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Filges I, Bruder E, Brandal K, Meier S, Undlien DE, Waage TR, Hoesli I, Schubach M, de Beer T, Sheng Y, Hoeller S, Schulzke S, Røsby O, Miny P, Tercanli S, Oppedal T, Meyer P, Selmer KK, Strømme P. Strømme Syndrome Is a Ciliary Disorder Caused by Mutations in CENPF. Hum Mutat 2016; 37:711. [DOI: 10.1002/humu.22997] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Isabel Filges
- Medical Genetics; University Hospital Basel; Basel Switzerland
| | | | - Kristin Brandal
- Department of Medical Genetics; Oslo University Hospital and University of Oslo; Oslo Norway
| | - Stephanie Meier
- Medical Genetics; University Hospital Basel; Basel Switzerland
| | - Dag Erik Undlien
- Department of Medical Genetics; Oslo University Hospital and University of Oslo; Oslo Norway
| | - Trine Rygvold Waage
- Section of Paediatric Neurohabilitation; Department of Clinical Neurosciences for Children; Oslo University Hospital; Ullevål, Oslo Norway
| | - Irene Hoesli
- Obstetrics and Gynecology; University Hospital Basel; Basel Switzerland
| | - Max Schubach
- Institute for Medical and Human Genetics; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - Tjaart de Beer
- Biozentrum and Swiss Institute of Bioinformatics; University of Basel; Basel Switzerland
| | - Ying Sheng
- Department of Medical Genetics; Oslo University Hospital and University of Oslo; Oslo Norway
| | | | - Sven Schulzke
- Neonatology; University Children's Hospital Basel; Basel Switzerland
| | - Oddveig Røsby
- Department of Medical Genetics; Oslo University Hospital and University of Oslo; Oslo Norway
| | - Peter Miny
- Medical Genetics; University Hospital Basel; Basel Switzerland
| | | | - Truls Oppedal
- Department of Ophthalmology; Section for Pediatric Ophthalmology; Oslo University Hospital; Ullevål, Oslo Norway
| | - Peter Meyer
- Pathology; University Hospital Basel; Basel Switzerland
| | - Kaja Kristine Selmer
- Department of Medical Genetics; Oslo University Hospital and University of Oslo; Oslo Norway
| | - Petter Strømme
- Section for Clinical Neurosciences; Department of Pediatrics; Oslo University Hospital and University of Oslo; Oslo Norway
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Filges I, Bruder E, Brandal K, Meier S, Undlien DE, Waage TR, Hoesli I, Schubach M, de Beer T, Sheng Y, Hoeller S, Schulzke S, Røsby O, Miny P, Tercanli S, Oppedal T, Meyer P, Selmer KK, Strømme P. Strømme Syndrome Is a Ciliary Disorder Caused by Mutations in CENPF. Hum Mutat 2016; 37:359-63. [PMID: 26820108 DOI: 10.1002/humu.22960] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 01/08/2016] [Indexed: 11/10/2022]
Abstract
Strømme syndrome was first described by Strømme et al. (1993) in siblings presenting with "apple peel" type intestinal atresia, ocular anomalies and microcephaly. The etiology remains unknown to date. We describe the long-term clinical follow-up data for the original pair of siblings as well as two previously unreported siblings with a severe phenotype overlapping that of the Strømme syndrome including fetal autopsy results. Using family-based whole-exome sequencing, we identified truncating mutations in the centrosome gene CENPF in the two nonconsanguineous Caucasian sibling pairs. Compound heterozygous inheritance was confirmed in both families. Recently, mutations in this gene were shown to cause a fetal lethal phenotype, the phenotype and functional data being compatible with a human ciliopathy [Waters et al., 2015]. We show for the first time that Strømme syndrome is an autosomal-recessive disease caused by mutations in CENPF that can result in a wide phenotypic spectrum.
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Affiliation(s)
- Isabel Filges
- Medical Genetics, University Hospital Basel, Basel, Switzerland
| | | | - Kristin Brandal
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Stephanie Meier
- Medical Genetics, University Hospital Basel, Basel, Switzerland
| | - Dag Erik Undlien
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Trine Rygvold Waage
- Section of Paediatric Neurohabilitation, Department of Clinical Neurosciences for Children, Oslo University Hospital, Ullevål, Oslo, Norway
| | - Irene Hoesli
- Obstetrics and Gynecology, University Hospital Basel, Basel, Switzerland
| | - Max Schubach
- Institute for Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Tjaart de Beer
- Biozentrum and Swiss Institute of Bioinformatics, University of Basel, Basel, Switzerland
| | - Ying Sheng
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Sylvia Hoeller
- Pathology, University Hospital Basel, Basel, Switzerland
| | - Sven Schulzke
- Neonatology, University Children's Hospital Basel, Basel, Switzerland
| | - Oddveig Røsby
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Peter Miny
- Medical Genetics, University Hospital Basel, Basel, Switzerland
| | | | - Truls Oppedal
- Department of Ophthalmology, Section for Pediatric Ophthalmology, Oslo University Hospital, Ullevål, Oslo, Norway
| | - Peter Meyer
- Pathology, University Hospital Basel, Basel, Switzerland
| | - Kaja Kristine Selmer
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Petter Strømme
- Section for Clinical Neurosciences, Department of Pediatrics, Oslo University Hospital and University of Oslo, Oslo, Norway
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Rønningen KS, Yap SE, Brandal K, Stormyr A, Lie BA, Rasmussen T, Stray-Pedersen B, Akselsen HE. HLA-DRB1, -DQA1 and -DQB1 Alleles and Haplotypes in First-Generation Pakistani Immigrants in Norway. Scand J Immunol 2012; 75:426-30. [DOI: 10.1111/j.1365-3083.2011.02669.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Selmer KK, Gilfillan GD, Strømme P, Lyle R, Hughes T, Hjorthaug HS, Brandal K, Nakken S, Misceo D, Egeland T, Munthe LA, Braekken SK, Undlien DE. A mild form of Mucopolysaccharidosis IIIB diagnosed with targeted next-generation sequencing of linked genomic regions. Eur J Hum Genet 2011; 20:58-63. [PMID: 21712855 DOI: 10.1038/ejhg.2011.126] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Next-generation sequencing (NGS) techniques have already shown their potential in the identification of mutations underlying rare inherited disorders. We report here the application of linkage analysis in combination with targeted DNA capture and NGS to a Norwegian family affected by an undiagnosed mental retardation disorder with an autosomal recessive inheritance pattern. Linkage analysis identified two loci on chromosomes 9 and 17 which were subject to target enrichment by hybridization to a custom microarray. NGS achieved 20-fold or greater sequence coverage of 83% of all protein-coding exons in the target regions. This led to the identification of compound heterozygous mutations in NAGLU, compatible with the diagnosis of Mucopolysaccharidosis IIIB (MPS IIIB or Sanfilippo Syndrome type B). This diagnosis was confirmed by demonstrating elevated levels of heparan sulphate in urine and low activity of α-N-acetyl-glucosaminidase in cultured fibroblasts. Our findings describe a mild form of MPS IIIB and illustrate the diagnostic potential of targeted NGS in Mendelian disease with unknown aetiology.
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Affiliation(s)
- Kaja K Selmer
- Department and Institute of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
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Selmer KK, Grøndahl J, Riise R, Brandal K, Braaten Ø, Bragadottir R, Undlien DE. Autosomal dominant pericentral retinal dystrophy caused by a novel missense mutation in the TOPORS gene. Acta Ophthalmol 2010; 88:323-8. [PMID: 19183411 DOI: 10.1111/j.1755-3768.2008.01465.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
PURPOSE This study aimed to identify the genetic cause of autosomal dominant pericentral retinal dystrophy (adPRD) in a large Norwegian family with 35 affected members. METHODS The family was characterized by clinical ophthalmological examination along with fundus photography, dark adaptometry and electroretinography. We performed a genome-wide linkage analysis followed by sequencing of a candidate gene to identify the mutation causing the disease. RESULTS The ophthalmological examinations revealed an atypical form of retinitis pigmentosa (RP), which we prefer to call adPRD. Compared with classical RP, this phenotype has a favourable prognosis. Linkage analysis showed a linkage peak covering the most recently reported adRP gene TOPORS. This gene was sequenced in 19 family members and a novel missense mutation, c.1205a>c, resulting in an amino acid substitution p.Q402P, was detected in all affected members. The mutation showed complete co-segregation with the disease in this family, with a LOD score of 7.3. It is located in a highly conserved region and alignment with the appropriate DNA sequence from other species shows complete conservation of this amino acid. The mutation was not detected in 207 healthy, unrelated controls of Norwegian origin. CONCLUSIONS We present a novel mutation in the TOPORS gene co-segregating with a distinct phenotype of adPRD in a large Norwegian family.
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Selmer KK, Lund C, Brandal K, Undlien DE, Brodtkorb E. SCN1A mutation screening in adult patients with Lennox-Gastaut syndrome features. Epilepsy Behav 2009; 16:555-7. [PMID: 19782004 DOI: 10.1016/j.yebeh.2009.08.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 08/20/2009] [Accepted: 08/21/2009] [Indexed: 11/24/2022]
Abstract
Mutations in the SCN1A gene have been identified in a variety of epilepsy phenotypes, from severe encephalopathies such as Dravet syndrome to milder familial forms such as generalized epilepsy with febrile seizures plus. In a previous study, an SCN1A mutation was also identified in a patient with Lennox-Gastaut syndrome (LGS), and the aim of our study was to investigate the importance of mutations in the SCN1A gene in Norwegian patients with clinical features of LGS. We screened 22 adult patients for SCN1A mutations by direct sequencing of DNA and for micro-rearrangements with multiplex ligation-dependent probe amplification. In one patient a mutation was found, which demonstrates a clinical overlap between LGS and Dravet syndrome. This finding emphasizes the significance of SCN1A mutations also in epileptic disorders with features of LGS, particularly in the myoclonic variant of the disorder.
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Abstract
Different SCN1A mutations are known to cause a variety of phenotypes, such as generalized epilepsy with febrile seizures plus (GEFS+), Dravet syndrome and familial hemiplegic migraine (FHM). In Dravet syndrome, most mutations are de novo and familial cases are rare. In this study, Dravet syndrome is observed in two maternal half sisters. They have healthy fathers and their common mother has never experienced seizures, but has a lifelong history of migraine. Direct sequencing of DNA extracted from blood revealed a heterozygous SCN1A nonsense mutation c.3985C>T in the sisters, but not in the mother. The mutation induces a premature stop codon and probably leads to a non-functional protein. Further examination of the mother's DNA showed that she has a mosaicism of the mutation. This report of parental SCN1A nonsense mutation mosaicism in familial Dravet syndrome suggests that mosaicism might be more common than previously suspected and emphasizes the importance of taking mosaicism into account in genetic counselling of Dravet syndrome and SCN1A mutations. Furthermore, whether the migraine of the mother could be influenced by her SCN1A mutation mosaicism is not known, but increased awareness of migraine in future studies of SCN1A related epilepsies could clarify this intriguing link between migraine and epilepsy.
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Affiliation(s)
- K K Selmer
- Department of Medical Genetics, Oslo University Hospital, Ullevaal Hospital, Oslo, Norway.
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Abstract
Single nucleotide polymorphisms (SNPs) have recently replaced microsatellites as the genetic markers of choice in linkage analysis, primarily because they are more abundant and the genotypes more amenable for automatic calling. One of the most recently launched linkage mapping sets (LMS) is the Applied Biosystems Human LMS 4K, which is a genome-wide linkage set based on the SNPlex™ technology and the use of clustered SNPs. In this article the authors report on their experience with this set and the associated genotyping software GeneMapper® version 4.0, which they have used for linkage analyses in 17 moderate to large families with assumed monogenic disease. For comparison of methods, they also performed a genome-wide linkage analysis in 1 of the 17 families using the Affymetrix GeneChip® Human Mapping 10K 2.0 array. The conclusion is that both methods performed technically well, with high call rates and comparable and low rates of Mendelian inconsistencies. However, genotyping is less automated in GeneMapper® version 4.0 than in the Affymetrix software and thus more time consuming. ( Journal of Biomolecular Screening 2009:92-96)
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Affiliation(s)
- Kaja K. Selmer
- Institute of Medical Genetics, University of Oslo, Oslo, Norway, Department of Medical Genetics, UllevÅl University Hospital, Oslo, Norway,
| | - Kristin Brandal
- Institute of Medical Genetics, University of Oslo, Oslo, Norway
| | - Ole K. Olstad
- Department of Clinical Chemistry, UllevÅl University Hospital, Oslo, Norway
| | - Bård Birkenes
- Institute of Medical Genetics, University of Oslo, Oslo, Norway
| | - Dag E. Undlien
- Institute of Medical Genetics, University of Oslo, Oslo, Norway, Department of Medical Genetics, UllevÅl University Hospital, Oslo, Norway
| | - Thore Egeland
- Department of Medical Genetics, UllevÅl University Hospital, Oslo, Norway, Oslo University College, Oslo, Norway
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Selmer KK, Egeland T, Solaas MH, Nakken KO, Kjeldsen MJ, Friis ML, Brandal K, Corey LA, Undlien DE. Comment. Acta Neurol Scand 2008. [DOI: 10.1111/j.1600-0404.2008.01061.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Skinningsrud B, Husebye ES, Pearce SH, McDonald DO, Brandal K, Wolff AB, Løvås K, Egeland T, Undlien DE. Polymorphisms in CLEC16A and CIITA at 16p13 are associated with primary adrenal insufficiency. J Clin Endocrinol Metab 2008; 93:3310-7. [PMID: 18593762 DOI: 10.1210/jc.2008-0821] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT/OBJECTIVES It is known that different autoimmune diseases often share the same susceptibility genes. In this study we aimed to investigate if loci found associated with common autoimmune diseases in recent genome-wide association studies also could be susceptibility loci for autoimmune Addison's disease (primary adrenal insufficiency). DESIGN/PATIENTS A total of 139 tagging single nucleotide polymorphisms (SNPs) in 11 candidate genes (IL2, IL21, IL2RA, CLEC2D, CD69, ERBB3, PTPN11, SH2B3, CLEC16A, CIITA, and PTPN2) were genotyped in a case/control study design consisting of Norwegian Addison's disease patients (n = 332) and Norwegian healthy control individuals (n = 1029). Five SNPs were subsequently selected for analysis in a United Kingdom sample set consisting of Addison's disease patients (n = 210) and controls (n = 191). RESULTS Polymorphisms in CLEC16A and CIITA remained significantly associated with Addison's disease in the Norwegian sample set at the 0.05 level, even after correction for multiple testing. CLEC16A and CIITA are both located at 16p13, but linkage disequilibrium patterns and logistical regression analyses suggest that SNPs in these two genes are independently associated with Addison's disease. We were not able to confirm these associations in the United Kingdom material, however, this may well be due to the limited sample size and lack of statistical power. CONCLUSION Two alleles at 16p13 are independently associated with the risk of Addison's disease in the Norwegian population, suggesting this chromosomal region to harbor common autoimmunity gene(s), CLEC16A and CIITA being possible independent candidates.
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Affiliation(s)
- Beate Skinningsrud
- Department of Medical Genetics, Ullevål University Hospital, University of Oslo, Kirkeveien 166, N-0407 Oslo, Norway.
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Selmer KK, Egeland T, Solaas MH, Nakken KO, Kjeldsen MJ, Friis ML, Brandal K, Corey LA, Undlien DE. Genetic screening of Scandinavian families with febrile seizures and epilepsy or GEFS+. Acta Neurol Scand 2008; 117:289-92. [PMID: 17927801 DOI: 10.1111/j.1600-0404.2007.00941.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND Mutations in the three genes SCN1A, SCN1B and GABRG2, all encoding subunits of ion channels, have been known to cause generalized epilepsy with febrile seizures plus (GEFS+) in families of different origin. OBJECTIVE To study the occurrence of mutations in these genes in families with GEFS+ or a GEFS+ resembling phenotype of Scandinavian origin. MATERIAL AND METHODS We performed linkage analysis in 19 Scandinavian families with a history of febrile seizures (FS) and epilepsy or GEFS+. Where linkage could not be excluded, the genes of interest were sequenced. RESULTS We identified only one mutation in SCN1A, which seems to be a rare variant with no functional consequence. CONCLUSION This suggests that mutations in these three genes are not a prevalent cause of familial cases of FS and epilepsy or GEFS+ in Scandinavia.
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Affiliation(s)
- K K Selmer
- Institute of Medical Genetics, Faculty Division Ullevål University Hospital, University of Oslo, Oslo, Norway.
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Tjeldhorn L, Rand-Hendriksen S, Gervin K, Brandal K, Inderhaug E, Geiran O, Paus B. Rapid and efficient FBN1 mutation detection using automated sample preparation and direct sequencing as the primary strategy. ACTA ACUST UNITED AC 2007; 10:258-64. [PMID: 17253931 DOI: 10.1089/gte.2006.258-264] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Mutations in the fibrillin-1 (FBN1) gene cause Marfan syndrome (MFS) and the other type-1 fibrillinopathies. Finding these mutations is a major challenge considering that the FBN1 gene has a coding region of 8,600 base pairs divided into 65 exons. Most of the more than 600 known mutations have been identified using a mutation scanning method prior to sequencing of fragments with a suspected mutation. However, it is not obvious that these screening methods are ideal, considering cost, efficiency, and sensitivity. We have sequenced the entire FBN1 coding sequence and flanking intronic sequences in samples from 105 patients with suspected MFS, taking advantage of robotic devices, which reduce the cost of supplies and the quantity of manual work. In addition, automation avoids many tedious steps, thus reducing the opportunity for human error. Automated assembling of PCR, purification of PCR products, and assembly of sequencing reactions resulted in completion of the FBN1 sequence in half of the time needed for the manual protocol. Mutations were identified in 69 individuals. The mutation detection rate (76%), types, and genetic distribution of mutations resemble the findings in other MFS populations. We conclude that automated sequencing using the robotic systems is well suited as a primary strategy for diagnostic mutation identification in FBN1.
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Affiliation(s)
- Lena Tjeldhorn
- Department of Medical Genetics, Ulleval University Hospital, Oslo, Norway
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