacitidine leads to complete remission even as second-line therapy and in patients with clonal evolution. We report a 70 years old female without previous exposure to myelotoxic drugs, presenting with three weeks with fatigue and dyspnea. She had anemia with normal white blood cell and platelet count. Bone marrow biopsy showed 50% cellularity and the karyotype analysis revealed a (5) (q33q34) deletion in 22% of the metaphases. A diagnosis of 5q-syndrome with low risk calculated using the Revised International Prognostic Scoring System (IPSS-R), was made. Since lenalidomide was not affordable, thalidomide 100 mg/day was initiated, achieving transfusion independence for three years. Afterwards, she developed pancytopenia and a bone marrow biopsy showed erythroid and megakaryocyte dysplasia with a complex karyotype, which worsened prognosis (IPSS-R of five points). Therefore, azacitidine (by donation) was administered. She achieved complete remission with a normal karyotype and completed 12 cycles of treatment. Thereafter, she relapsed and received only supportive care for a year. She suffered an ischemic stroke and died two weeks later.

The Invasion Factor ODZ1 Is Upregulated through an Epidermal Growth Factor Receptor-Induced Pathway in Primary Glioblastoma Cells.

We have previously shown that the transmembrane protein ODZ1 promotes cytoskeletal remodeling of glioblastoma (GBM) cells and invasion of the surrounding parenchyma through the activation of a RhoA-ROCK pathway. We also described that GBM cells can control the expression of ODZ1 through transcriptional mechanisms triggered by the binding of IL-6 to its receptor and a hypoxic environment. Epidermal growth factor (EGF) plays a key role in the invasive capacity of GBM. However, the molecular mechanisms that enable tumor cells to acquire the morphological changes to migrate out from the tumor core have not been fully characterized. Here, we show that EGF is able to induce the expression of ODZ1 in primary GBM cells. We analyzed the levels of the EGF receptor (EGFR) in 20 GBM primary cell lines and found expression in 19 of them by flow cytometry. We selected two cell lines that do or do not express the EGFR and found that EGFR-expressing cells responded to the EGF ligand by increasing ODZ1 at the mRNA and protein levels. Moreover, blockade of EGF-EGFR binding by Cetuximab, inhibition of the p38 MAPK pathway, or Additionally, the siRNA-mediated knockdown of MAPK11 (p38ß MAPK) reduced the induction of ODZ1 in response to EGF. Overall, we show that EGF may activate an EGFR-mediated signaling pathway through p38ß MAPK, to upregulate the invasion factor ODZ1, which may initiate morphological changes for tumor cells to invade the surrounding parenchyma. These data identify a new candidate of the EGF-EGFR pathway for novel therapeutic approaches.

Osteomesopyknosis associated with a novel ALOX5 variant that impacts the RANKL pathway.

BACKGROUND: Bone tissue homeostasis relies on the coordinated activity of the bone-forming osteoblasts and bone-resorbing osteoclasts. Osteomesopyknosis is considered a distinctive rare sclerosing skeletal disorder of unelucidated pathophysiology and presumably autosomal dominant transmission. However, the causal genes are unknown. METHODS: We present a case report encompassing clinical assessments, imaging studies, and whole-exome sequencing analysis, complemented by functional in vitro experiments. RESULTS: This new case of osteomesopyknosis was associated with a missense ALOX5 variant predicted to induce protein misfolding and proteasomal degradation. Transfection experiments demonstrated that the variant was associated with reduced protein levels restored by proteasomal inhibition with bortezomib. Likewise, gene expression analysis showed that the mutated gene was associated with a decreased RANKL/OPG ratio, which is a critical driver of osteoclast precursor differentiation. CONCLUSION: Our data indicate impaired bone resorption as the underlying mechanism of this rare osteosclerosis, implicating ALOX5 pathogenic variants as potential etiological factors.

Overnight stay in Spanish emergency departments and mortality in older patients.

To assess whether older adults who spend a night in emergency departments (ED) awaiting admission are at increased risk of mortality. This was a retrospective review of a multipurpose cohort that recruited all patients ≥ 75 years who visited ED and were admitted to hospital on April 1 to 7, 2019, at 52 EDs across Spain. Study groups were: patients staying in ED from midnight until 8:00 a.m. (ED group) and patients admitted to a ward before midnight (ward group). The primary endpoint was in-hospital mortality, truncated at 30 days, and secondary outcomes assessed length of stay for the index episode. The sample comprised 3,243 patients (median [IQR] age, 85 [81-90] years; 53% women), with 1,096 (34%) in the ED group and 2,147 (66%) in the ward group. In-hospital mortality for patients spending the night in the ED the ED group was 10.7% and 9.5% for patients transferred to a ward bed before midnight the ward group (adjusted OR: 1.12, 95%CI: 0.80-1.58). Sensitivity analyses rendered similar results (ORs ranged 1.06-1.13). Interaction was only detected for academic/non-academic hospitals (p < 0.001), with increased mortality risk for the latter (1.01, 0.33-3.09 vs 2.86, 1.30-6.28). There were no differences in prolonged hospitalization (> 7 days), with adjusted OR of 1.16 (0.94-1.43) and 1.15 (0.94-1.42) depending on whether time spent in the ED was or was not taken into consideration. No increased risk of in-hospital mortality or prolonged hospitalization was found in older patients waiting overnight in the ED for admission. Nonetheless, all estimations suggest a potential harmful effect of staying overnight, especially if a proper bedroom and hospitalist ward bed and hospitalized care are not provided.

Signaling Pathways Regulating the Expression of the Glioblastoma Invasion Factor TENM1.

Glioblastoma (GBM) is one of the most aggressive cancers, with dismal prognosis despite continuous efforts to improve treatment. Poor prognosis is mostly due to the invasive nature of GBM. Thus, most research has focused on studying the molecular players involved in GBM cell migration and invasion of the surrounding parenchyma, trying to identify effective therapeutic targets against this lethal cancer. Our laboratory discovered the implication of TENM1, also known as ODZ1, in GBM cell migration in vitro and in tumor invasion using different in vivo models. Moreover, we investigated the microenvironmental stimuli that promote the expression of TENM1 in GBM cells and found that macrophage-secreted IL-6 and the extracellular matrix component fibronectin upregulated TENM1 through activation of Stat3. We also described that hypoxia, a common feature of GBM tumors, was able to induce TENM1 by both an epigenetic mechanism and a HIF2α-mediated transcriptional pathway. The fact that TENM1 is a convergence point for various cancer-related signaling pathways might give us a new therapeutic opportunity for GBM treatment. Here, we briefly review the findings described so far about the mechanisms that control the expression of the GBM invasion factor TENM1.

Acetylator status and N-acetyltransferase 2 gene polymorphisms; phenotype-genotype correlation with the sulfamethazine test.

N-acetyltransferase 2 (NAT2) catalyzes the bioactivation and/or detoxification of drugs and carcinogens. The aim of this study was to establish the correlation between the NAT2 genotype and the acetylating phenotype in a Mexican population using sulfamethazine as a probe. From a total of 122 individuals, 73 (59.8%) were slow and 49 (40.2%) were fast acetylators. Eleven individuals (9%) had the wild-type genotype (NAT2*4/NAT2*4). The most frequent genotype was NAT2*4/NAT2*5B observed in 20.66% of individuals. In conclusion, our results show that an accurate prediction of the acetylation phenotype by genotyping can be achieved in around half of the population. Further studies with a larger number of individuals are required to establish correlations between phenotype and genotype in half of that patients having a genotype combined with slow/rapid alleles.

Glioblastoma invasion factor ODZ1 is induced by microenvironmental signals through activation of a Stat3-dependent transcriptional pathway.

We have previously shown that the transmembrane protein ODZ1 serves for glioblastoma (GBM) cells to invade the surrounding tissue through activation of RhoA/ROCK pathway. However, the transcriptional machinery used by GBM cells to regulate the expression of ODZ1 is unknown. Here we show that interaction with tumor microenvironment elements, mainly activated monocytes through IL-6 secretion, and the extracellular matrix protein fibronectin, induces the Stat3 transcriptional pathway and upregulates ODZ1 which results in GBM cell migration. This signaling route is abrogated by blocking the IL-6 receptor, inhibiting Jak kinases or knocking down Stat3. Furthermore, we have identified a Stat3 responsive element in the ODZ1 gene promoter, about 1 kb from the transcription start site. Luciferase-reporter assays confirmed that the promoter responds to the presence of monocytic cells and this activation is greatly reduced when the Stat3 site is mutated or following treatment with a neutralizing anti-IL-6 receptor antibody or transfecting GBM cells with a dominant negative variant of Stat3. Overall, we show that monocyte-secreted IL-6 and the extracellular matrix protein fibronectin activate the axis Stat3-ODZ1 and promote migration of GBM cells. This is the first described transcriptional mechanism used by tumor cells to promote the expression of the invasion factor ODZ1.

Hypoxia Can Induce Migration of Glioblastoma Cells Through a Methylation-Dependent Control of ODZ1 Gene Expression.

The transmembrane protein ODZ1 has been associated with the invasive capacity of glioblastoma (GBM) cells through upregulation of RhoA/ROCK signaling, but the mechanisms triggering the ODZ1 pathway remain elusive. In addition, it is widely accepted that hypoxia is one of the main biological hallmarks of the GBM microenvironment and it is associated with treatment resistance and poor prognosis. Here we show that hypoxic tumor regions express higher levels of ODZ1 and that hypoxia induces ODZ1 expression in GBM cells by regulating the methylation status of the ODZ1 promoter. Hypoxia-induced upregulation of ODZ1 correlates with higher migration capacity of GBM cells that is drastically reduced by knocking down ODZ1. In vitro methylation of the promoter decreases its transactivation activity and we found a functionally active CpG site at the 3'end of the promoter. This site is hypermethylated in somatic neural cells and mainly hypomethylated in GBM cells. Mutagenesis of this CpG site reduces the promoter activity in response to hypoxia. Overall, we identify hypoxia as the first extracellular activator of ODZ1 expression and describe that hypoxia controls the levels of this migration-inducer, at least in part, by regulating the methylation status of the ODZ1 gene promoter.

Deficiency of CARD8 is associated with increased Alzheimer's disease risk in women.

NF-kappaB, a major transcription factor controlling inflammation, is activated in Alzheimer's disease (AD) brains. CARD8 protein has been implicated in the suppression of NF-kappaB activity, but a truncating polymorphism (p.C10X, rs2043211) renders a non-functional CARD8 protein that gives rise to a more active NF-kappaB and an amplification of the inflammatory process. Apolipoprotein E (ApoE) epsilon4 allele, the major genetic risk factor of AD, is associated with hyperactivation of NF-kappaB and enhanced brain inflammation. In a case-control study in 300 AD patients and 300 healthy controls, we examined whether the CARD8 (p.C10X) polymorphism, independently or in concert with the ApoE epsilon4 allele, might predispose to AD. Women, but not men, carrying the CARD8 AA genotype (truncated protein) had a 2.39-fold higher risk of developing AD than subjects with the CARD8 TT genotype (full-length protein). This association with susceptibility to AD was independent of the ApoE epsilon4 allele.

Thiopurine S-methyltransferase gene (TMPT) polymorphisms in a Mexican population of healthy individuals and leukemic patients.

Polymorphisms at the thiopurine S-methyltransferase coding gene (TPMT) determine enzyme activity and consequently, the development of toxicity secondary to thiopurines. Methods A total of 108 DNA samples from volunteer donors and 39 from patients with acute lymphoblastic leukemia (ALL) were analyzed. Genomic DNA from peripheral blood leukocytes was isolated by standard methods. TPMT gene fragments were amplified by PCR for exons 5, 7, and 10. Thereafter, these were analyzed by DHPLC for the most frequent mutant TPMT alleles. Results No elution profiles on DHPLC analysis, different from those previously reported, were documented. Frequency of functional allele polymorphisms was 17.6%, being the most frequent *3A (n = 13; 4.4%), followed by *3B (n = 5; 1.7%), *3C (n = 5; 1.7%), and *2 (n = 3; 1.0%). From 39 ALL patients, 22 were treated with thiopurines, and five from 10 with a functional polymorphism developed hematological toxicity (4 mild, 1 severe in a patient referred to our Hospital after developing pancytopenia while on treatment with thiopurine). Conclusions This is the first analysis of the polymorphisms at this gene in Mexican population. Since a direct relation has been documented within functional polymorphisms and enzyme activity, and DHPLC is a highly sensitive, rapid and efficient method, feasible to realize in any phase during the treatment of ALL patients, the routine typing of TPMT polymorphisms in the patients with ALL has been set in our Institution.

NFκB activation in differentiating glioblastoma stem-like cells is promoted by hyaluronic acid signaling through TLR4.

We have previously described that the NFκB pathway is upregulated during differentiation of glioblastoma stem-like cells (GSCs) which keeps differentiating GSCs in a proliferative astrocytic precursor state. However, extracellular signals and cellular mediators of this pathway are not clear yet. Here, we show that TLR4 is a key factor to promote NFκB activation in differentiating GSCs. TLR4 is upregulated during differentiation of GSCs and promotes transcriptional activation of NFκB as determined by luciferase-reporter assays and expression of NFκB target genes. Downregulation of TLR4 by shRNAs or blockade with anti-TLR4 specific antibodies drastically inhibited NFκB activity which promoted further differentiation and reduced proliferation of GSCs. We found that hyaluronic acid (HA), a main component of brain extracellular matrix, triggers the TLR4-NFκB pathway in differentiating GSCs. Moreover, HA is synthesized and released by GSCs undergoing differentiation and leads to transcriptional activation of NFκB, which is inhibited following downregulation of TLR4 or blockade of HA synthesis. Thus, we have demonstrated that during the process of differentiation, GSCs upregulate TLR4 and release the TLR4 ligand HA, which activates the TLR4-NFκB signaling pathway. This strategy may efficiently be used by differentiating GSCs to maintain their proliferative potential and consequently their tumorigenic capacity.

Angiotensinogen rs5050 germline genetic variant as potential biomarker of poor prognosis in astrocytoma.

INTRODUCTION: Renin-angiotensin system (RAS) in brain cancer represents a scarcely explored field in neuro-oncology. Recently, some pre- and clinical studies have reported that RAS components play a relevant role in the development and behavior of gliomas. The angiotensinogen (AGT) rs5050 genetic variant has been identified as a crucial regulator of the transcription of AGT mRNA, which makes it a logical and promising target of research. The aim of this study was to determine the relationship between the AGT rs5050 genetic variant in blood with prognosis in astrocytoma. METHODS: A prospective pilot study was performed on forty-eight astrocytoma patients, who received the standard-of-care treatment. Blood samples were taken prior to surgery and DNA was sequenced using Ion Torrent next-generation sequencing and analyzed by Ion Reporter software. Descriptive, bivariate, multivariate, and survival analyses were performed using SPSS v21, STATA 12 and GraphPad Prism 7. RESULTS: Median follow-up was 41 months (range 1-48). Survival analysis showed a significant difference between the rs5050 genotypes (p = .05). We found lower survival rates in individuals with the GG-genotype of rs5050 AGT compared to patients with the TT- and TG-genotype (2 months vs. 11.5 months, respectively [p = .01]). In bivariate and multivariate analyses, GG-genotype was negatively associated with survival. CONCLUSIONS: In patients with astrocytoma, AGT rs5050 GG-genotype was associated with poor prognosis. We propose this germline genetic variant as a complementary biomarker, which can be detected practically and safely in blood samples or saliva.

Alteraciones cutáneas en neonatos que consultan en el departamento de urgencias pediátricas de un hospital público

RESUMEN Introducción: Los procesos dermatológicos pediátricos son problemas frecuentes a los que se enfrentan los pediatras durante la consulta Como tales debe estar familiarizados con las patologías cutáneas más comunes del recién nacido. Es de suma importancia realizar un diagnóstico correcto e instaurar una terapia adecuada para el futuro bienestar del niño que está iniciando su vida. Objetivo: Determinar la frecuencia y los tipos de alteraciones o lesiones cutáneas en neonatos que acuden al departamento de emergencias pediátricas de un hospital de referencia. Materiales y Métodos: Estudio observacional, descriptivo, prospectivo, transversal. Se evaluó neonatos que consultaron por lesiones en la piel en el Departamento de emergencias pediátricas de agosto a diciembre de 2018. Variables: Edad, sexo, procedencia, vía de nacimiento, edad gestacional, ingreso a la unidad de cuidados intensivos neonatales, tipo y extensión de las lesiones, síntomas asociados, y diagnósticos. Análisis de datos: SPSS v21 utilizando estadísticas descriptivas. Protocolo aceptado por el comité de ética institucional con consentimiento informado de los padres. Resultados: Fueron atendidos 416 neonatos, de los cuales 19,2% (N=80) consultaron por lesiones cutáneas, 32,5% (26/80) fueron pápulas, ampollas 1,3% (1/80), siendo 68,8% (55/80) localizadas. El diagnóstico de mayor frecuencia fue eritema tóxico en 21,3% (17/80). La fiebre estuvo asociada en 6,3% (5/80) a las infecciones de piel y un neonato presento sepsis bacteriana con puerta de entrada cutánea. Conclusiones: las lesiones cutáneas más frecuentes fueron las lesiones transitorias. El eritema toxico fue la alteración cutánea predominante. Las infecciones de piel se presentaron en el 25% % en neonatos

ABSTRACT Introduction: Pediatric dermatological processes are frequent problems that pediatricians face during consultation. As such, they must be familiar with the most common skin pathologies of the newborn. It is extremely important to make a correct diagnosis and establish an appropriate therapy for the future well-being of the child who is beginning his life. Objective: To determine the frequency and types of alterations or skin lesions in newborns who present to the pediatric emergency department of a reference hospital. Materials and Methods: This was an observational, descriptive, prospective and cross-sectional study. Newborns who consulted for skin lesions in the Pediatric Emergency Department from August to December 2018 were evaluated. Variables were age, sex, place of origin, route of birth, gestational age, admission to the neonatal intensive care unit, type and extension of injuries, associated symptoms, and diagnoses. Data analysis: SPSS v21 using descriptive statistics. Our protocol was accepted by the institutional ethics committee, parental informed consent was obtained. Results: 416 newborns were treated, of which 19.2% (N=80) consulted for skin lesions, 32.5% (26/80) were papules, blisters 1.3% (1/80), 68,8% (55/80) were localized findings. The most frequent diagnosis was toxic erythema in 21.3% (17/80). Fever was associated in 6.3% (5/80) with skin infections and one newborn presented with bacterial sepsis from a cutaneous entry portal. Conclusions: the most frequent skin lesions were transient lesions. Toxic erythema was the predominant cutaneous alteration. Skin infections occurred in 25% % in newborns.

Transcriptional activation of the proapoptotic bik gene by E2F proteins in cancer cells.

BH3-only proteins are required for execution of apoptotic cell death. We have found that one of these proteins, Bik, is strongly induced in cancer cells treated with chemotherapeutic agents. Furthermore, we showed that chemotherapy-induced expression of bik is independent of p53. Consistent with its pro-apoptotic activity, blockade of bik expression reduces the adriamycin-mediated apoptotic cell death. We also found that the bik gene is transcriptionally activated by E2F proteins. Consistently, adriamycin induces the E2F-bik pathway. In addition, E2Fs transactivate bik by a p53-independent mechanism. Thus, our data indicate that transcriptional regulation of bik contributes to the efficient apoptotic response to chemotherapeutic agents.

Evaluation of 4 swab transport systems for the recovery of ATCC and clinical strains with characterized resistance mechanisms.

Despite limitations of swab transport systems (STS), many clinical samples and bacterial isolates are sent on these devices. We evaluated the performance of 4 commercial STS: M40 Transystem (S1, Copan Italia, Bovezzo, Italy), UNI-TER (S2, MEUS, Piove di Sacco, Italy), Euromed (S3, LAB SERVICE, Surbo, Italy), and Eurotubo (S4, Deltalab, Rubí, Spain). Survival of ATCC and clinical strains with characterized resistance mechanisms, stored at room temperature and using the roll-plate method (NCCLS M40-A) after holding times of 0, 6, 24, 48, and 72 h, and 7 days, was assessed. After 24 h, only S1 was able to maintain Streptococcus pneumoniae (ATCC 6305), Haemophilus influenzae (10211), and Neisseria meningitidis (13090) viability with a percentage range of recovery with respect to the baseline count at zero time of 104-184%. Neisseria gonorrhoeae (43069) was uncultivable after 6 h with all STS except S1 (46% recovery). Eighteen percent recovery after 24 h and 7% after 6 h was observed for Fusobacterium nucleatum (25586) and Peptostreptococcus anaerobius (27337), respectively, but only with S1. Resistance mechanisms in clinical isolates do not affect survival with any of the STS.