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Lab De Baere present(ed) @ ESHG 2022

28/6/2022

 
No less than six lab members had an oral talk at the 2022 ESHG meeting. Sarah Vergult and Eva D'Haene presented on Structural variants disrupt a critical regulatory region downstream of FOXG1 and Mapping the 3D genome of the human retina and its role in retinal disease, respectively. Stijn Vandesompele's talk was titled Dual molecular effects of constitutional SF3B2 variants cause a novel dominant spliceosomopathy displaying retinitis pigmentosa or developmental skeletal anomalies and Rocio discussed A novel neurodevelopmental syndrome caused by loss-of-function of the Zinc Finger Homeobox 3 (ZFHX3) gene. Victor López Soriano had a talk on An integrated approach using multi-omics data to dissect cis-regulatory role of ultraconserved non-coding elements (UCNRE) in human retina in the same session as Alfredo, who spoke Identification and charaterization of a novel retina-specific lncRNA upstream ABCA4 with a potential role in ABCA4-associated inherited retinal disease. Congrats to all on the very nice presentations! Miriam Bauwens had a poster presentation.

We attended ARVO 2022 in Denver

28/6/2022

 
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Several Lab De Baere members made the trip to the States to attend ARVO 2022. Oral presentations were given by Munevver Burcu Cicekdal, Alfredo Dueñas Rey and Victor López Soriano, while Miriam Bauwens had a poster presentation.
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Lab De baere represent @ BeSHG 2022

28/6/2022

 
Three Lab De Baere members had an oral presentation and six had a poster presentation at the 22th Belgian Society for Human Genetics meeting in Bruges. Congrats to Eva, Burcu and Rocio for their oral presentations on Mapping the 3D genome of the human retina and its role in retinal disease, Single-cell transcriptional dynamics and in vivo enhancer assays provide insight into gene regulatory networks of PRDM13 and IRX1 implicated in North Carolina macular dystrophy and A novel neurodevelopmental syndrome caused by loss-of-function of the Zinc Finger Homeobox 3 (ZFHX3) gene, respectively. Posters by Miriam, Marta, Alfredo, Charlotte, Marjolein, Victor were visable during the poster sessions. We also had fun during the conference dinner, party and especially during the suprise act by science comedian Lieven Scheiren.




Muhammad Rishfi won a prize for his master thesis

30/10/2021

 
Biomedical scientist and former master student Muhammad Rishfi (aka Affy) has been awarded the ‘Prijs Vrienden van de Bibliomedische Bibliotheek’ for the best interdisciplinary thesis with highest clinical relevance at the Faculty of Medicine and Health Sciences. So well deserved Affy!
What? ‘Gene and protein-based therapy of a dominant target in inherited retinal blindness’. Novel antisenseoligonucleotide & nanobody-based approach to target a dominant mutation in inherited blindness, specifically NR2E3 G56R.
Who? Despite COVID obstacles Affy did brilliant collaborative work with Sarah Naessens, Elfride De Baere, Jan Gettemans, Frauke Coppieters, Olivier Zwaenepoel & Steve Lefever. To be continued by team member Edith De Bruycker.
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oral presentation award @ BeSHG 2021

20/10/2021

 
At the 21th BeSHG meeting "Reproductive Genetics", held in Brussels on September 17 2021, Stijn was awarded for his oral presentation titled "Dual molecular effects of dominant SF3B2 variants cause a novel spliceosomopathy displaying retinitis pigmentosa or developmental skeletal anomalies". This is the second year in a row Stijn has received an award  from the Belgian Society for Human Genetics. Congratulations Stijn!
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Elfride de baere made the european vision institute top list of women in european vision research and ophthalmology 2021

30/8/2021

 
The European Vision Institute has announced its list of top women in European Vision Research and ophthalmology for 2021. Elfride De Baere was granted a place on the list. Congratulations Elfride
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Münevver BurcU Cicekdal won the poster prize at the 18th international xenopus conference 2021

30/8/2021

 
Münevver Burcu Cicekdal received the poster prize at the 18th International Xenopus Conference for her work on rare human genetic disease for which she uses Xenopus tropicalis as a model organism. Congrats Burcu!
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new paper out: Long-read sequencing to unravel complex structural variants of CEP78 leading to Cone‐Rod Dystrophy and Hearing Loss

23/3/2021

 
Check out our latest paper in Frontiers in Cell and Developmental Biology. This is a provisional acceptance at the moment. You can read the abstract below, for the full text click here.

Inactivating variants as well as a missense variant in the centrosomal CEP78 gene have been identified in autosomal recessive Cone-Rod Dystrophy with Hearing Loss (CRDHL), a rare syndromic inherited retinal disease distinct from Usher syndrome. Apart from this, a complex structural variant (SV) implicating CEP78 has been reported in CRDHL. Here we aimed to expand the genetic architecture of typical CRDHL by the identification of complex SVs of the CEP78 region and characterization of their underlying mechanisms. Approaches used for the identification of the SVs are shallow whole genome sequencing (sWGS) combined with quantitative PCR and long-range PCR, or ExomeDepth analysis on whole exome sequencing data. Targeted or whole genome nanopore long-read sequencing (LRS) was used to delineate breakpoint junctions at the nucleotide level. For all SVs cases, the effect of the SVs on CEP78 expression was assessed using qPCR on patient-derived RNA. Apart from two novel canonical CEP78 splice variants and a frameshifting single nucleotide variant, two SVs affecting CEP78 were identified in three unrelated individuals with CRDHL: a heterozygous total gene deletion of 235 kb and a partial gene deletion of 15 kb in a heterozygous and homozygous state, respectively. Assessment of the molecular consequences of the SVs on patient’s materials displayed a loss-of-function effect. Delineation and characterization of the 15 kb deletion using targeted LRS revealed the previously described complex CEP78 SV, suggestive for a recurrent genomic rearrangement. A founder haplotype was demonstrated for the latter SV in cases of Belgian and British origin, respectively. The novel 235 kb deletion was delineated using whole genome LRS. Breakpoint analysis showed microhomology and pointed to a replication-based underlying mechanism. Moreover, data mining of bulk and single-cell human and mouse transcriptional datasets, together with CEP78 immunostaining on human retina, linked the CEP78 expression domain with its phenotypic manifestations. Overall, this study supports that the CEP78 locus is prone to distinct SVs and that SV analysis should be considered in a genetic work-up of CRDHL. Finally, it demonstrated the power of sWGS and both targeted and whole genome LRS in identifying and characterizing complex SVs in patients with ocular diseases.
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Rare-med walks, runs, bikes  to support rare diseases! Support our research on rare diseases!

22/2/2021

 
Dear RARE-MED colleagues and sponsors,

Everyone knows the unicorn, but no one has ever actually seen one. Unicorns only exist in a world of myth and fantasy. On the other hand, people with a rare disease do exist. And they are numerous… About 500,000 Belgians have a rare disease.
On the occasion of the International Day of Rare Diseases 2021 on February 28, we participate in the RadiOrg campaign “Not a Unicorn”. Because people with a rare disease are not unicorns. They really exist.
And you can help make them visible!
 
Sporty top athletes from UZ Gent and UGent will walk, run or cycle between 17 and 28 February 2021. They will be sponsored for this.
In addition to our ambassador of the Rare Diseases Fund, Frances Lefebure, our top RARE-MED team also puts on their sports shoes out of solidarity!
 
Would you like to sponsor our running, walking and cycling campaign?
Then choose this link!
Gifts from 40 € are tax deductible.
 
Thank you!!
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save the date: RARE-MED ONLINE kick-off symposium

17/11/2020

 
We would like to invite you to the online kick-off symposium of the RARE-MED consortium on November 27, 2020, from 14-17.30 p.m. Registration is free of charge and can be done here. Please register if you wish to attend, as only registered people will receive a link for the symposium. The symposium program is displayed below.

RARE-MED is a multidisciplinary UGent consortium for basic and translational research on precision medicine for rare diseases, to address missing heritability using systems genetics and functional genomics, to facilitate disease modelling using CRISPR/Cas9-mediated genome editing of aquatic model organisms (zebrafish, Xenopus) and of cellular systems, to introduce new gene therapies based on antisense oligonucleotide- or CRISPR/Cas9-based genome editing. In the context of this 21ZAP consortium, 3 research professors were appointed: Prof. dr. Sarah Vergult, prof. dr. Kris Vleminckx, and prof. dr. Frauke Coppieters.
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new paper out: Loss of Function of RIMS2 Causes a Syndromic Congenital Cone-Rod Synaptic Disease with Neurodevelopmental and Pancreatic Involvement

30/7/2020

 
Check out our latest paper in The American Journal of Human Genetics. You can read the abstract below, for the full text click here.

Congenital cone-rod synaptic disorder (CRSD), also known as incomplete congenital stationary night blindness (iCSNB), is a non-progressive inherited retinal disease (IRD) characterized by night blindness, photophobia, and nystagmus, and distinctive electroretinographic features. Here, we report bi-allelic RIMS2 variants in seven CRSD-affected individuals from four unrelated families. Apart from CRSD, neurodevelopmental disease was observed in all affected individuals, and abnormal glucose homeostasis was observed in the eldest affected individual. RIMS2 regulates synaptic membrane exocytosis. Data mining of human adult bulk and single-cell retinal transcriptional datasets revealed predominant expression in rod photoreceptors, and immunostaining demonstrated RIMS2 localization in the human retinal outer plexiform layer, Purkinje cells, and pancreatic islets. Additionally, nonsense variants were shown to result in truncated RIMS2 and decreased insulin secretion in mammalian cells. The identification of a syndromic stationary congenital IRD has a major impact on the differential diagnosis of syndromic congenital IRD, which has previously been exclusively linked with degenerative IRD.
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PHD Defence: Functional characterization of potential ciliary genes involved in syndromic inherited retinal diseases

22/6/2020

 
Giulia Ascari virtually defended her PhD thesis on June 18 2020. Congratulations to our doctor, whose favorite genes are RCBTB1 & CEP78.

PHD DEFENCE: Disclosing incidental and secondary findings in clinical genomics: professional practice, patient experience and ethical reflection

11/5/2020

 
On the 27th of April 2020, Marlies Saelaert virtually defended her PhD thesis. This was an unforgettable experience. Congratulations!

PhD defence: Communication through the eyes of the patient: the role of ethnicity, language and education

11/5/2020

 
Our new team member, Karolien Aelbrecht, virtually defended successfully her PhD thesis on April 28 2020. Well done, congratulations Karolien!

new paper out: Resolving the dark matter of ABCA4 for 1054 Stargardt disease probands through integrated genomics and transcriptomics

27/4/2020

 
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In a recently published manuscript in the prestigious journal Genetics in Medicine, a large group of collaborators, led by dr. Claire-Marie Dhaenens and prof. Frans Cremers in the Department of Human Genetics in Nijmegen, the Netherlands, identified the causal mutations in the ABCA4 gene in 448 individuals with Stargardt disease (STGD1). They employed a cost-effective method, based on so-called smMIPs, to sequence the complete ABCA4 gene consisting of 128,313 base pairs. Through a semi-automated procedure, they tested more than 1,000 probands with STGD1 and allied maculopathies for the presence of causal mutations (Khan et al. Genet Med, in press).
Remarkably, they found 105 causal mutations residing in the introns of the ABCA4 gene that led to the disruptive insertion of these non-coding sequences in the messenger RNA and thus a non-functional ABCA4 protein. Among 13 novel RNA insertions identified in splicing assays, they found two intriguing complex RNA defects due to variants in introns 13 and 44.  In addition, they found 16 novel large deletions, two of which were complex. Altogether, these ‘hidden mutations’ were found in 27% of the 448 genetically solved cases, illustrating the unusually high proportion of these types of mutations in STGD1.
This study was made possible through the collaboration of 75 scientists and clinicians from 21 countries from all over the world. Due to the low sequencing costs (€ 30,- per case), the research team in Nijmegen now offers this test to any individual with STGD1 or allied maculopathy in the world, at no costs, on a research basis.
This work was made possible through several grants, the most significant of which were from the RetinaUK, Fighting Blindness Ireland, Foundation Fighting Blindness USA, and the EU.  
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