Publications by authors named "Maria Theodorou"

Tissue-resident memory T (T) cells are integral to tissue immunity, persisting in diverse anatomical sites where they adhere to a common transcriptional framework. How these cells integrate distinct local cues to adopt the common T cell fate remains poorly understood. Here, we show that whereas skin T cells strictly require transforming growth factor β (TGF-β) for tissue residency, those in other locations utilize the metabolite retinoic acid (RA) to drive an alternative differentiation pathway, directing a TGF-β-independent tissue residency program in the liver and synergizing with TGF-β to drive T cells in the small intestine.

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Background: Lacticaseibacillus (formerly Lactobacillus) rhamnosus is widely used in probiotics or food supplements to promote microbiome health and may also be part of the normal microbiota of the human gastrointestinal tract. However, it rarely also causes invasive or severe infections in patients. It has been postulated that these infections may originate from probiotics or from endogenous commensal reservoirs.

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Objective: We explored neural components in Electroencephalography (EEG) signals during a phonological processing task to assess (a) the neural origins of Baddeley's working-memory components contributing to phonological processing, (b) the unitary structure of phonological processing and (c) the neural differences between children with dyslexia (DYS) and controls (CAC).

Methods: EEG data were collected from sixty children (half with dyslexia) while performing the initial- and final- phoneme elision task. We explored a novel machine-learning-based approach to identify the neural components in EEG elicited in response to the two conditions and capture differences between DYS and CAC.

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Objective: Naming speed, behaviorally measured via the serial Rapid automatized naming (RAN) test, is one of the most examined underlying cognitive factors of reading development and reading difficulties (RD). However, the unconstrained-reading format of serial RAN has made it challenging for traditional EEG analysis methods to extract neural components for studying the neural underpinnings of naming speed. The present study aims to explore a novel approach to isolate neural components during the serial RAN task that are (a) informative of group differences between children with dyslexia (DYS) and chronological age controls (CAC), (b) improve the power of analysis, and (c) are suitable for deciphering the neural underpinnings of naming speed.

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Background: It is important to understand the pathophysiology of ocular myasthenia gravis (OMG) to improve treatment.

Aim: To use modern video-oculography to characterise saccadic eye movements in patients with OMG, including anti-AChR, anti-MuSK, anti-LRP4, and seronegative OMG.

Methods: In total, 21 patients with OMG and five age-matched healthy control subjects underwent video-oculography.

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Article Synopsis
  • - Idiopathic infantile nystagmus (IIN) is a genetic disorder affecting infants in the first six months, primarily caused by mutations, but requires ruling out other serious conditions before diagnosis.
  • - A comprehensive approach combining eye tests and genetic sequencing is necessary to identify the exact cause of IIN.
  • - In a study of 22 patients, 36% were given a confirmed genetic diagnosis, revealing new mutations and emphasizing the importance of thorough testing in managing IIN.
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Introduction: Nystagmus has been reported in up to 30% of people with Down Syndrome (DS), and yet is still not well understood. Our study aims to characterise the clinical features of patients with DS and nystagmus.

Methods: A retrospective medical-records review was conducted of all patients with a diagnosis of DS and nystagmus seen at Moorfields Eye Hospital over a ten-year period.

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Idiopathic infantile nystagmus syndrome is a disorder characterised by involuntary eye movements, which leads to decreased acuity and visual function. One such function is visual crowding - a process whereby objects that are easily recognised in isolation become impaired by nearby flankers. Crowding typically occurs in the peripheral visual field, although elevations in foveal vision have been reported in congenital nystagmus, similar to those found with amblyopia.

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Background: A small number of patients are disproportionally readmitted to hospitals. The Complex High Admission Management Program (CHAMP) was established as a multidisciplinary program to improve continuity of care and reduce readmissions for frequently hospitalized patients.

Objective: To compare hospital utilization metrics among patients enrolled in CHAMP and usual care.

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Aim: To describe a case of acquired Periodic Alternating Nystagmus (PAN) with oscillopsia treated with botulinum toxin injections into four horizontal rectus muscles.

Method: A 22-year-old woman presented with sudden onset PAN. The only abnormality found following extensive investigations was bilateral superior cerebellar peduncle atrophy on MRI.

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Purpose: To compare the 1-year outcomes of treat-and-extend and pro re nata (PRN) treatment regimens with aflibercept for polypoidal choroidal vasculopathy (PCV), by the means of visual acuity (VA), frequency of recurrence of polypoidal lesions and developed fibrosis, and the number of intravitreal injections, and thus to determine which one is preferable in the maintenance phase in PCV.

Methods: In our prospective study, only naive and previously untreated PCV patients were included. Initially one session of photodynamic therapy (PDT) and three monthly intravitreal injections of 2.

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Albinism encompasses a group of hereditary disorders characterized by reduced or absent ocular pigment and variable skin and/or hair involvement, with syndromic forms such as Hermansky-Pudlak syndrome and Chédiak-Higashi syndrome. Autosomal recessive oculocutaneous albinism (OCA) is phenotypically and genetically heterogenous (associated with seven genes). X-linked ocular albinism (OA) is associated with only one gene, .

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Biallelic pathogenic variants in solute carrier family 38 member 8, , cause a pan-ocular autosomal recessive condition known as foveal hypoplasia 2, FVH2, characterised by foveal hypoplasia, nystagmus and optic nerve chiasmal misrouting. Patients are often clinically diagnosed with ocular albinism, but foveal hypoplasia can occur in several other ocular disorders. Here we describe nine patients from seven families who had molecularly confirmed biallelic recessive variants in identified through whole genome sequencing or targeted gene panel testing.

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species may translocate from the gastrointestinal tract into systemic circulation from ingested probiotics or commensal flora. Their pathogenic potential is still debated. endocarditis is a rare entity with only around 120 cases reported in the literature.

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Purpose: The interaction of diet with gut microbiome has been implicated in the onset of cardiovascular disease. The gut microbiome displays diurnal rhythms, which may be influenced by meal timing.

Objective: This study aimed to investigate the effect of the timing of main meal consumption on the microbiome and cardiometabolic biomarkers of the host.

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Article Synopsis
  • PAX6 is a key gene in eye development, and its variants often lead to an eye disorder called aniridia, but some mutations are linked to different issues like foveal hypoplasia.
  • This study introduces two specific mutations in PAX6 that result in isolated foveal hypoplasia and nystagmus in two families, showing that the mutations occur in the gene’s paired domain.
  • The research also reveals that the fathers of affected individuals carry a postzygotic mosaicism, meaning their affected alleles are present in a smaller fraction of their cells, highlighting the need for accurate genetic counseling and awareness of inheritance patterns.
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Purpose: Conventional static visual acuity testing profoundly underestimates the impact of infantile nystagmus on functional vision. The slow-to-see phenomenon explains why many patients with nystagmus perform well in non-time restricted acuity tests but experience difficulty in certain situations. This is often observed by parents when their child struggles to recognise familiar faces in crowded scenes.

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Purpose: To describe the nystagmus characteristics of subjects with molecularly confirmed CNGB3-associated achromatopsia and report the spectral domain optical coherence tomography (SD-OCT) findings in these individuals.

Methods: Adults and children with CNGB3-achromatopsia underwent visual acuity testing, ocular motility assessments, video nystagmography, and SD-OCT imaging. Qualitative assessment of foveal structure was performed by grading SD-OCT images into one of five categories.

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Comprehensive care plans are dynamic documents maintained by an interdisciplinary team that contain specific, actionable information for clinicians and staff across multiple care settings. They promote communication and continuity of care by suggesting communication strategies, medical plans, and psychosocial resources. This article describes the structure and development process of comprehensive care plans for frequently hospitalized patients enrolled in a program designed to improve care for this vulnerable population.

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Purpose: To explore the impact of childhood lensectomy on posterior segment development.

Methods: Cross-sectional observational study at children's eye clinics at a tertiary referral center in London, UK. We included 45 children age 4 to 16 years with healthy eyes and 38 who had undergone lensectomy.

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The hydroponic cultivation of spiny chicory ( L.), also known as stamnagathi, allows the development of year-round production. In the current study, two contrasting stamnagathi ecotypes originating from a montane and a coastal-marine habitat were supplied with nutrient solution containing 4 or 16 mM total-N in combination with 0.

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Purpose: IINS is associated with mild/moderate visual impairment, strabismus and compensatory head postures (CHP), which can negatively impact quality of life. Standard visual acuity assessments tend to underestimate the effect of IINS on visual functioning. Published evidence on the effect of INS on quality of life is slowly emerging.

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Purpose: Trauma is an important cause of visual loss in children and may affect their quality of life. Prevention and legislation can reduce the incidence of trauma, and appropriate and timely treatment can improve prognosis. We aimed to describe incidence of eye injuries in children and the adherence to national and local management guidelines.

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Purpose: To compare Schlemm canal (SC) and trabecular meshwork (TM) in children with healthy eyes and those with and without glaucoma after lensectomy.

Design: Cross-sectional observational study.

Participants: Fifty children 4 to 16 years of age with healthy eyes and 48 children who underwent lensectomy (124 healthy and 72 postlensectomy eyes).

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