Francois V. Bolduc's research while affiliated with University of Alberta and other places
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Publications (63)
BACKGROUND
Providing patients and families with trusted information is needed more than ever with the abundance of online information. Several organizations aim to build databases which can be searched based on needs by target groups. One such group is individuals with neurodevelopmental disabilities (NDD) and their families. NDDs affect up to 18%...
Identifying fake news is a very difficult task, especially when considering the multiple modes of conveying information through text, image, video and/or audio. We attempted to tackle the problem of automated misinformation/disinformation detection in multi-modal news sources (including text and images) through our simple, yet effective, approach i...
Background:
Understanding how individuals think about a topic, known as the mental model, can significantly improve communication, especially in the medical domain where emotions and implications are high. Neurodevelopmental disorders (NDDs) represent a group of diagnoses, affecting up to 18% of the global population, involving differences in the...
BACKGROUND
Understanding how individuals think about a topic can help to significantly improve communication. This is especially true when it comes to the medical domain where emotion and implications are high. Neurodevelopmental disorders (NDD) represent a group of diagnoses, affecting up to 18% of the population, involving differences in the deve...
BACKGROUND
Understanding memory development has fascinated scientists for over 100 years, with important insights in genetics and molecular mechanisms being provided from animal model testing in the last 3 decades. Nonetheless, unlike for animals, testing memory can be challenging in children, especially when they have neurodevelopmental disorders...
[This corrects the article DOI: 10.3389/fpsyt.2021.716707.].
Identifying fake news is a very difficult task, especially when considering the multiple modes of conveying information through text, image, video and/or audio. We attempted to tackle the problem of automated misinformation/disinformation detection in multi-modal news sources (including text and images) through our simple, yet effective, approach i...
A critical step in preserving protein homeostasis by the ubiquitin-proteasome system (UPS) is the recognition, binding, unfolding, and translocation of protein substrates by AAA-ATPase proteasome subunits for degradation by 26S proteasomes. Here, we identified fourteen different de novo missense variants in the PSMC3 gene encoding the AAA-ATPase pr...
The challenges of caring for children with complex health needs, such as intellectual disability (ID) and autism spectrum disorder (ASD), are multiple and experienced by both caregivers and health professionals. Fragile X syndrome (FXS) is the most common single gene cause of ID and ASD, and provides a pertinent model to understand these complexiti...
Introduction: Fragile X syndrome (FXS) is a genetic disorder caused by a mutation of the fragile X mental retardation 1 gene ( FMR1 ). FXS is associated with neurophysiological abnormalities, including cortical hyperexcitability. Alterations in electroencephalogram (EEG) resting-state power spectral density (PSD) are well-defined in FXS and were fo...
Most major events are often accompanied by misinformation on online Social Networking platforms. Due to its nature, the COVID-19 pandemic was bound to lead to an explosion of information online, much of it false or misleading. This information explosion, termed ``infodemic'' by the World Health Organization (WHO), has revealed the need for automati...
Fragile X syndrome (FXS) is the most common single-gene cause of intellectual disability and autism spectrum disorder. Individuals with FXS present with a wide range of severity in multiple phenotypes including cognitive delay, behavioral challenges, sleep issues, epilepsy, and anxiety. These symptoms are also shared by many individuals with other...
BACKGROUND
Chatbots have been increasingly considered for applications in the health and social care fields. Currently, it remains unclear how a chatbot could engage users coping with complex health needs, such as parents of individuals with neurodevelopmental disorders (NDDs), who often need frequent and ongoing support. One approach to enhancing...
Background:
Chatbots have been increasingly considered for applications in the health care field. However, it remains unclear how a chatbot can assist users with complex health needs, such as parents of children with neurodevelopmental disorders (NDDs) who need ongoing support. Often, this population must deal with complex and overwhelming health...
Biallelic mutations in SNORD118, encoding the small nucleolar RNA U8, cause leukoencephalopathy with calcifications and cysts (LCC). Given the difficulty in interpreting the functional consequences of variants in nonprotein encoding genes, and the high allelic polymorphism across SNORD118 in controls, we set out to provide a description of the mole...
We report bi-allelic pathogenic HPDL variants as a cause of a progressive, pediatric-onset spastic movement disorder with variable clinical presentation. The single-exon gene HPDL encodes a protein of unknown function with sequence similarity to 4-hydroxyphenylpyruvate dioxygenase. Exome sequencing studies in 13 families revealed bi-allelic HPDL va...
Objectives
Nutritional intake during gestation is known to impact health outcomes for progeny. Correlational evidence in humans suggests that increased fruit consumption of pregnant mothers enhances infant cognitive development. Moreover, wild-type Drosophila supplemented with a combination of orange and tomato juice showed robust enhancements in p...
Acetylation of the lysine residues in histones and other DNA-binding proteins plays a major role in regulation of eukaryotic gene expression. This process is controlled by histone acetyltransferases (HATs/KATs) found in multiprotein complexes that are recruited to chromatin by the scaffolding subunit transformation/transcription domain-associated p...
Sensory processing dysfunction (SPD) is present in most patients with intellectual disability (ID) and autism spectrum disorder (ASD). Silencing expression of the Fragile X mental retardation 1 (FMR1) gene leads to Fragile X syndrome (FXS), the most common single gene cause of ID and ASD. Drosophila have a highly conserved FMR1 ortholog, dfmr1. dfm...
Spatial requirement and CO2 response in dfmr1 mutants. (A)
Feb170-Gal4:UAS-dfmr1RNAi1-7 flies did not exhibit any defect in avoidance response compared to WT flies (Student’s t-test P = 0.8973; N = 10). (B)
Feb170-Gal4:UAS-dfmr1RNAi1-7 flies did not exhibit any defect in avoidance when tested against WT dSO (Student’s t-test P = 0.2119; N = 10). (C...
As genome wide techniques become more common, an increasing proportion of patients with intellectual disability (ID) are found to have genetic defects allowing genotype–phenotype correlations. Previously, AKT3 deletion was suggested to be responsible for microcephaly in patients with 1q43-q44 deletion syndrome, but this does not correspond to all c...
Chromatin remodeling is a complex process shaping the nucleosome landscape, thereby regulating the accessibility of transcription factors to regulatory regions of target genes and ultimately managing gene expression. The SWI/SNF (switch/sucrose nonfermentable) complex remodels the nucleosome landscape in an ATP-dependent manner and is divided into...
Fragile X is the most common monogenetic disorder associated with intellectual disability (ID) and autism spectrum disorders (ASD). Additionally, many patients are afflicted with executive dysfunction, ADHD, seizure disorder and sleep disturbances. Fragile X is caused by loss of FMRP expression, which is encoded by the FMR1 gene. Both the fly and m...
Hereditary spastic paraplegia (HSP) is a genetically and clinically heterogeneous disease characterized by spasticity and weakness of the lower limbs with or without additional neurological symptoms. Although more than 70 genes and genetic loci have been implicated in HSP, many families remain genetically undiagnosed, suggesting that other genetic...
. Acute complete external ophthalmoplegia is a rare finding in clinical practice that is associated with diseases affecting the neuromuscular junction, the oculomotor nerves, or the brainstem. Ophthalmoplegia has been reported with acute ataxia in Miller Fisher syndrome (MFS) and Bickerstaff brainstem encephalitis (BBE). Up to 95% of these cases ar...
Hereditary spastic paraplegia (HSP) is a genetically and clinically heterogeneous disease characterized by spasticity and weakness of the lower limbs with or without additional neurological symptoms. Although more than 70 genes and genetic loci have been implicated in HSP, many families remain genetically undiagnosed, suggesting that other genetic...
Supplementary material.
Fragile X syndrome (FXS) is an undertreated neurodevelopmental disorder characterized by low intelligence quotent and a wide range of other symptoms including disordered sleep and autism. Although FXS is the most prevalent inherited cause of intellectual disability, its mechanistic underpinnings are not well understood. Using Drosophila as a model...
Supplementary Figure 2
Dilp2 protein levels are elevated in the IPCs of dfmr1 mutants but dilp2 mRNA levels are not altered. (a) Increased levels of Dilp2 protein are observed in the dfmr1 mutant IPCs relative to WTrescue IPCs throughout the neurites and in the cell bodies (arrowheads). Note that the gain on the confocal was increased to visualize...
Supplementary Figure 5
Effect of developmental and adulthood metformin treatment on circadian behavior and courtship-based memory. (a and b) The circadian behavior of flies raised on (a) 30μM or (b) 100μM metformin and moved to 1mM metformin or vehicle control food within 24 hour of eclosion was examined. Metformin treatment does not improve the rh...
Supplementary Figure 1
Expression of dFMR1 in the IPCs rescues the circadian behavior defect of dfmr1 mutants. (a) Representative actograms reveal arrhythmic free-running rest:activity patterns in dfmr1 mutants containing either the dilp2-Gal4 or UAS-dfmr1 transgenes alone and normal rhythmic behavior in mutants containing both transgenes (dilp2>df...
Supplementary Figure 3
pAkt levels are increased in dfmr1 mutant brains, while baseline GFP-PH and Akt levels are unaltered. (a) A Western of head extracts. No difference in GFP-PH levels is seen between genotypes. Extracts from a fly line not containing the GFP-PH reporter show that the band recognized by α-GFP is specific to the reporter protein....
Supplementary Figure 4
Metformin does not affect memory after massed training or the sensory functions of dfmr1 mutants.
(a) One-day memory after massed training does not differ between groups. (n = 8 PIs per group). (b)
Dfmr1 mutants as well as genetic controls containing the WTrescue genomic rescue fragment show normal shock avoidance with vehicl...
Supplementary Figure 6
Reduction of IS is required at different times to rescue circadian behavior and memory. (a to d) The percentages of strongly rhythmic (FFT≥0.04), weakly rhythmic (0.04>FFT≥0.01) and arrhythmic flies (FFT<0.01) are shown. (a and b)
Dfmr1 mutant flies pan-neuronally expressing DP110DN beginning in the pupal period show (a) a gr...
In-utero nutrition is an under-studied aspect of cognitive development. Fruit has been an important dietary constituent for early hominins and humans. Among 808 eligible CHILD-Edmonton sub-cohort subjects, 688 (85%) had 1-year cognitive outcome data. We found that each maternal daily serving of fruit (sum of fruit plus 100% fruit juice) consumed du...
Kleefstra syndrome (KS; OMIM #610253), formerly known as the 9q subtelomeric deletion syndrome, is an autosomal dominant cause of intellectual disability (ID) characterized by hypotonia and facial dysmorphisms.(1,2) The cause of KS is attributed to haploinsufficiency of the euchromatin histone methyltransferase 1 (EHMT1) gene (OMIM *607001) located...
Hereditary spastic paraplegias (HSPs) are a group of neurodegenerative diseases causing progressive gait dysfunction. Over
50 genes have now been associated with HSP. Despite the recent explosion in genetic knowledge, HSP remains without pharmacological
treatment. Loss-of-function mutation of the SPAST gene, also known as SPG4, is the most common c...
Intellectual disability (ID) is a common neurodevelopmental disorder affecting 3 % of the population. At this time, no pharmacological treatment has been identified for the treatment of ID patients. An increasing number of genes are identified in patients with ID but a significant gap persists between gene discovery and treatment. Lack of treatment...
Locomotive defects resulting from neurodegenerative disorders can be a late onset symptom of disease, following years of subclinical degeneration, and thus current therapeutic treatment strategies are not curative. Through the use of whole exome sequencing, an increasing number of genes have been identified to play a role in human locomotion. Despi...
Intellectual disability (ID), previously known as mental retardation, affects 3% of the population and remains without pharmacological treatment. ID is characterized by impaired general mental abilities associated with defects in adaptive function in which onset occurs before 18 years of age. Genetic factors are increasing and being recognized as t...
Key Clinical Message
We present a patient with trisomy 8p11.21q11.21 associated with language, gross motor, fine motor, and cognitive delay. Furthermore, using array-based comparative genomic hybridization, we identify the specific genes duplicated in our patient.
Memory formation has been shown recently to be dependent on energy status in Drosophila. A well-established energy sensor is the insulin signaling (InS) pathway. Previous studies in various animal models including human have revealed the role of insulin levels in short-term memory but its role in long-term memory remains less clear. We therefore in...
Fragile X syndrome (FXS) is the leading cause of both intellectual disability and autism resulting from a single gene mutation. Previously, we characterized cognitive impairments and brain structural defects in a Drosophila model of FXS and demonstrated that these impairments were rescued by treatment with metabotropic glutamate receptor (mGluR) an...
We report the case of a 29-month-old boy with spasticity and periventricular white matter changes on magnetic resonance imaging in whom a complex rearrangement consisting of a de novo duplication of 14q32.31q32.33 and deletion of 14q32.33 was identified by array-based comparative genomic hybridization. Our case replicates some of the previous featu...
The past decade has witnessed a tremendous increase in our ability to identify precise genetic etiologies of developmental delay and intellectual disability. Mutations in various transcription factors were found in patients with intellectual disability. Specifically, the importance of a subgroup of transcription factors containing zinc finger motif...
We developed a novel assay to examine social interactions in Drosophila and, as a first attempt, apply it here at examining the behavior of Drosophila Fragile X Mental Retardation gene (dfmr1) mutants. Fragile X syndrome is the most common cause of single gene intellectual disability (ID) and is frequently associated with autism. Our results sugges...
The last decade has witnessed the identification of single-gene defects associated with an impressive number of mental retardation syndromes. Fragile X syndrome, the most common cause of mental retardation for instance, results from disruption of the FMR1 gene. Similarly, Periventricular Nodular Heterotopia, which includes cerebral malformation, ep...
Rett syndrome is a severe neurodegenerative disorder characterized by acquired microcephaly, communication dysfunction, psychomotor regression, seizures and stereotypical hand movements. Mutations in methyl CpG binding protein 2 (MECP2) are identified in most patients with classic Rett syndrome. Genetic studies in patients with a Rett variant have...
Mental retardation--known more commonly nowadays as intellectual disability--is a severe neurological condition affecting up to 3% of the general population. As a result of the analysis of familial cases and recent advances in clinical genetic testing, great strides have been made in our understanding of the genetic etiologies of mental retardation...
We used Drosophila olfactory memory as a model to study the molecular basis of cognitive defects in Fragile X syndrome in vivo. We observed that fragile X protein was acutely required and interacted with argonaute1 and staufen in the formation of long-term memory. Occlusion of long-term memory formation in Fragile X mutants could be rescued by prot...
Supplementary Figure 1 Neurogenetic characterizations of disruptions of Fmr1
Supplementary Figure 2 Characterization of the acute role of FMRP
Supplementary Figure 3 FMRP is acutely involved in LTM formation
Angelman syndrome is a neurological disorder whose symptoms include severe mental retardation, loss of motor coordination, and sleep disturbances. The disease is caused by a loss of function of UBE3A, which encodes a HECT-domain ubiquitin ligase. Here, we generate a Drosophila model for the disease. The results of several experiments show that the...
Citations
... UofA-Truth [48] break down the task into two sub-tasks: text entailment and image entailment. For text entailment, they obtain claim text and document text embeddings by passing the text through sentence BERT [49]. ...
... A variety of approaches have been proposed to leverage knowledge in other domains to help health misinformation detection [60,65,122,125,129,147,148,191,197,231,233,241]. To tackle the data scarcity challenge of Covid fact checking, Liu et al. [129] proposed rationale prediction based and masked language model based continuous training to adapt pre-trained language models to Covid domain. ...
... We illustrate this process for the new disease gene PSMC3 in a demonstration on the GestaltMatcher web service (Extended Data Fig. 6, www.gestaltmatcher.org). Ebstein et al. 41 report 22 patients with a neurodevelopmental disorder of heterogeneous dysmorphism that is caused by de novo missense mutations in PSMC3, which encodes a proteasome 26S subunit. Although not all PSMC3 patients have the same facial phenotype, the proximity of two unrelated patients in the CFPS who share the same de novo PSMC3 mutation is exceptional. ...
... More recently, a growing body of the literature has raised the importance of increased variability in neural signals linked to enhanced cognition, as systems need to be tuned on-line to optimize them for behavioral demands [57][58][59]. Our observations, when taken together with other EEG findings in FXS (e.g., decreased peak alpha frequency, decreased neural synchronization to the auditory chirp, reduction in global alpha power with concomitant increases in regional gamma power, reduced EEG signal complexity), suggest a diminished capacity or increased constraints on the expression of neural variability in the FXS cortex [15,22,[60][61][62][63]. Elevated gamma band connectivity and suppressed alpha band connectivity at rest, as found here in individuals with FXS, could reflect a neural state patients are seemingly "stuck" in, thus resulting in reduced ability to dynamically adjust neural responses to environmental demands, especially those requiring higher cognitive skills. ...
... Autism spectrum disorder (ASD) is a frequent comorbid condition seen in 30 to 43% of males with FXS and 16 to 20% of females with FXS [13]. FXS is the most common known single-gene cause of ASD [14][15][16][17]. ...
... Indeed, in a zebrafish model, Badrock et al. demonstrate U8-3 null mutations are embryologically lethal [9] . However, Crow et al. were unable to identify any specific genotype-phenotype relationship to explain symptom variability, including age of onset, implying additive and environmental factors likely play a role in phenotypic expression as well [10] . As ribosomes are central to translation, a process central to protein production to cells throughout the body, a ribosomopathy should be expected to exert ubiquitous deleterious effects; however, the only demonstrated pathology in LCC is cerebral microangiopathy [3] . ...
... Recent studies indicate that 4-hydroxymandelate (4-HMA), an intermediate involved in CoQ 10 biosynthesis, is a product of HPDL [6]. In 2020, Husain et al. described clinical and brain MRI findings in 17 individuals with biallelic HPDL variants (OMIM #619026) [60]. Clinical features in these patients reached from developmental delay, seizures and microcephaly to non-neurological manifestations. ...
... ASD-associated proteins such as FMR1 (Jansen et al., 2017), pogo transposable element derived with ZNF domain (POGZ; Zhao et al., 2019), TSC complex subunit 1 (TSC1)/TSC complex subunit 2 (TSC2; Martin et al., 2020), and phosphatase and tensin homolog (PTEN; Grencewicz et al., 2021), are all involved in the regulation of protein synthesis. Additional risk genes for ASD include dual specificity tyrosine phosphorylation-regulated kinase 1A (Dyrk1a) (Earl et al., 2017), kinesin family member 1 (Kif1) trafficking protein particle complex subunit 9 (Trappc9) (Cogne et al., 2019). Since the etiology for a substantial portion of ASD remains unknown, these genes may only represent the tip of the "heritable ASD" iceberg. ...
... We also show that the observed differences in locomotion after lights-off stimuli between fragile X and control flies cannot be accounted for by deficits in baseline locomotion, as the measured activity and speed before stimulation was comparable or higher to the control lines. Previous studies already reported deficits in odorant sensory responses in fragile X flies [23,24]; however, to the best of our knowledge, this is the first description of deficits in visually evoked motor responses for this model. ...
... Some studies have reported that AKT3, HNRNPU, and ZBTB18 are associated with the neurodevelopmental phenotype of the syndrome (Easton et al., 2005;Ballif et al., 2012;Thierry et al., 2012;Speevak et al., 2013). Easton et al. described a study of AKT3 knockout mice (KO) for AKT3 which resulted in a reduction of brain volume and the size of the corpus callosum, which suggested that AKT3 may be a candidate gene for ACC/MIC (Easton et al., 2005;Raun et al., 2017). Hill et al. and Boland et al. reported that the deletion of the 1q43q44 fragment was associated with MIC (microcephaly), ACC (agenesis of the corpus callosum), and SZR (seizures) (Doco-fenzy et al., 2006;Boland et al., 2007). ...