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Author = Ennis, Sean;
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Displaying Results 1 - 17 of 17 on page 1 of 1
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A case report of primary ciliary dyskinesia, laterality defects and developmental delay caused by the co-existence of a single gene and chromosome disorder
(2015)
Casey, Jillian; Goggin, Patricia; McDaid, Jennifer; Ennis, Sean; Lynch, Sally; et al.
A case report of primary ciliary dyskinesia, laterality defects and developmental delay caused by the co-existence of a single gene and chromosome disorder
(2015)
Casey, Jillian; Goggin, Patricia; McDaid, Jennifer; Ennis, Sean; Lynch, Sally; et al.
Abstract:
Background: Primary ciliary dyskinesia (PCD) is a rare autosomal recessive disorder characterised by abnormal ciliary motion and impaired mucociliary clearance, leading to recurrent respiratory infections, sinusitis, otitis media and male infertility. Some patients also have laterality defects. We recently reported the identification of three disease-causing PCD genes in the Irish Traveller population; RSPH4A, DYX1C1 and CCNO. We have since assessed an additional Irish Traveller family with a complex phenotype involving PCD who did not have any of the previously identified PCD mutations. Case presentation: In this study we report on a family with three children with PCD and various laterality defects. In addition, one child (V:1) has mild-to-moderate developmental delay and one child has speech delay (V:2). Developmental delay is not usually associated with PCD and is likely to be caused by an additional genetic abnormality. Transmission electron microscopy showed variable inner and...
http://hdl.handle.net/10197/6739
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A case report of primary ciliary dyskinesia, laterality defects and developmental delay caused by the co-existence of a single gene and chromosome disorder.
(2015)
Casey, Jillian P; Goggin, Patricia; McDaid, Jennifer; White, Martin; Ennis, Sean; Betts...
A case report of primary ciliary dyskinesia, laterality defects and developmental delay caused by the co-existence of a single gene and chromosome disorder.
(2015)
Casey, Jillian P; Goggin, Patricia; McDaid, Jennifer; White, Martin; Ennis, Sean; Betts, David R; Lucas, Jane S; Elnazir, Basil; Lynch, Sally Ann
Abstract:
Primary ciliary dyskinesia (PCD) is a rare autosomal recessive disorder characterised by abnormal ciliary motion and impaired mucociliary clearance, leading to recurrent respiratory infections, sinusitis, otitis media and male infertility. Some patients also have laterality defects. We recently reported the identification of three disease-causing PCD genes in the Irish Traveller population; RSPH4A, DYX1C1 and CCNO. We have since assessed an additional Irish Traveller family with a complex phenotype involving PCD who did not have any of the previously identified PCD mutations.
http://hdl.handle.net/10147/559434
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A genome-wide scan for common alleles affecting risk for autism
(2013)
Anney, Richard; Klei, Lambertus; Pinto, Dalila; Regan, Regina; Casey, Jillian; Segurado...
A genome-wide scan for common alleles affecting risk for autism
(2013)
Anney, Richard; Klei, Lambertus; Pinto, Dalila; Regan, Regina; Casey, Jillian; Segurado, Ricardo; Shah, Naisha; Ennis, Sean; et al.
Abstract:
Although autism spectrum disorders (ASDs) have a substantial genetic basis, most of the known genetic risk has been traced to rare variants, principally copy number variants (CNVs). To identify common risk variation, the Autism Genome Project (AGP) Consortium genotyped 1558 rigorously defined ASD families for 1 million single-nucleotide polymorphisms (SNPs) and analyzed these SNP genotypes for association with ASD. In one of four primary association analyses, the association signal for marker rs4141463, located within MACROD2, crossed the genome-wide association significance threshold of P < 5 × 10−8. When a smaller replication sample was analyzed, the risk allele at rs4141463 was again over-transmitted; yet, consistent with the winner's curse, its effect size in the replication sample was much smaller; and, for the combined samples, the association signal barely fell below the P < 5 × 10−8 threshold. Exploratory analyses of phenotypic subtypes yielded no significant asso...
http://hdl.handle.net/10197/4375
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A novel approach of homozygous haplotype sharing identifies candidate genes in autism spectrum disorder
(2014)
Casey, Jillian; Magalhaes, Tiago; Conroy, Judith M.; Regan, Regina; Shah, Naisha; Shiel...
A novel approach of homozygous haplotype sharing identifies candidate genes in autism spectrum disorder
(2014)
Casey, Jillian; Magalhaes, Tiago; Conroy, Judith M.; Regan, Regina; Shah, Naisha; Shields, Denis C.; Green, Andrew; Ennis, Sean; et al.
Abstract:
Autism spectrum disorder (ASD) is a highly heritable disorder of complex and heterogeneous aetiology. It is primarily characterized by altered cognitive ability including impaired language and communication skills and fundamental deficits in social reciprocity. Despite some notable successes in neuropsychiatric genetics, overall, the high heritability of ASD (~90%) remains poorly explained by common genetic risk variants. However, recent studies suggest that rare genomic variation, in particular copy number variation, may account for a significant proportion of the genetic basis of ASD. We present a large scale analysis to identify candidate genes which may contain low-frequency recessive variation contributing to ASD while taking into account the potential contribution of population differences to the genetic heterogeneity of ASD. Our strategy, homozygous haplotype (HH) mapping, aims to detect homozygous segments of identical haplotype structure that are shared at a higher frequenc...
http://hdl.handle.net/10197/6163
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Atypical Alstrom syndrome with novel ALMS1 mutations precluded by current diagnostic criteria.
(2014)
Casey, Jillian; McGettigan, Paul; Brosnahan, Donal; Curtis, Emma; Treacy, Eileen; Ennis...
Atypical Alstrom syndrome with novel ALMS1 mutations precluded by current diagnostic criteria.
(2014)
Casey, Jillian; McGettigan, Paul; Brosnahan, Donal; Curtis, Emma; Treacy, Eileen; Ennis, Sean; Lynch, Sally Ann
Abstract:
We report on clinical and genetic studies in a non-consanguineous Irish sib-pair with infantile dilated cardiomyopathy and retinopathy. A diagnosis of Alström Syndrome (AS) was considered and diagnostic testing pursued. The Alströms gene (ALMS1) is very large (23 exons) and diagnostic testing of mutational hotspots (exon 6, 8 and 10) was negative. Furthermore the siblings were tall and did not have the typical phenotype of nystagmus, photophobia, obesity or hearing loss and so the AS diagnosis was removed. We then sought to identify the causative gene in this family using whole exome sequencing. Unexpectedly, the exome analysis identified novel compound heterozygous ALMS1 mutations in exon 5 (c.777delT:p.D260fs*26) and exon 20 (c.12145_12146insC:p.S4049fs*36) that segregated with the phenotype. Although the siblings show some clinical overlap with AS, their phenotype is not classical. It is plausible that their atypical presentation may be due to the location of the ALMS1 mutations ...
http://hdl.handle.net/10147/322492
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Atypical benign partial epilepsy of childhood with acquired neurocognitive, lexical semantic, and autistic spectrum disorder
(2018)
Allen, Nicholas M.; Conroy, Judith; Deonna, Thierry; McCreary, Dara; McGettigan, Paul; ...
Atypical benign partial epilepsy of childhood with acquired neurocognitive, lexical semantic, and autistic spectrum disorder
(2018)
Allen, Nicholas M.; Conroy, Judith; Deonna, Thierry; McCreary, Dara; McGettigan, Paul; Madigan, Cathy; Carter, Imogen; Ennis, Sean; Lynch, Sally A.; Shahwan, Amre; King, Mary D.
http://hdl.handle.net/10379/10226
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Common polygenic variation in coeliac disease and confirmation of znf335 and nifa as disease susceptibility loci
(2018)
Coleman, Ciara; Quinn, Emma M; Ryan, Anthony W; Conroy, Judith; Trimble, Valerie; Mahmu...
Common polygenic variation in coeliac disease and confirmation of znf335 and nifa as disease susceptibility loci
(2018)
Coleman, Ciara; Quinn, Emma M; Ryan, Anthony W; Conroy, Judith; Trimble, Valerie; Mahmud, Nasir; Kennedy, Nicholas; Corvin, Aiden P; Morris, Derek W.; Donohoe, Gary; O'Morain, Colm; MacMathuna, Padraic; Byrnes, Valerie; Kiat, Clifford; Trynka, Gosia; Wijmenga, Cisca; Kelleher, Dermot; Ennis, Sean; Anney, Richard JL; McManus, Ross
Abstract:
Coeliac disease (CD) is a chronic immune-mediated disease triggered by the ingestion of gluten. It has an estimated prevalence of approximately 1% in European populations. Specific HLA-DQA1 and HLA-DQB1 alleles are established coeliac susceptibility genes and are required for the presentation of gliadin to the immune system resulting in damage to the intestinal mucosa. In the largest association analysis of CD to date, 39 non-HLA risk loci were identified, 13 of which were new, in a sample of 12 014 individuals with CD and 12 228 controls using the Immunochip genotyping platform. Including the HLA, this brings the total number of known CD loci to 40. We have replicated this study in an independent Irish CD case-control population of 425 CD and 453 controls using the Immunochip platform. Using a binomial sign test, we show that the direction of the effects of previously described risk alleles were highly correlated with those reported in the Irish population, (P= 2.2 x 10(-16)). Usin...
http://hdl.handle.net/10379/10836
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Excess of rare novel loss-of-function variants in synaptic genes in schizophrenia and autism spectrum disorders
(2020)
Kenny, Elaine M.; Cormican, Paul; Furlong, Sarah; Heron, Eleisa; Kenny, Graham; Fahey, ...
Excess of rare novel loss-of-function variants in synaptic genes in schizophrenia and autism spectrum disorders
(2020)
Kenny, Elaine M.; Cormican, Paul; Furlong, Sarah; Heron, Eleisa; Kenny, Graham; Fahey, Ciara; Kelleher, Eric; Ennis, Sean; Tropea, Daniela; Anney, Richard; Corvin, Aiden P.; Donohoe, Gary; Gallagher, Louise; Gill, Michael; Morris, Derek W.
Abstract:
Schizophrenia (SZ) and autism spectrum disorders (ASDs) are complex neurodevelopmental disorders that may share an underlying pathology suggested by shared genetic risk variants. We sequenced the exonic regions of 215 genes in 147 ASD cases, 273 SZ cases and 287 controls, to identify rare risk mutations. Genes were primarily selected for their function in the synapse and were categorized as: (1) Neurexin and Neuroligin Interacting Proteins, (2) Post-synaptic Glutamate Receptor Complexes, (3) Neural Cell Adhesion Molecules, (4) DISC1 and Interactors and (5) Functional and Positional Candidates. Thirty-one novel loss-of-function (LoF) variants that are predicted to severely disrupt protein-coding sequence were detected among 2 861 rare variants. We found an excess of LoF variants in the combined cases compared with controls (P=0.02). This effect was stronger when analysis was limited to singleton LoF variants (P=0.0007) and the excess was present in both SZ (P=0.002) and ASD (P=0.001)...
http://hdl.handle.net/10379/16269
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First implication of STRA6 mutations in isolated anophthalmia, microphthalmia and coloboma: a new dimension to the STRA6 phenotype
(2014)
Casey, Jillian; Kawaguchi, Riki; Morrissey, Maria; McGettigan, Paul A.; Nielsen, Jens E...
First implication of STRA6 mutations in isolated anophthalmia, microphthalmia and coloboma: a new dimension to the STRA6 phenotype
(2014)
Casey, Jillian; Kawaguchi, Riki; Morrissey, Maria; McGettigan, Paul A.; Nielsen, Jens Erik; Conroy, Judith; Regan, Regina; Kennedy, Breandán; Lynch, Sally; Green, Andrew; Ennis, Sean; et al.
Abstract:
Microphthalmia, anophthalmia, and coloboma (MAC) are structural congenital eye malformations that cause a significant proportion of childhood visual impairments. Several disease genes have been identified but do not account for all MAC cases, suggesting that additional risk loci exist. We used single nucleotide polymorphism (SNP) homozygosity mapping (HM) and targeted next-generation sequencing to identify the causative mutation for autosomal recessive isolated colobomatous microanophthalmia (MCOPCB) in a consanguineous Irish Traveller family. We identified a double-nucleotide polymorphism (g.1157G>A and g.1156G>A; p.G304K) in STRA6 that was homozygous in all of the MCOPCB patients. The STRA6 p.G304K mutation was subsequently detected in additional MCOPCB patients, including one individual with Matthew-Wood syndrome (MWS; MCOPS9). STRA6 encodes a transmembrane receptor involved in vitamin A uptake, a process essential to eye development and growth. We have shown that the G304K...
http://hdl.handle.net/10197/5790
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Functional impact of global rare copy number variation in autism spectrum disorders
(2013)
Pinto, Dalila; Pagnamenta, Alistair T.; Klei, Lambertus; Regan, Regina; Conroy, Judith;...
Functional impact of global rare copy number variation in autism spectrum disorders
(2013)
Pinto, Dalila; Pagnamenta, Alistair T.; Klei, Lambertus; Regan, Regina; Conroy, Judith; Casey, Jillian; Green, Andrew; Segurado, Ricardo; Shah, Naisha; Ennis, Sean; et al.
Abstract:
The autism spectrum disorders (ASDs) are a group of conditions characterized by impairments in reciprocal social interaction and communication, and the presence of restricted and repetitive behaviours1. Individuals with an ASD vary greatly in cognitive development, which can range from above average to intellectual disability2. Although ASDs are known to be highly heritable (~90%)3, the underlying genetic determinants are still largely unknown. Here we analysed the genome-wide characteristics of rare (<1% frequency) copy number variation in ASD using dense genotyping arrays. When comparing 996 ASD individuals of European ancestry to 1,287 matched controls, cases were found to carry a higher global burden of rare, genic copy number variants (CNVs) (1.19 fold, P = 0.012), especially so for loci previously implicated in either ASD and/or intellectual disability (1.69 fold, P = 3.4 × 10-4). Among the CNVs there were numerous de novo and inherited events, sometimes in combination in a...
http://hdl.handle.net/10197/4381
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Genomic insights into the population structure and history of the Irish Travellers.
(2017)
Gilbert, Edmund; Carmi, Shai; Ennis, Sean; Wilson, James F; Cavalleri, Gianpiero L
Genomic insights into the population structure and history of the Irish Travellers.
(2017)
Gilbert, Edmund; Carmi, Shai; Ennis, Sean; Wilson, James F; Cavalleri, Gianpiero L
Abstract:
<p>The original article is available at www.nature.com</p>
<p>The Irish Travellers are a population with a history of nomadism; consanguineous unions are common and they are socially isolated from the surrounding, 'settled' Irish people. Low-resolution genetic analysis suggests a common Irish origin between the settled and the Traveller populations. What is not known, however, is the extent of population structure within the Irish Travellers, the time of divergence from the general Irish population, or the extent of autozygosity. Using a sample of 50 Irish Travellers, 143 European Roma, 2232 settled Irish, 2039 British and 6255 European or world-wide individuals, we demonstrate evidence for population substructure within the Irish Traveller population, and estimate a time of divergence before the Great Famine of 1845-1852. We quantify the high levels of autozygosity, which are comparable to levels previously described in Orcadian 1(st)/2(nd) cousin of...
https://epubs.rcsi.ie/mctart/85
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Identification of a mutation in LARS as a novel cause of infantile hepatopathy
(2014)
Casey, Jillian; McGettigan, Paul A.; Lynam-Lennon, Niamh; Regan, Regina; Conroy, Judith...
Identification of a mutation in LARS as a novel cause of infantile hepatopathy
(2014)
Casey, Jillian; McGettigan, Paul A.; Lynam-Lennon, Niamh; Regan, Regina; Conroy, Judith; Bourke, Billy; Lynch, Sally; Ennis, Sean; et al.
Abstract:
Infantile hepatopathies are life-threatening liver disorders that manifest in the first few months of life. We report on a consanguineous Irish Traveller family that includes six individuals presenting with acute liver failure in the first few months of life. Additional symptoms include anaemia, renal tubulopathy, developmental delay, seizures, failure to thrive and deterioration of liver function with minor illness. The multisystem manifestations suggested a possible mitochondrial basis to the disorder. However, known causes of childhood liver failure and mitochondrial disease were excluded in this family by biochemical, metabolic and genetic analyses. We aimed to identify the underlying risk gene using homozygosity mapping and whole exome sequencing. SNP homozygosity mapping identified a candidate locus at 5q31.3–q33.1. Whole exome sequencing identified 1 novel homozygous missense mutation within the 5q31.3–q33.1 candidate region that segregated with the hepatopathy. The candidate...
http://hdl.handle.net/10197/5794
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Recessive mutations in MCM4/PRKDC cause a novel syndrome involving a primary immunodeficiency and a disorder of DNA repair
(2014)
Casey, Jillian; Nobbs, Michael; McGettigan, Paul A.; Ennis, Sean; et al.
Recessive mutations in MCM4/PRKDC cause a novel syndrome involving a primary immunodeficiency and a disorder of DNA repair
(2014)
Casey, Jillian; Nobbs, Michael; McGettigan, Paul A.; Ennis, Sean; et al.
Abstract:
Background: A study is presented of 10 children with a novel syndrome born to consanguineous parents from the Irish Traveller population. The syndrome is characterised by a natural killer (NK) cell deficiency, evidence of an atypical Fanconi's type DNA breakage disorder, and features of familial glucocorticoid deficiency (FGD). The NK cell deficiency probably accounts for the patients' recurrent viral illnesses. Molecular tests support a diagnosis of mosaic Fanconi's anaemia, but the patients do not present with any of the expected clinical features of the disorder. The symptomatic presentation of FGD was delayed in onset and may be a secondary phenotype. As all three phenotypes segregate together, the authors postulated that the NK cell deficiency, DNA repair disorder and FGD were caused by a single recessive genetic event.Methods: Single-nucleotide polymorphism homozygosity mapping and targeted next-generation sequencing of 10 patients and 16 unaffected relatives. R...
http://hdl.handle.net/10197/6162
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Tdp2 protects transcription from abortive topoisomerase activity and is required for normal neural function
(2018)
Gómez-Herreros, Fernando; Schuurs-Hoeijmakers, Janneke H M; McCormack, Mark; Greally, M...
Tdp2 protects transcription from abortive topoisomerase activity and is required for normal neural function
(2018)
Gómez-Herreros, Fernando; Schuurs-Hoeijmakers, Janneke H M; McCormack, Mark; Greally, Marie T; Rulten, Stuart; Romero-Granados, Rocío; Counihan, Timothy J; Chaila, Elijah; Conroy, Judith; Ennis, Sean; Delanty, Norman; Cortés-Ledesma, Felipe; de Brouwer, Arjan P M; Cavalleri, Gianpiero L; El-Khamisy, Sherif F; de Vries, Bert B A; Caldecott, Keith W
Abstract:
Topoisomerase II (TOP2) removes torsional stress from DNA and facilitates gene transcription by introducing transient DNA double-strand breaks (DSBs). Such DSBs are normally rejoined by TOP2 but on occasion can become abortive and remain unsealed. Here we identify homozygous mutations in the TDP2 gene encoding tyrosyl DNA phosphodiesterase-2, an enzyme that repairs 'abortive' TOP2-induced DSBs, in individuals with intellectual disability, seizures and ataxia. We show that cells from affected individuals are hypersensitive to TOP2-induced DSBs and that loss of TDP2 inhibits TOP2-dependent gene transcription in cultured human cells and in mouse post-mitotic neurons following abortive TOP2 activity. Notably, TDP2 is also required for normal levels of many gene transcripts in developing mouse brain, including numerous gene transcripts associated with neurological function and/or disease, and for normal interneuron density in mouse cerebellum. Collectively, these data implicate...
http://hdl.handle.net/10379/11689
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The Irish DNA Atlas: Revealing Fine-Scale Population Structure and History within Ireland
(2017)
Gilbert, Edmund; O'Reilly, Seamus; Merrigan, Michael; McGettigan, Darren; Molloy, ...
The Irish DNA Atlas: Revealing Fine-Scale Population Structure and History within Ireland
(2017)
Gilbert, Edmund; O'Reilly, Seamus; Merrigan, Michael; McGettigan, Darren; Molloy, Anne M; Brody, Lawrence C; Bodmer, Walter; Hutnik, Katarzyna; Ennis, Sean; Lawson, Daniel J; Wilson, James F; Cavalleri, Gianpiero L
Abstract:
<p>This article is also available at <a href="https://www.nature.com/articles/s41598-017-17124-4?WT.feed_name=subjects_population-genetics">https://www.nature.com/articles/s41598-017-17124-4?WT.feed_name=subjects_population-genetics</a></p>
<p>The extent of population structure within Ireland is largely unknown, as is the impact of historical migrations. Here we illustrate fine-scale genetic structure across Ireland that follows geographic boundaries and present evidence of admixture events into Ireland. Utilising the ‘Irish DNA Atlas’, a cohort (n = 194) of Irish individuals with four generations of ancestry linked to specific regions in Ireland, in combination with 2,039 individuals from the Peoples of the British Isles dataset, we show that the Irish population can be divided in 10 distinct geographically stratified genetic clusters; seven of ‘Gaelic’ Irish ancestry, and three of shared Irish-British ancestry. In addition we observe a m...
https://epubs.rcsi.ie/mctart/89
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Towards an understanding of marketing planning practices in indigenous small firms in the electronics sector in the republic of Ireland
(1997)
Ennis, Sean
Towards an understanding of marketing planning practices in indigenous small firms in the electronics sector in the republic of Ireland
(1997)
Ennis, Sean
Abstract:
This thesis examines the role which marketing plays in the planning process of small indigenous companies in the electronics sector in the Republic of Ireland. In particular it attempts to identify the main influencing factors which shape the particular approach adopted by such firms. The research involved a comprehensive review of the literature on small business policy in Ireland, entrepreneurship, growth and the small firm, and also strategy and planning. A pluralistic approach to the design of the research programme was adopted. This involved three phases; consisting of in - depth interviews, telephone interviews and final seven detailed case studies of electronics firms. The quantitative phase showed that there was a strong relationship between the size of the customer base and the tendency to adopt an informal, intuitive approach to planning. Likewise there was evidence to suggest that the size of the company (defined as the number of employees) also influences the approach ...
http://doras.dcu.ie/18690/
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Unexpected genetic heterogeneity for primary ciliary dyskinesia in the Irish Traveller population
(2014)
Casey, Jillian; McGettigan, Paul A.; Healy, Fiona; Reynolds, Alison; Kennedy, Breandán;...
Unexpected genetic heterogeneity for primary ciliary dyskinesia in the Irish Traveller population
(2014)
Casey, Jillian; McGettigan, Paul A.; Healy, Fiona; Reynolds, Alison; Kennedy, Breandán; Ennis, Sean; Slattery, Dubhfeasa; Lynch, Sally; Hogg, Claire
Abstract:
We present a study of five children from three unrelated Irish Traveller families presenting with primary ciliary dyskinesia (PCD). As previously characterized disorders in the Irish Traveller population are caused by common homozygous mutations, we hypothesised that all three PCD families shared the same recessive mutation. However, exome sequencing showed that there was no pathogenic homozygous mutation common to all families. This finding was supported by histology, which showed that each family has a different type of ciliary defect; transposition defect (family A), nude epithelium (family B) and absence of inner and outer dynein arms (family C). Therefore, each family was analysed independently using homozygosity mapping and exome sequencing. The affected siblings in family A share a novel 1 bp duplication in RSPH4A (NM_001161664.1:c.166dup; p.Arg56Profs*11), a radial-spoke head protein involved in ciliary movement. In family B, we identified three candidate genes (CCNO, KCNN3 ...
http://hdl.handle.net/10197/5688
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