An Iris Tumor Secondary to Talaromyces Marneffei Infection in a Patient with AIDS and Syphilis

Author(s):  
Tingkun Shi ◽  
Lingjie Wu ◽  
Jinnan Cai ◽  
Haoyu Chen
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Harshini Weerasinghe ◽  
Hayley E. Bugeja ◽  
Alex Andrianopoulos

AbstractMicrobial pathogens have evolved many strategies to evade recognition by the host immune system, including the use of phagocytic cells as a niche within which to proliferate. Dimorphic pathogenic fungi employ an induced morphogenetic transition, switching from multicellular hyphae to unicellular yeast that are more compatible with intracellular growth. A switch to mammalian host body temperature (37 °C) is a key trigger for the dimorphic switch. This study describes a novel gene, msgA, from the dimorphic fungal pathogen Talaromyces marneffei that controls cell morphology in response to host cues rather than temperature. The msgA gene is upregulated during murine macrophage infection, and deletion results in aberrant yeast morphology solely during growth inside macrophages. MsgA contains a Dbl homology domain, and a Bin, Amphiphysin, Rvs (BAR) domain instead of a Plekstrin homology domain typically associated with guanine nucleotide exchange factors (GEFs). The BAR domain is crucial in maintaining yeast morphology and cellular localisation during infection. The data suggests that MsgA does not act as a canonical GEF during macrophage infection and identifies a temperature independent pathway in T. marneffei that controls intracellular yeast morphogenesis.


Fitoterapia ◽  
2021 ◽  
pp. 104948
Author(s):  
Zhong-Duo Yang ◽  
Xu-Dong Zhang ◽  
Xing Yang ◽  
Xiao-Jun Yao ◽  
Zong-Mei Shu

2021 ◽  
Vol 49 (5) ◽  
pp. 030006052110167
Author(s):  
Qian Shen ◽  
Lingyan Sheng ◽  
Jianying Zhou

Talaromyces marneffei is a rare dimorphic pathogenic fungus that can induce severe infections in human immunodeficiency virus (HIV)-infected patients. However, such infections have also been reported in non-HIV hosts. This current case report describes a very rare case of a T. marneffei pulmonary infection in an HIV-negative patient with a mutation in the tuberous sclerosis complex subunit 2 ( TSC2) gene. A 24-year-old male patient presented with cough and expectoration for 6 months. Computed tomography showed multiple ground-glass opacities and cystic and cavitated lesions in both lungs. Next generation sequencing (NGS) of the bronchoalveolar lavage fluid was performed to confirm T. marneffei pulmonary infection. The results were further verified using bronchoscopy specimen cultures. This was an HIV-negative patient without a travel history to endemic zones and his blood exon sequencing results showed a mutation in the TSC2 gene. To date, he has recovered well with voriconazole therapy. In summary, patients with TSC2 mutations that induce bronchopulmonary dysplasia may be potential hosts for T. marneffei. Early and timely diagnosis is important for improving prognosis. NGS plays a critical role in the diagnosis of T. marneffei pulmonary infection.


2019 ◽  
Vol 12 (2) ◽  
pp. 72
Author(s):  
Sem S. Surja ◽  
Robiatul Adawiyah ◽  
Retno Wahyuningsih

Talaromycosis marneffei is a mycotic disease caused by Talaromyces marneffei which primarily infectimmunocompromised patient. This disease is endemic in Southeast Asia, and Indonesia consider as endemic area dueto a case of tourist who got the infection after visiting Indonesia. Diagnosis was made based on clinical suspicion withlaboratory confirmation. Clinical manifestations are not specific, such as fever, anemia, weight loss, lymphadenopathy,hepatomegaly, splenomegaly, respiratory disorder, and cutaneous manifestation. Histopathology and culture are themost common examination performed for diagnosis. In histopathology examination, fungi appear as fission arthroconidiacells which shape round to oval, with cross wall formation inside or outside macrophage and histiocyte. Thermaldimorphism characteristic can be observed in fungal culture. Fungi grows as mold at 25oC-30oC and as yeast at 37oC.Definitive identification of T. marneffei was done by molecular examination using primers derived from ITS region asprimary marker and beta tubulin region as secondary marker. Talaromyces marneffei is sapronosis, that transmitted viainhalation of conidia from environment.


2022 ◽  
pp. 112067212110732
Author(s):  
Andrea Montesel ◽  
Chiara M. Eandi ◽  
Leonidas Zografos

Purpose To describe a unique unilateral association between an iris stromal tumor and a macular focal choroidal excavation. Case Description A 40-year old patient presented with a small iris tumor associated with a unilateral macular lesion disclosed during a routine ophthalmologic examination. The patient was asymptomatic and visual function was not affected. After clinical and instrumental evaluation, a diagnosis of nonmelanocytic undefined stromal tumor of the iris associated with macular focal choroidal excavation was made. The size and shape of the two lesions remained stable during a 7-year follow-up and the patient did not develop other signs. Conclusion The concurrent presence of a stromal iris tumor associated with focal choroidal excavation has never been reported. Further reports of this association are required in order to understand its exact pathogenesis.


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