Differentiating the roles of STAT5B and STAT5A in human CD4+ T cells.

STAT5A and STAT5B are highly homologous proteins whose distinctive roles in human immunity remain unclear. However, STAT5A sufficiency cannot compensate for STAT5B defects, and human STAT5B deficiency, a rare autosomal recessive primary immunodeficiency, is characterized by chronic lung disease, growth failure and autoimmunity associated with regulatory T cell (Treg) reduction. We therefore hypothesized that STAT5A and STAT5B play unique roles in CD4(+) T cells. Upon knocking down STAT5A or STAT5B in human primary T cells, we found differentially regulated expression of FOXP3 and IL-2R in STAT5B knockdown T cells and down-regulated Bcl-X only in STAT5A knockdown T cells. Functional ex vivo studies in homozygous STAT5B-deficient patients showed reduced FOXP3 expression with impaired regulatory function of STAT5B-null Treg cells, also of increased memory phenotype. These results indicate that STAT5B and STAT5A act partly as non-redundant transcription factors and that STAT5B is more critical for Treg maintenance and function in humans.

Loss of interleukin-10 signaling and infantile inflammatory bowel disease: implications for diagnosis and therapy.

BACKGROUND & AIMS: Homozygous loss of function mutations in interleukin-10 (IL10) and interleukin-10 receptors (IL10R) cause severe infantile (very early onset) inflammatory bowel disease (IBD). Allogeneic hematopoietic stem cell transplantation (HSCT) was reported to induce sustained remission in 1 patient with IL-10R deficiency. We investigated heterogeneity among patients with very early onset IBD, its mechanisms, and the use of allogeneic HSCT to treat this disorder. METHODS: We analyzed 66 patients with early onset IBD (younger than 5 years of age) for mutations in the genes encoding IL-10, IL-10R1, and IL-10R2. IL-10R deficiency was confirmed by functional assays on patients' peripheral blood mononuclear cells (immunoblot and enzyme-linked immunosorbent assay analyses). We assessed the therapeutic effects of standardized allogeneic HSCT. RESULTS: Using a candidate gene sequencing approach, we identified 16 patients with IL-10 or IL-10R deficiency: 3 patients had mutations in IL-10, 5 had mutations in IL-10R1, and 8 had mutations in IL-10R2. Refractory colitis became manifest in all patients within the first 3 months of life and was associated with perianal disease (16 of 16 patients). Extraintestinal symptoms included folliculitis (11 of 16) and arthritis (4 of 16). Allogeneic HSCT was performed in 5 patients and induced sustained clinical remission with a median follow-up time of 2 years. In vitro experiments confirmed reconstitution of IL-10R-mediated signaling in all patients who received the transplant. CONCLUSIONS: We identified loss of function mutations in IL-10 and IL-10R in patients with very early onset IBD. These findings indicate that infantile IBD patients with perianal disease should be screened for IL-10 and IL-10R deficiency and that allogeneic HSCT can induce remission in those with IL-10R deficiency.

Statistical inference with joint progressive censoring for two populations using power Rayleigh lifetime distribution.

In this study, point and interval estimations for the power Rayleigh distribution are derived using the joint progressive type-II censoring technique. The maximum likelihood and Bayes methods are used to estimate the two distributional parameters. The estimators' approximate credible intervals and confidence intervals have also been determined. The Markov chain Monte Carlo (MCMC) method is used to provide the findings of Bayes estimators for squared error loss and linear exponential loss functions. The Metropolis-Hasting technique uses Gibbs to generate MCMC samples from the posterior density functions. A real data set is used to show off the suggested approaches. Finally, in order to compare the results of various approaches, a simulation study is performed.

Influential Radiology Figures and Organizations in Social Media.

PURPOSE: With social media becoming a vibrant hub for the radiology community, highlighting expert leaders and trustful conduits of information in the virtual field is proving crucial. The aim of this study was to identify and describe the most prominent and influential figures and organizational accounts to follow in radiology. METHODS: Influence scores for the topic "radiology" on Twitter (now known as X) were computed using the Right Relevance machine learning service. Top influencers were classified according to gender, geography, physician degree, areas of influence, subspecialization, influence score, title, affiliated institution, dual degree, medical school origin, content type, and research activity. Statistical analysis was performed assessing variable correlations. RESULTS: In the top quartile of influential figures, 87% were physicians, 60% men, and 93% located in the United States. Prevalent backgrounds included neuroradiology (21%), abdominal imaging (12%), and artificial intelligence (11%). Of the top 100 figures, 81% were US graduates, 97% held medical degrees, and 28% had dual degrees. Fifty-eight percent provided educational content. A majority held leadership positions (58%) and academic professorship titles (70%). The median h index, publication number, and citation number were 14, 49, and 881, respectively. No significant correlation was noted between influence score and academic rank or research output. CONCLUSIONS: Virtual presence is becoming integral to health care professions and academic spheres, unfolding great potential for enhancing the sense of belonging, advocacy, recruitment, and fostering new relationships. Having a core of influential leaders and organizations to follow can serve as a resource for the community members and aspiring students building a positive connected basis for radiology's thriving future.

Biotin-thiamine responsive basal ganglia disease: a retrospective review of the clinical, radiological and molecular findings of cases in Kuwait with novel variants.

BACKGROUND: Biotin-thiamine-responsive basal ganglia disease (BTBGD) is a rare autosomal recessive neurometabolic disorder that is caused by biallelic pathogenic SLC19A3 variants and is characterized by subacute encephalopathy associated with confusion, convulsions, dysphagia, dysarthria, or other neurological manifestations. METHODS: A retrospective review of the data registry in Kuwait Medical Genetics Center for all cases diagnosed clinically and radiographically and confirmed genetically with BTBGD. RESULTS: Twenty one cases from 13 different families were diagnosed with BTBGD in Kuwait. Most cases (86%) presented with confusion, dystonia, convulsions, or dysarthria, while three individuals were diagnosed pre-symptomatically during familial targeted genetic screening. Symptoms resolved completely within 2-week of treatment in two-thirds of the symptomatic cases but progressed in six of them to a variety of severe symptoms including severe cogwheel rigidity, dystonia and quadriparesis due to delayed presentation and management. Neuroradiological findings of the symptomatic cases revealed bilateral central changes in the basal ganglia. Two novel homozygous missense SLC19A3 variants were detected in a Kuwaiti and a Jordanian individuals, in addition to the previously reported Saudi founder homozygous variant, c.1264A > G; p.(Thr422Ala) in the remaining cases. Age of diagnosis ranged from newborn to 32 years, with a median age of 2-3 years. All cases are still alive receiving high doses of biotin and thiamine. CONCLUSION: This is the first study reporting the phenotypic and genotypic spectrum of 21 individuals with BTBGD in Kuwait and describing two novel SLC19A3 variants. BTBGD is a treatable neurometabolic disease that requires early recognition and treatment initiation. This study highlights the importance of performing targeted molecular testing of the founder variant in patients presenting with acute encephalopathy in the region.

Muslim Women and Disparities in Cancer Diagnosis: A Retrospective Study.

Muslim women often find their religious customs at odds with their healthcare needs, such as regular gynecological check-ups and cervical cancer screenings, especially before marriage. Religious beliefs may also affect beliefs about gender roles, illness, and death, affecting seeking healthcare services. This retrospective study explored the differences in care-seeking related to cancer between Muslim women and the general female population at the Virginia Commonwealth University in the United States between 2010 and 2019. There were major differences in insurance status between the two cohorts. Muslim women were less likely to have government-sponsored health insurance and were much more likely to be uninsured than non-Muslim women. We also found that preventable female cancers were more prevalent among Muslim women than among non-Muslim women and was also diagnosed at more advanced stages.

Early Diagnosis of Classic Homocystinuria in Kuwait through Newborn Screening: A 6-Year Experience.

Kuwait is a small Arabian Gulf country with a high rate of consanguinity and where a national newborn screening program was expanded in October 2014 to include a wide range of endocrine and metabolic disorders. A retrospective study conducted between January 2015 and December 2020 revealed a total of 304,086 newborns have been screened in Kuwait. Six newborns were diagnosed with classic homocystinuria with an incidence of 1:50,000, which is not as high as in Qatar but higher than the global incidence. Molecular testing for five of them has revealed three previously reported pathogenic variants in the CBS gene, c.969G>A, p.(Trp323Ter); c.982G>A, p.(Asp328Asn); and the Qatari founder variant c.1006C>T, p.(Arg336Cys). This is the first study to review the screening of newborns in Kuwait for classic homocystinuria, starting with the detection of elevated blood methionine and providing a follow-up strategy for positive results, including plasma total homocysteine and amino acid analyses. Further, we have demonstrated an increase in the specificity of the current newborn screening test for classic homocystinuria by including the methionine to phenylalanine ratio along with the elevated methionine blood levels in first-tier testing. Here, we provide evidence that the newborn screening in Kuwait has led to the early detection of classic homocystinuria cases and enabled the affected individuals to lead active and productive lives.

'Refeeding syndrome' in a Kuwaiti child: clinical diagnosis and management.

OBJECTIVE: To report a case of refeeding syndrome in a Kuwaiti child, its clinical presentation and management. CLINICAL PRESENTATION AND INTERVENTION: A 13-month-old Kuwaiti boy presented with acute severe malnutrition in the form of marasmic kwashiorkor. On admission, blood sugar and serum electrolytes were normal but on the 3rd day he developed typical biochemical features of refeeding syndrome in the form of hyperglycemia, severe hypophosphatemia, hypokalemia, hypocalcemia and hypomagnesemia. The child then received treatment appropriate for refeeding syndrome in the form of lower calorie intake with gradual increase, as well as supplementation of electrolytes, thiamine and vitamins and he eventually made a safe recovery. CONCLUSION: This case showed that during rehabilitation of a malnourished child, a severe potentially lethal electrolyte disturbance (refeeding syndrome) can occur. Careful monitoring of electrolytes before and during the refeeding phase was needed and helped to detect this syndrome early. We suggest that slow and gradual calorie increase in the 'at-risk' patient can help prevent its occurrence.

Classic galactosemia presenting with unilateral Peters' anomaly.

OBJECTIVE: To report a case of classic galactosemia that presented with a rare ocular finding, Peters' anomaly. CLINICAL PRESENTATION AND INTERVENTION: A neonate, born to first-degree healthy cousins, presented with persistent vomiting, failure to thrive, lethargy, and jaundice. Corneal opacity was noticed in the left eye. Hydration and empiric antibiotics were started after collection of the required blood work, which included both a septic and a metabolic workup. A deficiency in erythrocyte galactose-1-phosphate uridyltransferase was found, and this led to the diagnosis of classic galactosemia and the elimination of galactose from the diet. Furthermore, a diagnosis of left unilateral Peters' anomaly was made after examination by a pediatric ophthalmologist. The patient was discharged in stable condition and follow-up visits were scheduled with the metabolic clinic, a dietician, and the pediatric ophthalmologist. CONCLUSION: This was a case of classic galactosemia presenting with Peters' anomaly, probably due to autosomal recessive disorder from first-degree consanguinity marriage.

Association between circulating zinc/ferritin levels and parent Conner's scores in children with attention deficit hyperactivity disorder.

ADHD is one of the most common neurobehavioral disorders among children and adolescents. In this prospective study, we aimed to measure circulating zinc and ferritin levels in children with ADHD, pick up the deficient ones to give zinc and iron supplements then compare before and after treatment according to their Conner's scores and Wecsler IQ test. Current study included fifty children diagnosed as having ADHD by DSMV criteria, their zinc and ferritin levels were measured by Colorimetric method and enzyme-linked immunosorbent assay (ELISA) respectively. They were divided into: group I (zinc only deficient),group II (zinc and ferritin deficient),group III (non-deficient), cases with mineral deficiency received zinc (55 mg/day) and/or iron (6 mg/kg/day) for 6 months then reassessed by parent Conner's rating scale. In group 1, there was no significant difference between the Wecsler verbal and non-verbal IQ scores and oppositional and cognitive problems in Conner's scores before and after zinc supplements, although there was significant improvement in attention, hyperactivity, emotional liability and impulsivity. In group II, there was significant improvement in verbal and total IQ but not in performance IQ, also there was significant improvement in hyperactivity, emotional liability and impulsivity with no significant difference in oppositional, cognitive problems and inattention before and after zinc/ iron supplements. In Conclusion, Zinc supplements in adjuvant to the main treatment significantly improved symptoms of ADHD children. However, a combined zinc and iron supplements was superior to zinc alone in alleviating ADHD symptoms as well as IQ improvement.

Whole-exome sequencing gives additional benefits compared to candidate gene sequencing in the molecular diagnosis of children with growth hormone or IGF-1 insensitivity.

BACKGROUND: GH insensitivity (GHI) is characterised by short stature, IGF-1 deficiency and normal/elevated serum GH. IGF-1 insensitivity results in pre- and post-natal growth failure with normal/high IGF-1 levels. The prevalence of genetic defects is unknown. OBJECTIVE: To identify the underlying genetic diagnoses in a paediatric cohort with GH or IGF-1 insensitivity using candidate gene (CGS) and whole-exome sequencing (WES) and assess factors associated with the discovery of a genetic defect. METHODS: We undertook a prospective study of 132 patients with short stature and suspected GH or IGF-1 insensitivity referred to our centre for genetic analysis. 107 (96 GHI, 88 probands; 11 IGF-1 insensitivity, 9 probands) underwent CGS. WES was performed in those with no defined genetic aetiology following CGS. RESULTS: A genetic diagnosis was discovered 38/107 (36%) patients (32% probands) by CGS. WES revealed 11 patients with genetic variants in genes known to cause short stature. A further 2 patients had hypomethylation in the H19/IGF2 region or mUPD7 consistent with Silver-Russell Syndrome (total with genetic diagnosis 51/107, 48% or 41/97, 42% probands). WES also identified homozygous putative variants in FANCA and PHKB in 2 patients. Low height SDS and consanguinity were highly predictive for identifying a genetic defect. CONCLUSIONS: Comprehensive genetic testing confirms the genetic heterogeneity of GH/IGF-1 insensitivity and successfully identified the genetic aetiology in a significant proportion of cases. WES is rapid and may isolate genetic variants that have been missed by traditional clinically driven genetic testing. This emphasises the benefits of specialist diagnostic centres.

Ethylmalonic encephalopathy-report of two cases.

Ethylmalonic encephalopathy is a rare metabolic disease presenting in infancy with developmental delay, acrocyanosis, petechiae, chronic diarrhea and early death. The biochemical characteristics of this autosomal recessive disease are urinary organic acid abnormalities. Recently it has been found to be caused by mutations in the ETHE1 gene, located on Ch19q13. Only about 30 patients have been reported, and we describe two additional cases. The first patient showed a typical clinical picture and biochemical abnormalities, with additional atypical clinical features. Neuroimaging studies showed extensive changes. A new homozygous mutation in exon 3 of the ETHE1 gene was found. The second patient was not investigated genetically; however besides the typical clinical picture and biochemical profile he was found to have cytochrome C oxidase deficiency.

Liver disease and other comorbidities in Wolcott-Rallison syndrome: different phenotype and variable associations in a large cohort.

BACKGROUND: Wolcott-Rallison syndrome (WRS) is caused by recessive EIF2AK3 mutations and characterized by early-onset diabetes and skeletal dysplasia. Hepatic dysfunction has been reported in 60% of patients. AIMS: To describe a cohort of WRS patients and discuss the pattern and management of their liver disease. METHODS: Detailed phenotyping and direct sequencing of EIF2AK3 gene were conducted in all patients. RESULTS: Twenty-eight genetically confirmed patients (67% male; mean age 4.6 years) were identified. 17 different EIF2AK3 mutations were detected, of which 2 were novel. The p.S991N mutation was associated with prolonged survival and p.I650T with delayed onset. All patients presented before 25 months with diabetes with variation in the frequency and severity of 10 other features. Liver disease, first manifested as non-autoimmune hepatitis, was the commonest extra-pancreatic feature identified in 85.7% (24/28). 22/24 had at least one episode of acute hepatic failure which was the cause of death in all deceased patients (13/28). One child was treated by liver transplantation and had no liver disease and better diabetes control for the following 6 years. CONCLUSIONS: Liver disease in WRS is more frequent than previously described and carries high mortality. The first experience with liver transplantation in WRS is encouraging.

An early onset form of methylenetetrahydrofolate reductase deficiency: a report of a family from Kuwait.

Methylenetetrahydrofolate reductase deficiency (MTHFR) is a rare autosomal recessive disorder. There have been 68 cases reported to date in the literature [Eur J Pediatr 1998;157 (Suppl 2):S77]. It affects intracellular folate metabolism and results in homocystinuria and hypomethionemia. We report a family in which three children (two boys and one girl) died before the age of 3 months with severe MTHFR deficiency. A fourth affected boy was treated with betaine and he improved clinically and biochemically. We demonstrate the unique dermatological and brain imaging features in a kindred from Kuwait.

Infantile hyperinsulinism associated with enteropathy, deafness and renal tubulopathy: clinical manifestations of a syndrome caused by a contiguous gene deletion located on chromosome 11p.

We describe the clinical features of a new syndrome causing hyperinsulinism in infancy (HI), severe enteropathy, profound sensorineural deafness, and renal tubulopathy in three children born to two pairs of consanguineous parents. This combination of clinical features is explained by a 122-kb contiguous gene deletion on the short arm of chromosome 11. It deletes 22 of the 39 exons of the gene coding for the SUR1 component of the KATP channel on the pancreatic beta-cell thereby causing severe HI. It also deletes all but two of the 28 exons of the USH1C gene, which causes Usher syndrome and is important for the normal development and function of the ear and the eye, the gastrointestinal tract, and the kidney, thereby accounting for the symptoms of deafness, vestibular dysfunction and retinal dystrophy seen in type 1 Usher syndrome, diarrhoea, malabsorption, and tubulopathy. This contiguous gene deletion provides important insights into the normal development of several body organ systems.

Development, validation and application of tandem mass spectrometry for screening of inborn metabolic disorders in Kuwaiti infants.

OBJECTIVE: The aim of this work was to develop a specific and validated tandem mass spectrometric (MS/MS) method for screening of amino acidopathies, organic acidurias, urea cycle disorders and fatty acid oxidation defects in Kuwaiti newborns and sick infants. MATERIALS AND METHODS: A total of 1,520 blood samples were tested for inborn metabolic disorders in Kuwaiti newborns and sick infants. Positive electrospray MS/MS was used to measure diagnostic acylcarnitines and amino acids in blood spots after simple extraction and derivatization procedures. Validation and stability studies were conducted using control blood samples supplemented with known concentrations of the diagnostic amino acids or acylcarnitines. Reference and cutoff levels of the diagnostic metabolites were determined in a group of 500 normal Kuwaiti babies for quantitative evaluation. RESULTS: Of the 1,520 samples, 32 were positive newborn cases and 27 positive symptomatic infants. For the validation studies, the range of relative standard deviation was 2.6-14.7%, whereas the range of the percent deviation from nominal concentrations was -23.0 to +25.0 of the diagnostic metabolites. Stability studies indicated appropriate stability of the diagnostic amino acids and acylcarnitines in dried blood spots stored at 22 +/- 1 degrees C and relative humidity of 50-60%. CONCLUSIONS: Tandem mass spectrometry can significantly contribute to a newborn screening program as a fast and highly specific diagnostic technique for screening of a broad range of inborn metabolic disorders.

Acute pyelonephritis and renal scarring in Kuwaiti children: a follow-up study using 99mTc DMSA renal scintigraphy.

The aim of this study was to determine the prevalence of renal scarring in a group of Kuwaiti Arab children with their first documented acute pyelonephritis (APN). Eighty-two Kuwaiti Arab children (10 males and 72 females) who had abnormal (99m)Tc DMSA renal scan findings of acute pyelonephritis were prospectively studied with the same imaging modality 6 months after treatment to identify those who developed renal scarring. A micturition cystourethrogram (MCUG) was performed for all of the children 1 month after diagnosis. Children were divided into 3 age groups (<2 years, 2-5 years and above 5 years). The follow-up DMSA renal scans 6 months after diagnosis revealed normalization of renal changes in 56% (46 patients), much improvement with residual renal abnormality in 6% (5 patients), and persistent parenchymal defects in 38% (31 patients). Vesicoureteric reflux (VUR) was found in 32% of children (26/82) and the majority were between grade I and III. Thirteen of those with VUR (50%) developed renal scars on follow-up. Fifty-three percent of the scarred kidneys (19/36) were drained by non-refluxing ureters. In this study, children older than 2 years had less VUR yet were more susceptible to APN and to the development of renal scars. Girls were more prone to developing APN and renal scarring than boys. This work shows that APN is a serious cause for renal scarring in our patients, particularly if associated with other risk factors such as recurrent infections and the female sex.

Costello syndrome and hyperinsulinemic hypoglycemia.

Costello syndrome is characterized by mental retardation, loose skin, coarse facies, skeletal abnormalities, cardiovascular abnormalities (congenital heart defects, cardiomyopathy, rhythm disturbances), and predisposition to neoplasia. Endocrine abnormalities including growth hormone deficiency, adrenal insufficiency, glucose intolerance, parathyroid adenoma with hyperprolactinemia and hypoglycemia have been described. Hypoglycemia has been documented due to growth hormone and cortisol deficiency. We report on two patients with Costello syndrome and persistent hyperinsulinemic hypoglycemia and review the endocrine manifestations of Costello syndrome. Both patients required diazoxide therapy to stop the unregulated insulin secretion and maintain normoglycemia. The mechanism of persistent hyperinsulinism in patients with Costello syndrome is unclear.

Vesicoureteric reflux in Kuwaiti children with first febrile urinary tract infection.

The prevalence of vesicoureteric reflux (VUR) in children with urinary tract infection (UTI) varies among different racial groups. The purpose of this study was to determine the frequency of VUR and associated renal changes in a group of Arab Kuwaiti children with their first documented febrile UTI and to compare our findings with those reported from other racial groups. One hundred and seventy-four children (38 males and 136 females) fulfilled the study criteria and were divided into three age groups (<1 year, 1-5 years, and >5 years). Patients in each group had both micturating cystourethrography (MCUG) and 99m-Tc-dimercaptosuccinic acid (DMSA) renal scan after diagnosis. VUR was detected in 39 children (22%). Two-thirds of cases had mild reflux (grade I and II). Females ( n=32) had more reflux than males ( n=7) (24% vs. 18%). Sixty-three patients (36%) had abnormal (DMSA) renal scans (acute pyelonephritis [AP] or renal scars). Of these, 79% were children below 5 years. Abnormal DMSA scans were found in 4 of 38 males (11%) versus 59 of 136 females (43%). Abnormal scans in children with VUR were seen in 1 of 7 males (14%) versus 19 of 32 females (59%). In total, the combination of abnormal scan with VUR occurred in 1 of 38 males (3%) and in 19 of 136 females (14%), whereas abnormal scan without demonstrable VUR was seen in 3 of 38 males (8%) versus 40 of 136 females (29%). Our data showed that the frequency of VUR in Arab Kuwaiti children with febrile UTI is midway between Caucasian and other racial groups. In this study, males had a lower-risk profile than females, the latter having a higher rate of reflux as well as a higher rate of abnormal DMSA scans, irrespective of demonstrable VUR.