Publications by authors named "Glenda M Beaman"

9 Publications

  • Page 1 of 1

Early B-cell Factor 3-Related Genetic Disease Can Mimic Urofacial Syndrome.

Kidney Int Rep 2020 Oct 14;5(10):1823-1827. Epub 2020 Jul 14.

Manchester Centre for Genomic Medicine, Manchester University NHS Foundation Trust, Health Innovation Manchester, Manchester, UK.

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http://dx.doi.org/10.1016/j.ekir.2020.07.001DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569699PMC
October 2020

Is Involved in Urinary Tract and Urorectal Development.

Front Cell Dev Biol 2020 7;8:567. Epub 2020 Aug 7.

Institute of Human Genetics, University Hospital Bonn, Bonn, Germany.

Previous studies in developing and zebrafish reported that the phosphate transporter is expressed in pronephric kidneys. The recent identification of as a monoallelic candidate gene for cloacal exstrophy further suggests its involvement in the urinary tract and urorectal development. However, little is known of the functional role of in urinary tract development. Here, we investigated this using morpholino oligonucleotide knockdown of the zebrafish ortholog . This caused kidney cysts and malformations of the cloaca. Moreover, in morphants we demonstrated dysfunctional voiding and hindgut opening defects mimicking imperforate anus in human cloacal exstrophy. Furthermore, we performed immunohistochemistry of an unaffected 6-week-old human embryo and detected in the urinary tract and the abdominal midline, structures implicated in the pathogenesis of cloacal exstrophy. Additionally, we resequenced in 690 individuals with bladder exstrophy-epispadias complex (BEEC) including 84 individuals with cloacal exstrophy. We identified two additional monoallelic variants. One was identified in a case-parent trio with classic bladder exstrophy, and one additional novel variant was detected in an affected mother who transmitted this variant to her affected son. To study the potential cellular impact of variants, we expressed them in HEK293 cells. Here, phosphate transport was not compromised, suggesting that it is not a disease mechanism. However, there was a tendency for lower levels of cleaved caspase-3, perhaps implicating apoptosis pathways in the disease. Our results suggest is involved in urinary tract and urorectal development and implicate as a disease-gene for BEEC.
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http://dx.doi.org/10.3389/fcell.2020.00567DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7426641PMC
August 2020

Ligase IV syndrome can present with microcephaly and radial ray anomalies similar to Fanconi anaemia plus fatal kidney malformations.

Eur J Med Genet 2020 Sep 12;63(9):103974. Epub 2020 Jun 12.

Evolution and Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK; Manchester Centre for Genomic Medicine, Manchester University NHS Foundation Trust, Manchester, UK. Electronic address:

Ligase IV (LIG4) syndrome is a rare disorder of DNA damage repair caused by biallelic, pathogenic variants in LIG4. This is a phenotypically heterogeneous condition with clinical presentation varying from lymphoreticular malignancies in developmentally normal individuals to significant microcephaly, primordial dwarfism, radiation hypersensitivity, severe combined immunodeficiency and early mortality. Renal defects have only rarely been described as part of the ligase IV disease spectrum. We identified a consanguineous family where three siblings presenting with antenatal growth retardation, microcephaly, severe renal anomalies and skeletal abnormalities, including radial ray defects. Autozygosity mapping and exome sequencing identified a novel homozygous frameshift variant in LIG4, c.597_600delTCAG, p.(Gln200LysfsTer33), which segregated in the family. LIG4 is encoded by a single exon and so this frameshift variant is predicted to result in a protein truncated by 678 amino acids. This is the shortest predicted LIG4 protein product reported and correlates with the most severe clinical phenotype described to date. We note the clinical overlap with Fanconi anemia and suggest that LIG4 syndrome is considered in the differential diagnosis of this severe developmental disorder.
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http://dx.doi.org/10.1016/j.ejmg.2020.103974DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7445424PMC
September 2020

Loss-of-function variants in myocardin cause congenital megabladder in humans and mice.

J Clin Invest 2019 12;129(12):5374-5380

Department of Experimental Cardiology, Amsterdam UMC, Amsterdam, Netherlands.

Myocardin (MYOCD) is the founding member of a class of transcriptional coactivators that bind the serum-response factor to activate gene expression programs critical in smooth muscle (SM) and cardiac muscle development. Insights into the molecular functions of MYOCD have been obtained from cell culture studies, and to date, knowledge about in vivo roles of MYOCD comes exclusively from experimental animals. Here, we defined an often lethal congenital human disease associated with inheritance of pathogenic MYOCD variants. This disease manifested as a massively dilated urinary bladder, or megabladder, with disrupted SM in its wall. We provided evidence that monoallelic loss-of-function variants in MYOCD caused congenital megabladder in males only, whereas biallelic variants were associated with disease in both sexes, with a phenotype additionally involving the cardiovascular system. These results were supported by cosegregation of MYOCD variants with the phenotype in 4 unrelated families by in vitro transactivation studies in which pathogenic variants resulted in abrogated SM gene expression and by the finding of megabladder in 2 distinct mouse models with reduced Myocd activity. In conclusion, we have demonstrated that variants in MYOCD result in human disease, and the collective findings highlight a vital role for MYOCD in mammalian organogenesis.
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http://dx.doi.org/10.1172/JCI128545DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6877301PMC
December 2019

A homozygous missense variant in CHRM3 associated with familial urinary bladder disease.

Clin Genet 2019 12 11;96(6):515-520. Epub 2019 Sep 11.

Manchester Centre for Genomic Medicine, Manchester University NHS Foundation Trust, Health Innovation Manchester, Manchester, UK.

CHRM3 codes for the M3 muscarinic acetylcholine receptor that is located on the surface of smooth muscle cells of the detrusor, the muscle that effects urinary voiding. Previously, we reported brothers in a family affected by a congenital prune belly-like syndrome with mydriasis due to homozygous CHRM3 frameshift variants. In this study, we describe two sisters with bladders that failed to empty completely and pupils that failed to constrict fully in response to light, who are homozygous for the missense CHRM3 variant c.352G > A; p.(Gly118Arg). Samples were not available for genotyping from their brother, who had a history of multiple urinary tract infections and underwent surgical bladder draining in the first year of life. He died at the age of 6 years. This is the first independent report of biallelic variants in CHRM3 in a family with a rare serious bladder disorder associated with mydriasis and provides important evidence of this association.
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http://dx.doi.org/10.1111/cge.13631DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6899476PMC
December 2019

Rare Variants in BNC2 Are Implicated in Autosomal-Dominant Congenital Lower Urinary-Tract Obstruction.

Am J Hum Genet 2019 05;104(5):994-1006

Department of Pediatrics, Children's Hospital, University Hospital Bonn, 53113 Bonn, Germany; Institute of Human Genetics, University of Bonn, 53127 Bonn, Germany. Electronic address:

Congenital lower urinary-tract obstruction (LUTO) is caused by anatomical blockage of the bladder outflow tract or by functional impairment of urinary voiding. About three out of 10,000 pregnancies are affected. Although several monogenic causes of functional obstruction have been defined, it is unknown whether congenital LUTO caused by anatomical blockage has a monogenic cause. Exome sequencing in a family with four affected individuals with anatomical blockage of the urethra identified a rare nonsense variant (c.2557C>T [p.Arg853]) in BNC2, encoding basonuclin 2, tracking with LUTO over three generations. Re-sequencing BNC2 in 697 individuals with LUTO revealed three further independent missense variants in three unrelated families. In human and mouse embryogenesis, basonuclin 2 was detected in lower urinary-tract rudiments. In zebrafish embryos, bnc2 was expressed in the pronephric duct and cloaca, analogs of the mammalian lower urinary tract. Experimental knockdown of Bnc2 in zebrafish caused pronephric-outlet obstruction and cloacal dilatation, phenocopying human congenital LUTO. Collectively, these results support the conclusion that variants in BNC2 are strongly implicated in LUTO etiology as a result of anatomical blockage.
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http://dx.doi.org/10.1016/j.ajhg.2019.03.023DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6506863PMC
May 2019

22q11.2 duplications in a UK cohort with bladder exstrophy-epispadias complex.

Am J Med Genet A 2019 03 9;179(3):404-409. Epub 2019 Jan 9.

Evolution and Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom.

The bladder exstrophy-epispadias complex (BEEC) comprises of a spectrum of anterior midline defects, all affecting the lower urinary tract, the external genitalia, and the bony pelvis. In extreme cases, the gastrointestinal tract is also affected. The pathogenesis of BEEC is unclear but chromosomal aberrations have been reported. In particular, duplications of 22q11.2 have been identified in eight unrelated individuals with BEEC. The current study aimed to identify chromosomal copy number variants in BEEC. Analyses was performed using the Affymetrix Genome-wide SNP6.0 assay in 92 unrelated patients cared for by two UK pediatric urology centers. Three individuals had a 22q11.2 duplication, a significantly higher number than that found in a control group of 12,500 individuals with developmental delay who had undergone microarray testing (p < .0001). Sequencing of CRKL, implicated in renal tract malformations in DiGeorge syndrome critical region at 22q11, in 89 individuals with BEEC lacking 22q11 duplications revealed no pathogenic variants. To date, 22q11.2 duplication is the genetic variant most commonly associated with BEEC. This is consistent with the hypothesis that altered expression of a single, yet to be defined, gene therein is critical to the pathogenesis of this potentially devastating congenital disorder.
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http://dx.doi.org/10.1002/ajmg.a.61032DOI Listing
March 2019

Clinical and genetic heterogeneity in Melkersson-Rosenthal Syndrome.

Eur J Med Genet 2019 Jun 11;62(6):103536. Epub 2018 Sep 11.

Manchester Centre for Genomic Medicine, Evolution and Genomic Sciences, University of Manchester, Manchester, UK; Manchester Centre for Genomic Medicine, St. Mary's Hospital, Manchester University NHS Foundation Trust, Manchester, UK. Electronic address:

Melkersson Rosenthal syndromes (MRS) is a rare autosomal dominantly inherited neurocutaneous syndrome characterised by a triad of facial (seventh cranial) nerve palsy, recurrent orofacial swelling and fissuring of the tongue. A recent report implicated a heterozygous missense variant in SLC27A1 (FATP1) as the cause of this condition in members of an affected Chinese family. We undertook Sanger sequencing of this gene in 14 affected unrelated individuals affected by MRS. We did not detect any putative pathogenic variants. Our data indicates that there is both clinical and genetic heterogeneity in this condition and that the causative gene remains to be identified for the majority of cases.
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http://dx.doi.org/10.1016/j.ejmg.2018.09.003DOI Listing
June 2019

Investigation into the potential for hypoxic interior of neoplasms to enhance HSPA expression in glioma.

Mol Cell Biochem 2014 Sep 16;394(1-2):53-8. Epub 2014 May 16.

School of Forensic and Investigative Sciences, University of Central Lancashire, Preston, PR1 2HE, UK.

Production of heat shock protein 70 (HSP70/HSPA) is induced by a wide range of cellular stress conditions, such as cancer and hypoxia. This study investigated the level of HSPA gene expression in human cell lines exposed to hypoxic conditions. Three human glioma cell lines were selected for this study, each representing different types of glioma (astrocytoma, oligodendroglioma and glioblastoma), with a normal human astrocyte cell line used as a control. HSPA RNA transcripts and proteins were examined in these samples using qRT-PCR, immunofluorescence and flow cytometry techniques. The average HSPA mRNA copy numbers detected in three glioma cell lines were approximately sixfold higher than in a normal astrocyte cell line. The expression of HSPA was induced in normal cell lines immediately after exposure to hypoxia with 33% of cells exhibiting expression. However, the effects of hypoxia on gene expression were marginal in glioma cells, due to the already increased levels of HSPA with both pre- and post-hypoxia samples showing expression in approximately 90% of cells. These results show that whilst the stress caused by both cancer and hypoxia induce HSPA expression the underlying imprint of tumourgenesis leads to sustained expression.
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http://dx.doi.org/10.1007/s11010-014-2080-9DOI Listing
September 2014