Publications by authors named "Leah Fleming"

Background: Previous studies in mouse, and zebrafish embryos show strong expression in progenitor cells of neuronal and neural crest tissues suggesting its involvement in neural crest specification. However, the role of human transcription factor activator protein 2 ( in human embryonic central nervous system (CNS), orofacial and maxillofacial development is unknown.

Methods: Through a collaborative work, exome survey was performed in families with congenital CNS, orofacial and maxillofacial anomalies.

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  • - A rare genetic condition involving mitochondrial complex III deficiency and lactic acidosis, characterized by scalp alopecia, was identified in two unrelated cases and discussed further with a participant from the Undiagnosed Diseases Network (UDN).
  • - The participant had two autosomal recessive disorders discovered through genome sequencing: mitochondrial complex III deficiency and cataracts, with specifics on previously documented pathogenic variants for each condition.
  • - A combination of enzyme assays and cellular proteomics showed clear dysfunction in complex III and low levels of a crucial protein, validating the genetic mutations' pathogenic effects and broadening understanding of these rare disorders.
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  • * The RADICAL trial is a randomized controlled study involving 250 adults, comparing RFD to a placebo, with the primary goal of assessing pain severity three months after the procedure.
  • * The study will also evaluate various outcomes such as disability and quality of life up to two years later and aims to provide better economic insights into RFD's effectiveness from the NHS's perspective.
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Introduction: Lung cancer is the most common cause of cancer death worldwide and most patients present with extensive disease. One-year survival is improving but remains low (37%) despite novel systemic anti-cancer treatments forming the current standard of care. Although new therapies improve survival, most patients have residual disease after treatment, and little is known on how best to manage it.

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Psychotic disorders are highly heterogeneous. Understanding relationships between symptoms will be relevant to their underlying pathophysiology. We apply dimensionality-reduction methods across two unique samples to characterize the patterns of symptom organization.

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  • * Among the three cases with confirmed kidney tumors, it marks the first known link between these two syndromes in adults, while the fourth case had skin lesions known as fibrofolliculomas.
  • * Our findings indicate that individuals with Smith-Magenis syndrome should begin kidney cancer screening at age 20, similar to guidelines for Birt-Hogg-Dubé syndrome.
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Rationale: While neural correlates of hallucinations are known, the mechanisms have remained elusive. Mechanistic insight is more practicable in animal models, in which causal relationships can be established. Recent work developing animal models of hallucination susceptibility has focused on the genesis of perceptual expectations and perceptual decision-making.

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  • Recent findings on biallelic DNAJC30 variants challenge the idea that Leber hereditary optic neuropathy (LHON) is only passed down from mothers and broaden the understanding of Leigh syndrome, the most common mitochondrial disease in kids.
  • A study identified 28 new individuals with a specific DNAJC30 genetic variant: 24 had LHON, 2 had Leigh syndrome, and 2 were asymptomatic, indicating that the genetic impact varies by sex.
  • Those with autosomal recessive LHON showed earlier onset and better recovery rates with treatment compared to previously known maternal cases, and the discovery of two more Leigh syndrome patients enhances the link between DNAJC30 and this condition.
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  • Researchers identified a new autosomal recessive neurodevelopmental disorder linked to biallelic variants in the TMEM222 gene in 17 individuals from nine families.
  • The study used exome sequencing and gene matching tools to detect these pathogenic variants, along with RT-qPCR to analyze gene expression.
  • Findings indicate that TMEM222 is significantly expressed in the brain and plays a role in brain development and function, suggesting it contributes to the disorder's symptoms.
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  • - Int22h1/Int22h2-mediated Xq28 duplication syndrome is an X-linked intellectual disability caused by duplications on the X chromosome, leading to cognitive deficits, facial differences, and behavioral issues like hyperactivity and irritability.
  • - The study presents cases of nine individuals with this syndrome, including unique findings such as de novo duplications, prenatal diagnoses, and atypical duplication variations.
  • - New manifestations noted in the syndrome include vertebral anomalies and multiple malignancies, which may broaden the understanding of its clinical features.
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Ketamine is an uncompetitive N-methyl-d-aspartate (NMDA) glutamate receptor antagonist. It induces effects in healthy individuals that mimic symptoms associated with schizophrenia. We sought to root these experiences in altered brain function, specifically aberrant resting state functional connectivity (rsfMRI).

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  • The original article had a spelling mistake in the author's name.
  • J. Lawrence Merritt was incorrectly spelled as Lawrence Merritt.
  • The correction has been made in both the PDF and HTML versions of the article.
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Purpose: TANGO2-related disorders were first described in 2016 and prior to this publication, only 15 individuals with TANGO2-related disorder were described in the literature. Primary features include metabolic crisis with rhabdomyolysis, encephalopathy, intellectual disability, seizures, and cardiac arrhythmias. We assess whether genotype and phenotype of TANGO2-related disorder has expanded since the initial discovery and determine the efficacy of exome sequencing (ES) as a diagnostic tool for detecting variants.

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  • * A study of 72 participants provided detailed analysis of SAS, going beyond previous limited reports to identify key clinical and genetic characteristics.
  • * Major findings highlight severe speech delays, palate and dental abnormalities, and behavioral issues, which can aid healthcare providers in diagnosis and management, offering better support for affected families.
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  • Joubert syndrome is a complex genetic disorder linked to over 30 genes and is associated with kidney disease, affecting about 30% of individuals in a studied cohort of 97 patients.
  • Through comprehensive evaluations including DNA sequencing, the study identified mutations in 19 genes, with the highest incidence of kidney issues in patients with mutations in specific genes.
  • Prenatal ultrasound is not an effective predictor of kidney disease in these patients, and various kidney conditions were observed, including nephronophthisis and autosomal recessive polycystic kidney disease-like changes, often accompanied by early-onset hypertension.
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Horstick et al. (2013) previously reported a homozygous p.Trp284Ser variant in STAC3 as the cause of Native American myopathy (NAM) in 5 Lumbee Native American families with congenital hypotonia and weakness, cleft palate, short stature, ptosis, kyphoscoliosis, talipes deformities, and susceptibility to malignant hyperthermia (MH).

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The mismatch negativity (MMN) is an event-related potential that is consistently attenuated in people with schizophrenia. Within the predictive coding model of psychosis, MMN impairment is thought to reflect the same prediction failures that are also thought to underlie the development and crystallization of delusions and hallucinations. However, the true relationship between symptom severity and MMN impairment across studies has not yet been established.

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Mutations in PIGN, resulting in multiple congenital anomalies-hypotonia-seizures syndrome, a glycosylphosphatidylinositol anchor deficiency, have been published in four families to date. We report four patients from three unrelated families with epilepsy and hypotonia in whom whole exome sequencing yielded compound heterozygous variants in PIGN. As with previous reports Patients 1 and 2 (full siblings) have severe global developmental delay, gastroesophageal reflux disease, and minor dysmorphic features, including high palate, bitemporal narrowing, depressed nasal bridge, and micrognathia; Patient 3 had early global developmental delay with later progressive spastic quadriparesis, intellectual disability, and intractable generalized epilepsy; Patient 4 had bilateral narrowing as well but differed by the presence of hypertelorism, markedly narrow palpebral fissures, and long philtrum, had small distal phalanges of fingers 2, 3, and 4, absent distal phalanx of finger 5 and similar toe anomalies, underdeveloped nails, unusual brain anomalies, and a more severe early clinical course.

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Elucidating the function of highly conserved regulatory sequences is a significant challenge in genomics today. Certain intragenic highly conserved elements have been associated with regulating levels of core components of the spliceosome and alternative splicing of downstream genes. Here we identify mutations in one such element, a regulatory alternative exon of SNRPB as the cause of cerebro-costo-mandibular syndrome.

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