Search

Background: The primary features of Bardet Biedl syndrome (BBS) are characterized by retinal degeneration, central obesity, post-axial polydactyly, intellectual impairment, hypogonadism, and renal anomalies. The secondary clinical features are syndactyly, delay in the achievement of developmental milestones, diabetes insipidus, diabetes mellitus, congenital heart disease and liver involvement. It is diagnosed when a patient has either four primary or three primary and two secondary clinical features and the management depends upon those predominant features. Case presentation: A 12-year-old boy presented with polyuria, polydipsia and polyphagia. His developmental milestones were delayed and had syndromic features on physical exmination. Ultrasound of the abdomen and pelvis showed mild right-side hydronephrosis. His BMI was 28 and HbA1c was 18.3%, and values of LH and FSH were decreased. As a result, he was diagnosed with a case of BBS. He was commenced on insulin therapy with Insulin Regular (Human Insulin)and Insulin NPH (Human Insulin). Conclusion: Patients presenting with polyuria, polydipsia, polyphagia along with the presence of syndromic features, should be assessed for BBS as osmotic symptoms associated with diabetes mellitus can be initial clinical presentation of BBS. Its management depends upon the signs and symptoms of the patient. Various options including weight loss, exercise, oral hypoglycemic drugs, and insulin are available to treat diabetes mellitus in BBS. Some cases can have very high levels of HbA1c on initial presentation, which may require insulin without trying oral hypoglycemic drugs to treat diabetes mellitus in BBS.

PurposeTo illustrate the importance of systemic evaluation in retinal dystrophies through examples of Alstrom syndrome, Bardet Biedl syndrome, and Refsum disease.ObservationsDetailed eye evaluations, including visual acuity, visual field, slit lamp examination, and indirect ophthalmoscopy were performed. Retinal imaging included fundus photography and spectral domain optical coherence tomography (SD-OCT). Functional testing of the retina was done using full field electroretinography (ffERG). In addition, molecular genetic testing was performed using a ciliopathy panel, a retinal dystrophy panel, and whole genome sequencing (WGS).We report three individuals who presented with vision concerns first to ophthalmology, noted to have retinal dystrophy, and then referred to genomic medicine for genetic testing. Additional evaluation led to suspicion of specific groups of systemic disorders and guided appropriate genetic testing. The first individual presented with retinal dystrophy, obesity, and short stature with no reported neurocognitive deficits. Genetic testing included a ciliopathy panel that was negative followed by WGS that identified biallelic variants in ALMS: a novel frame-shift pathogenic variant c.6525dupT (p.Gln2176Serfs*17) and a rare nonsense pathogenic variant c.2035C > T (p.Arg679Ter) consistent with Alstrom syndrome. The second individual presented with retinal dystrophy, central obesity, and mild neurocognitive deficits. A ciliopathy genetic testing panel identified a homozygous pathogenic variant in BBS7: c.389_390del (p.Asn130Thrfs*4), confirming the diagnosis of Bardet Biedl syndrome. The third individual presented with progressive vision loss due to retinitis pigmentosa, anosmia, hearing loss, and shortened metatarsals and digits. Genetic testing identified two variants in PHYH: c.375_375del (p.Glu126Argfs*2) a pathogenic variant and c.536A > G (p.His179Arg), a variant of uncertain significance (VUS), suggestive of Refsum disease. Additional biochemical testing revealed markedly elevated phytanic acid with a low concentration of pristanic acid and normal concentrations of very long-chain fatty acids (C22:0, C24:0, C26:0), a pattern consistent with a diagnosis of Refsum disease.Conclusions and importanceIn individuals who present with retinal dystrophy to ophthalmologists, additional systemic manifestations such as sensorineural hearing loss, anosmia, or polydactyly, should be sought and a positive history or examination finding should prompt an immediate referral to a clinical geneticist for additional evaluation and appropriate genetic testing. This facilitates pre-test genetic counseling and allows for more accurate diagnosis, prognosis, and management of affected individuals along with better recurrence risk estimates for family members. Identification of an underlying etiology also enhances the understanding of the pathophysiology of disease and expands the genotypic and phenotypic spectrum. Ultimately, successful recognition of these diseases facilitates development of targeted therapies and surveillance of affected individuals.

PurposeThe purpose of this study was to compare the natural history of visual function change in cohorts of patients affected with retinal degeneration due to biallelic variants in Bardet-Biedl syndrome genes: BBS1 and BBS10.MethodsPatients were recruited from nine academic centers from six countries (Belgium, Canada, France, New Zealand, Switzerland, and the United States). Inclusion criteria were: (1) female or male patients with a clinical diagnosis of retinal dystrophy, (2) biallelic disease-causing variants in BBS1 or BBS10, and (3) measures of visual function for at least one visit. Retrospective data collected included genotypes, age, onset of symptoms, and best corrected visual acuity (VA). When possible, data on refractive error, fundus images and autofluorescence (FAF), optical coherence tomography (OCT), Goldmann kinetic perimetry (VF), electroretinography (ERG), and the systemic phenotype were collected.ResultsSixty-seven individuals had variants in BBS1 (n = 38; 20 female patients and 18 male patients); or BBS10 (n = 29; 14 female patients and 15 male patients). Missense variants were the most common type of variants for patients with BBS1, whereas frameshift variants were most common for BBS10. When ERGs were recordable, rod-cone dystrophy (RCD) was observed in 82% (23/28) of patients with BBS1 and 73% (8/11) of patients with BBS10; cone-rod dystrophy (CORD) was seen in 18% of patients with BBS1 only, and cone dystrophy (COD) was only seen in 3 patients with BBS10 (27%). ERGs were nondetectable earlier in patients with BBS10 than in patients with BBS1. Similarly, VA and VF declined more rapidly in patients with BBS10 compared to patients with BBS1.ConclusionsRetinal degeneration appears earlier and is more severe in BBS10 cases as compared to those with BBS1 variants. The course of change of visual function appears to relate to genetic subtypes of BBS.

Purpose: Gene therapy actually seems to have promising results in the treatment of Leber Congenital Amaurosis and some different inherited retinal diseases (IRDs); the primary goal of this strategy is to change gene defects with a wild-type gene without defects in a DNA sequence to achieve partial recovery of the photoreceptor function and, consequently, partially restore lost retinal functions. This approach led to the introduction of a new drug (voretigene neparvovec-rzyl) for replacement of the RPE65 gene in patients affected by Leber Congenital Amaurosis (LCA); however, the treatment results are inconstant and with variable long-lasting effects due to a lack of correctly evaluating the anatomical and functional conditions of residual photoreceptors. These variabilities may also be related to host immunoreactive reactions towards the Adenovirus-associated vector. A broad spectrum of retinal dystrophies frequently generates doubt as to whether the disease or the patient is a good candidate for a successful gene treatment, because, very often, different diseases share similar genetic characteristics, causing an inconstant genotype/phenotype correlation between clinical characteristics also within the same family. For example, mutations on the RPE65 gene cause Leber Congenital Amaurosis (LCA) but also some forms of Retinitis Pigmentosa (RP), Bardet Biedl Syndrome (BBS), Congenital Stationary Night Blindness (CSNB) and Usher syndrome (USH), with a very wide spectrum of clinical manifestations. These confusing elements are due to the different pathways in which the product protein (retinoid isomer-hydrolase) is involved and, consequently, the overlapping metabolism in retinal function. Considering this point and the cost of the drug (over USD one hundred thousand), it would be mandatory to follow guidelines or algorithms to assess the best-fitting disease and candidate patients to maximize the output. Unfortunately, at the moment, there are no suggestions regarding who to treat with gene therapy. Moreover, gene therapy might be helpful in other forms of inherited retinal dystrophies, with more frequent incidence of the disease and better functional conditions (actually, gene therapy is proposed only for patients with poor vision, considering possible side effects due to the treatment procedures), in which this approach leads to better function and, hopefully, visual restoration. But, in this view, who might be a disease candidate or patient to undergo gene therapy, in relationship to the onset of clinical trials for several different forms of IRD? Further, what is the gold standard for tests able to correctly select the patient? Our work aims to evaluate clinical considerations on instrumental morphofunctional tests to assess candidate subjects for treatment and correlate them with clinical and genetic defect analysis that, often, is not correspondent. We try to define which parameters are an essential and indispensable part of the clinical rationale to select patients with IRDs for gene therapy. This review will describe a series of models used to characterize retinal morphology and function from tests, such as optical coherence tomography (OCT) and electrophysiological evaluation (ERG), and its evaluation as a primary outcome in clinical trials. A secondary aim is to propose an ancillary clinical classification of IRDs and their accessibility based on gene therapy's current state of the art. Material and Methods: OCT, ERG, and visual field examinations were performed in different forms of IRDs, classified based on clinical and retinal conditions; compared to the gene defect classification, we utilized a diagnostic algorithm for the clinical classification based on morphofunctional information of the retina of patients, which could significantly improve diagnostic accuracy and, consequently, help the ophthalmologist to make a correct diagnosis to achieve optimal clinical results. These considerations are very helpful in selecting IRD patients who might respond to gene therapy with possible therapeutic success and filter out those in which treatment has a lower chance or no chance of positive results due to bad retinal conditions, avoiding time-consuming patient management with unsatisfactory results. [ABSTRACT FROM AUTHOR]

Bardet Biedl syndrome (BBS) is a rare primary ciliopathy with a complex and extremely variable clinical presentation. The core features of the disease are rod-cone dystrophy, postaxial polydactyly, central obesity, urogenital anomalies, learning difficulties and kidney disease, however the impairment of any organ may complicate the clinical picture. Here we report on clinical findings of 25 patients diagnosed with BBS. Our study is the first on a cohort of Romanian BBS patients, aiming to emphasize the complexity of the disease that may have a devastating impact on patients and their families. Thus, an early clinical diagnosis is crucial for anticipation of other system and organ involvement. Periodic follow up, by a multidisciplinary team, may prevent several severe complications, which could accelerate or aggravate the most deleterious aspects of the disease: loss of vision or renal impairment.

Cilium is a highly conserved antenna-like structure protruding from the surface of the cell membrane, which is widely distributed on most mammalian cells. Two types of cilia have been described so far which include motile cilia and immotile cilia and the latter are also known as primary cilia. Dysfunctional primary cilia are commonly associated with a variety of congenital diseases called ciliopathies with multifaceted presentations such as retinopathy, congenital kidney disease, intellectual disability, cancer, polycystic kidney, obesity, Bardet Biedl syndrome (BBS), etc. Intraflagellar transport (IFT) is a bi-directional transportation process that helps maintain a balanced flow of proteins or signaling molecules essential for the communication between cilia and cytoplasm. Disrupted IFT contributes to the abnormal structure or function of cilia and frequently promotes the occurrence of ciliopathies. Intraflagellar transport 172 (IFT172) is a newly identified member of IFT proteins closely involved in some rare ciliopathies such as Mainzer-Saldino syndrome (MZSDS) and BBS, though the underpinning causal mechanisms remain largely elusive. In this review, we summarize the key findings on the genetic and protein characteristic of IFT172, as well as its function in intraflagellar transport, to provide comprehensive insights to understand IFT172-related ciliopathies.

The Bardet–Biedl syndrome (BBS) is a rare ciliopathic autosomal-recessive disorder, with multiple organ systems involvement. It is usually seen in family with consanguinous marriage. It is characterized by truncal obesity, polydactyly, retinal dystrophy, mental retardation, renal dysfunction and hypogonadism in males. It affects both males and females. Very few cases are reported in Nepal. Here we report a 30 year obese lady who presented to our center with history of excessive weight gain and blindness with polydactyly. She visited many local medical centers before landing to our hospital.

Purpose: To illustrate the importance of systemic evaluation in retinal dystrophies through examples of Alstrom syndrome, Bardet Biedl syndrome, and Refsum disease. Observations: Detailed eye evaluations, including visual acuity, visual field, slit lamp examination, and indirect ophthalmoscopy were performed. Retinal imaging included fundus photography and spectral domain optical coherence tomography (SD-OCT). Functional testing of the retina was done using full field electroretinography (ffERG). In addition, molecular genetic testing was performed using a ciliopathy panel, a retinal dystrophy panel, and whole genome sequencing (WGS).We report three individuals who presented with vision concerns first to ophthalmology, noted to have retinal dystrophy, and then referred to genomic medicine for genetic testing. Additional evaluation led to suspicion of specific groups of systemic disorders and guided appropriate genetic testing. The first individual presented with retinal dystrophy, obesity, and short stature with no reported neurocognitive deficits. Genetic testing included a ciliopathy panel that was negative followed by WGS that identified biallelic variants in ALMS: a novel frame-shift pathogenic variant c.6525dupT (p.Gln2176Serfs*17) and a rare nonsense pathogenic variant c.2035C > T (p.Arg679Ter) consistent with Alstrom syndrome. The second individual presented with retinal dystrophy, central obesity, and mild neurocognitive deficits. A ciliopathy genetic testing panel identified a homozygous pathogenic variant in BBS7: c.389_390del (p.Asn130Thrfs*4), confirming the diagnosis of Bardet Biedl syndrome. The third individual presented with progressive vision loss due to retinitis pigmentosa, anosmia, hearing loss, and shortened metatarsals and digits. Genetic testing identified two variants in PHYH: c.375_375del (p.Glu126Argfs*2) a pathogenic variant and c.536A > G (p.His179Arg), a variant of uncertain significance (VUS), suggestive of Refsum disease. Additional biochemical testing revealed markedly elevated phytanic acid with a low concentration of pristanic acid and normal concentrations of very long-chain fatty acids (C22:0, C24:0, C26:0), a pattern consistent with a diagnosis of Refsum disease. Conclusions and importance: In individuals who present with retinal dystrophy to ophthalmologists, additional systemic manifestations such as sensorineural hearing loss, anosmia, or polydactyly, should be sought and a positive history or examination finding should prompt an immediate referral to a clinical geneticist for additional evaluation and appropriate genetic testing. This facilitates pre-test genetic counseling and allows for more accurate diagnosis, prognosis, and management of affected individuals along with better recurrence risk estimates for family members. Identification of an underlying etiology also enhances the understanding of the pathophysiology of disease and expands the genotypic and phenotypic spectrum. Ultimately, successful recognition of these diseases facilitates development of targeted therapies and surveillance of affected individuals.

Bardet Biedl syndrome (BBS) is a rare primary ciliopathy with a complex and extremely variable clinical presentation. The core features of the disease are rod-cone dystrophy, postaxial polydactyly, central obesity, urogenital anomalies, learning difficulties and kidney disease, however the impairment of any organ may complicate the clinical picture. Here we report on clinical findings of 25 patients diagnosed with BBS. Our study is the first on a cohort of Romanian BBS patients, aiming to emphasize the complexity of the disease that may have a devastating impact on patients and their families. Thus, an early clinical diagnosis is crucial for anticipation of other system and organ involvement. Periodic follow up, by a multidisciplinary team, may prevent several severe complications, which could accelerate or aggravate the most deleterious aspects of the disease: loss of vision or renal impairment. [ABSTRACT FROM AUTHOR]

Introduction: Primary cilia are hair-like solitary organelles growing on most mammalian cells that play fundamental roles in embryonic patterning and organogenesis. Defective cilia often cause a suite of inherited diseases called ciliopathies with multifaceted manifestations. Intraflagellar transport (IFT), a bidirectional protein trafficking along the cilium, actively facilitates the formation and absorption of primary cilia. IFT172 is the largest component of the IFT-B complex, and its roles in Bardet-Biedl Syndrome (BBS) have been appreciated with unclear mechanisms., Objectives: We performed a battery of behavioral tests with Ift172 haploinsufficiency (Ift172 +/- ) and WT littermates. We use RNA sequencing to identify the genes and signaling pathways that are differentially expressed and enriched in the hippocampus of Ift172 +/- mice. Using AAV-mediated sparse labeling, electron microscopic examination, patch clamp and local field potential recording, western blot, luciferase reporter assay, chromatin immunoprecipitation, and neuropharmacological approach, we investigated the underlying mechanisms for the aberrant phenotypes presented by Ift172 +/- mice., Results: Ift172 +/- mice displayed excessive self-grooming, elevated anxiety, and impaired cognition. RNA sequencing revealed enrichment of differentially expressed genes in pathways relevant to axonogenesis and synaptic plasticity, which were further confirmed by less spine density and synaptic number. Ift172 +/- mice demonstrated fewer parvalbumin-expressing neurons, decreased inhibitory synaptic transmission, augmented theta oscillation, and sharp-wave ripples in the CA1 region. Moreover, Ift172 haploinsufficiency caused less BDNF production and less activated BDNF-TrkB signaling pathway through transcription factor Gli3. Application of 7,8-Dihydroxyflavone, a potent small molecular TrkB agonist, fully restored BDNF-TrkB signaling activity and abnormal behavioral phenotypes presented by Ift172 +/- mice. With luciferase and chip assays, we provided further evidence that Gli3 may physically interact with BDNF promoter I and regulate BDNF expression., Conclusions: Our data suggest that Ift172 per se drives neurotrophic effects and, when defective, could cause neurodevelopmental disorders reminiscent of autism-like disorders., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024. Production and hosting by Elsevier B.V.)

The Bardet-Biedl syndrome (BBS) is a rare ciliopathic autosomal-recessive disorder, with multiple organ systems involved. It is usually seen in families with consanguineous marriage. It is characterized by truncal obesity, polydactyly, retinal dystrophy, mental retardation, renal dysfunction and hypogonadism in males. It affects both males and females. Very few cases are reported in Nepal. Here we report a 30-year obese lady who presented to our center with history of excessive weight gain and blindness with polydactyly. She visited many local medical centers before landing at our hospital. [ABSTRACT FROM AUTHOR]

Purpose: To present the case of two siblings with a genetic diagnosis of Bardet Biedl syndrome (BBS) type 1, yet different clinical profiles and disease manifestations. Observations: Sequencing analysis revealed a p.Met390Arg pathogenic variant in the BBS1 gene of both patients, as well as several additional variants of uncertain significance Patient 1 was 41 years old, had three primary (cone-rod dystrophy, hypogonadism, and truncal obesity) and three secondary (arterial hypertension, strabismus, and astigmatism) BBS features. He also had insulin resistance, as well as low levels of total testosterone and cortisol. Patient 2 was 43 years old, had two primary (cone-rod dystrophy and truncal obesity), and four secondary (arterial hypertension, diabetes mellitus, strabismus, and astigmatism) BBS features. Both patients had severe maculopathy; however, patient 1 had bone-spicules that extended up to the mid-periphery, in a perivenular pattern, and significant vascular attenuation with “ghost vessel” appearance towards the temporal periphery, a feature that was absent on patient 2. Conclusions and Importance: The intrafamilial phenotypic variability among our patients supports the hypothesis that BBS is a disease with genetic, hormonal, and environmental triggers interacting to produce phenotypic variability. Although our report may not establish a definite relationship between environmental and genetic influences, their role should be explored in future studies.

Purpose: Bardet-Biedl syndrome (BBS) is a ciliopathy with a wide spectrum of symptoms due to primary cilia dysfunction, including genitourinary developmental anomalies as well as impaired reproduction, particularly in males. Primary cilia are known to be required at the following steps of reproduction function: (i) genitourinary organogenesis, (ii) in fetal firing of hypothalamo-pituitary axe, (iii) sperm flagellum structure, and (iv) first zygotic mitosis conducted by proximal sperm centriole. BBS phenotype is not fully understood.Methods: This study explored all steps of reproduction in 11 French male patients with identified BBS mutations.Results: BBS patients frequently presented with genitourinary malformations, such as cryptorchidism (5/11), short scrotum (5/8), and micropenis (5/8), but unexpectedly, with normal testis size (7/8). Ultrasonography highlighted epididymal cysts or agenesis of one seminal vesicle in some cases. Sexual hormones levels were normal in all patients except one. Sperm numeration was normal in 8 out of the 10 obtained samples. Five to 45% of sperm presented a progressive motility. Electron microscopy analysis of spermatozoa did not reveal any homogeneous abnormality. Moreover, a psychological approach pointed to a decreased self-confidence linked to blindness and obesity explaining why so few BBS patients express a child wish.Conclusions: Primary cilia dysfunction in BBS impacts the embryology of the male genital tract, especially epididymis, penis, and scrotum through an insufficient fetal androgen production. However, in adults, sperm structure does not seem to be impacted. These results should be confirmed in a greater BBS patient cohort, focusing on fertility. [ABSTRACT FROM AUTHOR]

Barded-Biedl syndrome (BBS) is a rare genetic disorder with an unmet medical need for retinal degeneration. Small-molecule drugs were previously identified to slow down the apoptosis of photoreceptors in BBS mouse models. Clinical translation was not practical due to the necessity of repetitive invasive intravitreal injections for pediatric populations. Non-invasive methods of retinal drug targeting are a prerequisite for acceptable adaptation to the targeted pediatric patient population. Here, we present the development and functional testing of a non-invasive, topical, magnetically assisted delivery system, harnessing the ability of magnetic nanoparticles (MNPs) to cargo two drugs (guanabenz and valproic acid) with anti-unfolded protein response (UPR) properties towards the retina. Using magnetic resonance imaging (MRI), we showed the MNPs’ presence in the retina of Bbs wild-type mice, and their photoreceptor localization was validated using transmission electron microscopy (TEM). Subsequent electroretinogram recordings (ERGs) demonstrated that we achieved beneficial biological effects with the magnetically assisted treatment translating the maintained light detection in Bbs−/− mice (KO). To our knowledge, this is the first demonstration of efficient magnetic drug targeting in the photoreceptors in vivo after topical administration. This non-invasive, needle-free technology expands the application of SMDs for the treatment of a vast spectrum of retinal degenerations and other ocular diseases.

The risk for metabolic and cardiovascular complications of obesity is defined by body fat distribution rather than global adiposity. Unlike subcutaneous fat, visceral fat (including hepatic steatosis) reflects insulin resistance and predicts type 2 diabetes and cardiovascular disease. In humans, available evidence indicates that the ability to store triglycerides in the subcutaneous adipose tissue reflects enhanced insulin sensitivity. Prospective studies document an association between larger subcutaneous fat mass at baseline and reduced incidence of impaired glucose tolerance. Case-control studies reveal an association between genetic predisposition to insulin resistance and a lower amount of subcutaneous adipose tissue. Human peroxisome proliferator-activated receptorgamma (PPAR-γ) promotes subcutaneous adipocyte differentiation and subcutaneous fat deposition, improving insulin resistance and reducing visceral fat. Thiazolidinediones reproduce the effects of PPAR-γ activation and therefore increase the amount of subcutaneous fat while enhancing insulin sensitivity and reducing visceral fat. Partial or virtually complete lack of adipose tissue (lipodystrophy) is associated with insulin resistance and its clinical manifestations, including essential hypertension, hypertriglyceridemia, reduced HDL-c, type 2 diabetes, cardiovascular disease, and kidney disease. Patients with Prader Willi syndrome manifest severe subcutaneous obesity without insulin resistance. The impaired ability to accumulate fat in the subcutaneous adipose tissue may be due to deficient triglyceride synthesis, inadequate formation of lipid droplets, or defective adipocyte differentiation. Lean and obese humans develop insulin resistance when the capacity to store fat in the subcutaneous adipose tissue is exhausted and deposition of triglycerides is no longer attainable at that location. Existing adipocytes become large and reflect the presence of insulin resistance., (Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.)

Bardet Biedl syndrome (BBS), is a multisystemic disorder which is described as a ciliopathy. BBS is a rare autosomal recessive disorder and 21 different BBS genes have been defined to date. BBS is characterized with dysmorphic extremities, retinitis pigmentosa, obesity, hypogenitalism, intellectual disabilility and renal structural abnormalities. Renal symptoms in patients with BBS, are nonspecific and often undetected until end-stage renal disease. Here, we were reported 23 children with BBS (12 females, 11 males) with renal abnormalities from a single center and defined their features. Age at diagnosis were very variable (2 days-16 years). Median age at diagnosis was 84 months. Mean follow-up period was 42 months. All 23 children had urinary tract abnormalities on renal ultrasonography. These abnormalities were polycysts (34.8%), hyperechogenic kidneys (34.8%), fetal lobulation (21.7%), hypoplasia on at least one kidney (21.7%) and hydronephrosis in at least one kidney (17.4%). Vesicoureteral reflux and neurogenic bladder detected 11.1% and 22.2% of patients who recieved a voiding cystourethrogram, respectively. Proteinuria was found in 39% of patients. Hypertension was defined in 21.7% of patients. Six of 23 children (26%) in our cohort had proven mutations in BBS genes. Five of them (83.3%) had homozygous mutations in BBS10 gene and one of them had homozygous mutation in BBS2 gene. All of 23 children had retinitis pigmentosa, twenty two of them (95.6%) had learning disabilities/cognitive impairment and seventeen of them (82.6%) had obesity. Renal involvement is now accepted as a cardinal feature and the most important factor causing mortality in BBS. [ABSTRACT FROM AUTHOR]

Bardet Biedl Syndrome is a autosomal recessive condition with a wide spectrum of clinical features. The principal manifestations of the syndrome are Post axial Polydactyly, Retinitis Pigmentosa, truncal obesity, hypogonadism & renal dysfunction. The authors report a case of Bardet Biedl Syndrome in a young girl diagnosed on the basis of post axial Polydactyly, retinitis pigmentosa and other systemic features. Postaxial Polydactyly is one of the earliest and most common manifestation of Bardet Biedl syndrome, followed by truncal obesity and retinitis pigmentosa. Renal failure is the major cause of morbidity and mortality. The importance of Polydactyly lies in the fact that, such finding can be helpful in antenatal diagnosis to see its inheritance, counseling of such families and at times may be treated by surgical correction.

Bardet Biedl syndrome is a rare autosomal recessive disorder with variable clinical presentation and challenging diagnosis. Recognition of orofacial features might help in the diagnosis. Dental management of affected patients might be complicated by renal, cardiac, metabolic, neurosensory, and cognitive defects. [ABSTRACT FROM AUTHOR]

Bardet Biedl Syndrome (BBS) is a rare idiopathic autosomal recessive disorder which affects multiple organs and organ systems. In India less than 15 cases have been reported so far. We present case of 41 year old third gravida who presented at 17 weeks of gestation. She had a suspicious history of delayed milestones in the previous child and ultrasound findings of echogenic kidneys, bilateral talipes, and polydactyly. Index child evaluation showed type-6 variant of BBS. Amniocentesis in the present pregnancy showed the same mutation in the fetus. The couple decided on termination of t pregnancy. [ABSTRACT FROM AUTHOR]

Cilium is a highly conserved antenna-like structure protruding from the surface of the cell membrane, which is widely distributed on most mammalian cells. Two types of cilia have been described so far which include motile cilia and immotile cilia and the latter are also known as primary cilia. Dysfunctional primary cilia are commonly associated with a variety of congenital diseases called ciliopathies with multifaceted presentations such as retinopathy, congenital kidney disease, intellectual disability, cancer, polycystic kidney, obesity, Bardet Biedl syndrome (BBS), etc. Intraflagellar transport (IFT) is a bi-directional transportation process that helps maintain a balanced flow of proteins or signaling molecules essential for the communication between cilia and cytoplasm. Disrupted IFT contributes to the abnormal structure or function of cilia and frequently promotes the occurrence of ciliopathies. Intraflagellar transport 172 (IFT172) is a newly identified member of IFT proteins closely involved in some rare ciliopathies such as Mainzer-Saldino syndrome (MZSDS) and BBS, though the underpinning causal mechanisms remain largely elusive. In this review, we summarize the key findings on the genetic and protein characteristic of IFT172, as well as its function in intraflagellar transport, to provide comprehensive insights to understand IFT172-related ciliopathies., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Zheng, Miao, Zhang, Huang, Jahangir, Luo and Lang.)

Background: Bardet-Biedl syndrome (BBS) is a multisystem genetic disorder characterized with central obesity, pigmentary retinopathy, polydactyly, mental retardation, and hypogenitalism. Renal abnormalities have been recognized as a cardinal feature of the disease with serious prognostic implication. The aim of this study was to analyze the renal status in children with BBS and to implement appropriate interventions in those with progressive course Patients and methods: The diagnosis of BBS was established on the basis of criteria proposed by Beales et al. (J Med Genet 1999). Imaging of the kidneys and urinary tract was performed with ultrasound study, Tc99m DMSA scan and a cystographic study. Twenty four hour urine collections were obtained for estimation of proteinuria and creatinine clearance. Blood pressure was monitored at clinical visits or as 24-hour ambulatory monitoring. Results: There were 4 children (2 males, 2 females). All four children displayed abnormal kidney ultrasound and Tc99m DMSA scan resembling dysplastic kidney(s). Two of them had overt proteinuria (glomerulo-tubular pattern). Three children had normal blood pressure and glomerular filtration rate (GFR): 107, 145 and 95 ml/min/1.73m², and the fourth had hypertension and progressive worsening of the GFR at 65 ml/min/1.73m². Conclusion: Children with BBS should undergo imaging studies of the kidneys and urinary tract at initial work up; in those with renal dysplasia proteinuria, GFR and blood pressure should be regularly monitored to slow down progression to terminal renal failure. [ABSTRACT FROM AUTHOR]

Duane′s retraction syndrome (DRS) includes changes in palpebral fissure width along with restriction of ocular motility. Bardet Biedl syndrome (BBS) includes presence of retinitis pigmentosa (RP) with obesity, mental retardation, polydactyly and renal abnormalities. We report a case of rare association of DRS with BBS in a seven-year-old child. The ocular motility examination revealed left DRS with esotropia. Fundus examination revealed findings characteristic of an atypical retinitis pigmentosa. The electro-retinogram waveforms were extinguished both for rods and cones. He was diagnosed as a case of BBS on the basis of the ophthalmological findings plus association with the systemic features of obesity, polydactyly, hypogonadism, mental retardation and renal abnormalities. This case gives further evidence of the fact that BBS may be associated with abnormalities of eye movements.

Introduction: Bardet Biedl syndrome is a rare hereditary disorder associated with central obesity, mental retardation, polydactyly, retinal dystrophy, retinitis pigmentosa, hypogenitlism, hypogonadism, renal failure. Renal failure is a major cause of mortality in these patients. This report highlights the clinical importance of considering a Bardet Biedl syndrome diagnosis in adults with retinal dystrophy, polydactyly and renal failure. Case Report: we present the case of a 32 yr old woman presented to our emergency room with uremic symptoms and metabolic acidosis. Conclusion: Bardet Biedl syndrome, a rare often forgotten or not been diagnosed disorder, should be promptly identified by pediatricians and timely be referred to the ophtalmologist, endocrinologist, and nephrologist. [ABSTRACT FROM AUTHOR]

Bardet Biedl Syndrome (BBS) is a rare idiopathic autosomal recessive disorder which affects multiple organs and organ systems. In India less than 15 cases have been reported so far. We present case of 41 year old third gravida who presented at 17 weeks of gestation. She had a suspicious history of delayed milestones in the previous child and ultrasound findings of echogenic kidneys, bilateral talipes, and polydactyly. Index child evaluation showed type-6 variant of BBS. Amniocentesis in the present pregnancy showed the same mutation in the fetus. The couple decided on termination of t pregnancy. [ABSTRACT FROM AUTHOR]

Bardet-Biedl Syndrome (BBS) is a pleiotropic and genetically heterozygous disorder caused independently by numerous genes (BBS1- BBS17). Seven highly conserved BBS proteins (BBS1, 2, 4, 5, 7, 8 and 9) form a complex known as the BBSome, which functions in ciliary membrane biogenesis. BBS7 is both a unique subunit of the BBSome and displays direct physical interaction with a second BBS complex, the BBS chaperonin complex. To examine the in vivo function of BBS7, we generated Bbs7 knockout mice. Bbs7-/- mice show similar phenotypes to other BBS gene mutant mice including retinal degeneration, obesity, ventriculomegaly and male infertility characterized by abnormal spermatozoa flagellar axonemes. Using tissues from Bbs7-/- mice, we show that BBS7 is required for BBSome formation, and that BBS7 and BBS2 depend on each other for protein stability. Although the BBSome serves as a coat complex for ciliary membrane proteins, BBS7 is not required for the localization of ciliary membrane proteins polycystin-1, polycystin-2, or bitter taste receptors, but absence of BBS7 leads to abnormal accumulation of the dopamine D1 receptor to the ciliary membrane, indicating that BBS7 is involved in specific membrane protein localization to cilia. [ABSTRACT FROM AUTHOR]

Bardet Biedl syndrome (BBS) is a rare autosomal recessive disease, characterized by clinical and genetic heterogeneity. Many genes are involved. BBS seems to be different from Lawrence Moon BBS, although they share some clinical symptoms. The main clinical signs are obesity, pigmentary retinopathy, kidney malformations, and hypogenitalism. Our aim is to report a case with typical retinis pigmentosa, hypergonadotrophic hypogonadism and cerebellum cyst. Case report. A man aged 18 was referred for obesity and blindness. His family history was marked by obesity and diabetes mellitus type II. His medical history began very soon, as he was born with polydactyly, then he became obese and had difficulty to learn and to see. His blindness was progressive, and his puberty was delayed. Clinical and biological exams showed: severe android obesity (BMI = 40kg/m², waist circumference = 130cm), pigmentary retinopathy, small testes with high FSH = 17 mU/mL (1-8), and normal LH = 6.13 mU/mL (0.6-12)], empty sellae, cerebellum cyst, renal malformations, and signs of chronic infections. He did not have any spasticity or ataxia. Genetic study was not done. Conclusion. In this case, all features argued for typical BBS, except for testicular insufficiency which is classically described as hypogonadotrophic. Infections should be treated vigorously to avoid renal insufficiency. [ABSTRACT FROM AUTHOR]

Barded-Biedl syndrome (BBS) is a rare genetic disorder with an unmet medical need for retinal degeneration. Small-molecule drugs were previously identified to slow down the apoptosis of photoreceptors in BBS mouse models. Clinical translation was not practical due to the necessity of repetitive invasive intravitreal injections for pediatric populations. Non-invasive methods of retinal drug targeting are a prerequisite for acceptable adaptation to the targeted pediatric patient population. Here, we present the development and functional testing of a non-invasive, topical, magnetically assisted delivery system, harnessing the ability of magnetic nanoparticles (MNPs) to cargo two drugs (guanabenz and valproic acid) with anti-unfolded protein response (UPR) properties towards the retina. Using magnetic resonance imaging (MRI), we showed the MNPs' presence in the retina of Bbs wild-type mice, and their photoreceptor localization was validated using transmission electron microscopy (TEM). Subsequent electroretinogram recordings (ERGs) demonstrated that we achieved beneficial biological effects with the magnetically assisted treatment translating the maintained light detection in Bbs−/− mice (KO). To our knowledge, this is the first demonstration of efficient magnetic drug targeting in the photoreceptors in vivo after topical administration. This non-invasive, needle-free technology expands the application of SMDs for the treatment of a vast spectrum of retinal degenerations and other ocular diseases. [ABSTRACT FROM AUTHOR]

Bardet Biedl syndrome (BBS) is a rare autosomal recessive condition characterised by rod-cone dystrophy, postaxial polydactyly, central obesity, mental retardation, learning difficulties, hypogonadism in males and renal involvement. Renal failure is the most common cause for morbidity and mortality in such individuals. We report the case of BBS with chronic renal failure from north Karnataka. [ABSTRACT FROM AUTHOR]

Purpose: Bardet-Biedl syndrome (BBS) is a ciliopathy with a wide spectrum of symptoms due to primary cilia dysfunction, including genitourinary developmental anomalies as well as impaired reproduction, particularly in males. Primary cilia are known to be required at the following steps of reproduction function: (i) genitourinary organogenesis, (ii) in fetal firing of hypothalamo-pituitary axe, (iii) sperm flagellum structure, and (iv) first zygotic mitosis conducted by proximal sperm centriole. BBS phenotype is not fully understood., Methods: This study explored all steps of reproduction in 11 French male patients with identified BBS mutations., Results: BBS patients frequently presented with genitourinary malformations, such as cryptorchidism (5/11), short scrotum (5/8), and micropenis (5/8), but unexpectedly, with normal testis size (7/8). Ultrasonography highlighted epididymal cysts or agenesis of one seminal vesicle in some cases. Sexual hormones levels were normal in all patients except one. Sperm numeration was normal in 8 out of the 10 obtained samples. Five to 45% of sperm presented a progressive motility. Electron microscopy analysis of spermatozoa did not reveal any homogeneous abnormality. Moreover, a psychological approach pointed to a decreased self-confidence linked to blindness and obesity explaining why so few BBS patients express a child wish., Conclusions: Primary cilia dysfunction in BBS impacts the embryology of the male genital tract, especially epididymis, penis, and scrotum through an insufficient fetal androgen production. However, in adults, sperm structure does not seem to be impacted. These results should be confirmed in a greater BBS patient cohort, focusing on fertility., (© Endocrine Society 2020.)

Bardet Biedl syndrome (BBS) is characterized by obesity, retinitis pigmentosa, hypogonadism, mental retardation and polydactyly. Additionally, renal, cardiac and neurological manifestations may be seen. We report a case of BBS with chronic kidney disease (CKD) at the age of 43. [ABSTRACT FROM AUTHOR]