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1.
Abortive potency of Chlamydophila abortus in pregnant mice is not directly correlated with placental and fetal colonization levels
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Abortion, placental and fetal colonization, and levels of gamma interferon were analyzed for four Chlamydophila abortus strains presenting antigenic variations in a mouse model. Expression of virulence of these strains varied and indicated that abortion was not directly related to the number of bacteria in the placenta, and thus, other factors may have an important role in activating the abortion process. 相似文献
2.
Tlili A Charfedine I Lahmar I Benzina Z Mohamed BA Weil D Idriss N Drira M Masmoudi S Ayadi H 《Human mutation》2005,25(5):503
Approximately 80% of hereditary hearing loss is non-syndromic. Non-syndromic deafness is the most genetically heterogeneous trait. The most common and severe form of hereditary hearing impairment is autosomal recessive non-syndromic hearing loss (ARNSHL), accounting for approximately 80% of cases of genetic deafness. To date, 22 genes implicated in ARNSHL have been identified. Recently a gene, DFNB31/WHRN, which encodes a putative PDZ scaffold protein called whirlin, was found to be responsible for the ARNSHL DFNB31. We found evidence for linkage to the DFNB31locus in a consanguineous Tunisian family segregating congenital profound ARNSHL. Mutation screening of DFNB31/WHRNrevealed four nonpathogenic sequence variants and a novel frameshift mutation [c.2423delG] + [c.2423delG] that changed the reading frame and induced a novel stop codon at amino acid 818 ([p.Gly808AspfsX11] + [p.Gly808AspfsX11]). To determine the contribution of the DFNB31locus in the childhood deafness, we performed linkage analysis in 62 unrelated informative families affected with ARNSHL. No linkage was found to this locus. From this study, we concluded that DFNB31/WHRN is most likely to be a rare cause of ARNSHL in the Tunisian population. 相似文献
3.
Ibtihel Rebai Ichraf Kraoua Hanene Benrhouma Aida Rouissi Ilhem Turki Irène Ceballos-Picot Neziha Gouider-Khouja 《Brain & development》2014
Lesch Nyhan syndrome (LNS) is an X-linked recessive disorder due to complete deficiency of the hypoxanthine–guanine phosphoribosyltransferase (HPRT) enzyme. Defect of the enzymatic activity is related to mutations of the HPRT1 gene. The disorder severity is due to neurological features and renal complications. Up to now, more than 300 mutations have been reported. We report on a Tunisian child with a severe phenotype due to a novel identified complex mutation. 相似文献
4.
Thouraya Chérif Mabrouka Saidani Dominique Decré Ilhem Boutiba-Ben Boubaker Guillaume Arlet 《Antimicrobial agents and chemotherapy》2016,60(1):44-51
Over a period of 40 months, plasmid-mediated AmpC β-lactamases were detected in Tunis, Tunisia, in 78 isolates (0.59%) of Escherichia coli, Klebsiella pneumoniae, and Proteus mirabilis. In 67 isolates, only one ampC gene was detected, i.e., blaCMY-2-type (n = 33), blaACC (n = 23), blaDHA (n = 6) or blaEBC (n = 5). Multiple ampC genes were detected in 11 isolates, with the following distribution: blaMOX-2, blaFOX-3, and blaCMY-4/16 (n = 6), blaFOX-3 and blaMOX-2 (n = 3), and blaCMY-4 and blaMOX-2 (n = 2). A great variety of plasmids carrying these genes was found, independently of the species and the bla gene. If the genetic context of blaCMY-2-type is variable, that of blaMOX-2, reported in part previously, is unique and that of blaFOX-3 is unique and new. 相似文献
5.
Mariam Siala Nadia Mahfoudh Radhouane Gdoura Mohamed Younes Hela Fourati Arwa Kammoun Ilhem Chour Nihel Meddeb Lilia Gaddour Faiza Hakim Sofien Baklouti Naceur Bargaoui Sleheddine Sellami Adnene Hammami Hafedh Makni 《Rheumatology international》2009,29(10):1193-1196
The purpose of the present study is to investigate the frequency of HLA-B27 and its alleles in reactive arthritis (ReA) and
in ankylosing spondylitis (AS) in Tunisia. HLA-B27 alleles were typed by PCR amplification with sequence-specific primers.
We studied 17 patients with ReA associated with urethritis or with gastrointestinal infection; 42 HLA-B27-positive patients
with AS and 100 healthy controls. Eleven ReA patients (67.7%) were HLA-B27 positive. There was an increased frequencies of
HLA-B27 (P = 7.76 × 10−12, OR = 59.30) and a moderate increase of HLA-B51 (P = 0.015; OR = 4.91) alleles in ReA patients when compared with healthy controls. Four B27 subtypes were identified: B*2702,
05, 09 and B*2712. The distribution of these alleles in the ReA patients was 37.5% for B*2702 and B*2705. Only these two subtypes
were detected in 18 (42.8%) and 24 (57.1%), respectively, of the AS patients. B*2709 and B*2712 were relatively rare in ReA
patients and were identified in one case each. Our results showed a restricted number of HLA-B27 subtypes associated with
ReA and AS. B*2702 and 2705 were common in ReA and AS patients. 相似文献
6.
Thabet L Boutiba I Kammoun A Khelif L Mahjoubi F Smaoui H Kechrid A Ben Redjeb S Hammami A 《La Tunisie médicale》2002,80(8):469-472
Haemophilus influenzae, a commensal bacteria, is frequently incriminated in broncho--pulmonary surinfections and severe diseases as meningitis, pneumonia and septic arthritis, particularly in young children. A multicenter study was conducted to establish the epidemiological profile of Haemophilus influenzae diseases, to determine the rate of antibiotics resistance for guide therapeutic and preventive strategies. The identification was based on the requirements for X and V factors, and the serotype b determined by agglutination. The betalactamase production was done by nitrocefin test. Antimicrobial susceptibility testing was determined on Muller Hinton chocolate agar with isovitalex. During the two year period, (January 1998 December 1999), 192 isolates of H. Influenzae were collected, 61% were recovered from invasive infections (44 meningitis, 8 bacteremia, 2 arthritis). The serotype b was identified in 55.7% of cases, 67.3% were invasive strains. 24.5% of isolates were producing betalactamase particularly invasive serotype b strains. All isolates of H. influenzae were susceptible to cefotaxim and to ofloxacin. Resistance rates to other antibiotics were: erythromycin 56.2%, tetracyclin 10.3%, rifampin 12%, chloramphénicol 1%, cotrimoxazole 16.5%, 11.5% amikacin and 20% gentamicin. The incidence of meningitis remained frequent in our country, involving the introduction of the vaccination in official calendar. Nevertheless, the surveillance of H. influenzae invasives infections and the serotyping of isolates were necessary to evaluate the impact of the immunization. 相似文献
7.
Dorra Ben Salah Mohamed Besbes Ilhem Boutiba André Greco Rafia Ghozzi Faouzia Mahjoubi Sa?da Ben Rejeb Adnène Hammami Assia Ben Hassen 《La Tunisie médicale》2003,81(2):109-112
676 E. faecalis strains were listed over a period of 2 years from the Charles Nicolle hospital of Tunis (167 strains), the Habib Bourguiba hospital of Sfax (350 strains) and the National Centre of Bone marrow Transplantation of Tunis (159 strains). Antibiotic sensibility study was realized by the method of the antibiogram, E-test method and the search of penicillinase by cefinase. E. faecalis resulted essentially from services of onco-haematology (24%), external consultations (23%), surgery (18%) and medicine (15%). These strains were isolated especially from urines (54%), coprocultures (15%), bloodcultures (11%) and from pus (9%). Resistance acquired with these strains is raised for erythromycin, tetracyclin and chloramphenicol (81% to 86%), followed by high level resistance to gentamicine (37%). 0.1% of E. faecalis strains have a low level resistance to amoxicillin without production of penicillinase. No resistance to vancomycin was observed. 相似文献
8.
Cicin-Sain L Messaoudi I Park B Currier N Planer S Fischer M Tackitt S Nikolich-Zugich D Legasse A Axthelm MK Picker LJ Mori M Nikolich-Zugich J 《Proceedings of the National Academy of Sciences of the United States of America》2007,104(50):19960-19965
The loss of naïve T cells is a hallmark of immune aging. Although thymic involution is a primary driver of this naïve T cell loss, less is known about the contribution of other mechanisms to the depletion of naïve T cells in aging primates. We examined the role of homeostatic cycling and proliferative expansion in different T cell subsets of aging rhesus macaques (RM). BrdU incorporation and the expression of the G1-M marker Ki-67 were elevated in peripheral naïve CD4 and even more markedly in the naïve CD8 T cells of old, but not young adult, RM. Proliferating naïve cells did not accumulate in old animals. Rather, the relative size of the naïve CD8 T cell compartment correlated inversely to its proliferation rate. Likewise, T cell receptor diversity decreased in individuals with elevated naïve CD8 T cell proliferation. This apparent contradiction was explained by a significant increase in turnover concomitant with the naïve pool loss. The turnover increased exponentially when the naïve CD8 T cell pool decreased below 4% of total blood CD8 cells. These results link the shrinking naïve T cell pool with a dramatic increase in homeostatic turnover, which has the potential to exacerbate the progressive exhaustion of the naïve pool and constrict the T cell repertoire. Thus, homeostatic T cell proliferation exhibits temporal antagonistic pleiotropy, being beneficial to T cell maintenance in adulthood but detrimental to the long-term T cell maintenance in aging individuals. 相似文献
9.
10.
Ilhem Mili-Boussen Omar Gharbi Imen Letaief Hassen Dridi Selma Touati Khalil Errais Amel Ouertani 《International ophthalmology》2013,33(6):733-736
To describe particular iris precipitates in a series of five eyes from six patients with Fuchs uveitis (FU). Iris precipitates were noted by four independent examiners during routine physical examination of the angle by gonioscopy with Goldmann’s three-mirror lens in patients with FU. The result was confirmed by examination, using the same method, of five other consecutive patients with FU and compared to 10 normal control eyes from five healthy individuals. Other causes of anterior uveitis were excluded. There were no iris precipitates in the healthy eyes. In eyes with FU, there were fluffy white iris precipitates, not visible by full-face examination or by classic slit-lamp examination. They were similar to keratic precipitates described in FU: starry, blurry and transparent with a tendency towards the white. Situated on the surface of the iris, they were visible only with the particular diffusion of the light from the gonioscopy’s glass on the darkly pigmented iris of patients from North Africa. Fluffy white iris precipitates, seen in FU patients, appear to represent an additional clinical sign and may improve our diagnostic accuracy in this disease. Its visibility requires a specific technique during clinical examination. The validity of this new clinical sign based on this fact is yet to be determined. 相似文献