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2.
  • Hammarsjö, A., et al. (författare)
  • High diagnostic yield in skeletal ciliopathies using massively parallel genome sequencing, structural variant screening and RNA analyses
  • 2021
  • Ingår i: Journal of Human Genetics. - : Springer Nature. - 1434-5161 .- 1435-232X. ; 66:10, s. 995-1008
  • Tidskriftsartikel (refereegranskat)abstract
    • Skeletal ciliopathies are a heterogenous group of disorders with overlapping clinical and radiographic features including bone dysplasia and internal abnormalities. To date, pathogenic variants in at least 30 genes, coding for different structural cilia proteins, are reported to cause skeletal ciliopathies. Here, we summarize genetic and phenotypic features of 34 affected individuals from 29 families with skeletal ciliopathies. Molecular diagnostic testing was performed using massively parallel sequencing (MPS) in combination with copy number variant (CNV) analyses and in silico filtering for variants in known skeletal ciliopathy genes. We identified biallelic disease-causing variants in seven genes: DYNC2H1, KIAA0753, WDR19, C2CD3, TTC21B, EVC, and EVC2. Four variants located in non-canonical splice sites of DYNC2H1, EVC, and KIAA0753 led to aberrant splicing that was shown by sequencing of cDNA. Furthermore, CNV analyses showed an intragenic deletion of DYNC2H1 in one individual and a 6.7 Mb de novo deletion on chromosome 1q24q25 in another. In five unsolved cases, MPS was performed in family setting. In one proband we identified a de novo variant in PRKACA and in another we found a homozygous intragenic deletion of IFT74, removing the first coding exon and leading to expression of a shorter message predicted to result in loss of 40 amino acids at the N-terminus. These findings establish IFT74 as a new skeletal ciliopathy gene. In conclusion, combined single nucleotide variant, CNV and cDNA analyses lead to a high yield of genetic diagnoses (90%) in a cohort of patients with skeletal ciliopathies.
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6.
  • Fergelot, Patricia, et al. (författare)
  • Phenotype and genotype in 52 patients with Rubinstein–Taybi syndrome caused by EP300 mutations
  • 2016
  • Ingår i: American Journal of Medical Genetics. Part A. - : John Wiley & Sons Inc.. - 1552-4825 .- 1552-4833. ; 170:12, s. 3069-3082
  • Tidskriftsartikel (refereegranskat)abstract
    • Rubinstein–Taybi syndrome (RSTS) is a developmental disorder characterized by a typical face and distal limbs abnormalities, intellectual disability, and a vast number of other features. Two genes are known to cause RSTS, CREBBP in 60% and EP300 in 8–10% of clinically diagnosed cases. Both paralogs act in chromatin remodeling and encode for transcriptional co-activators interacting with >400 proteins. Up to now 26 individuals with an EP300 mutation have been published. Here, we describe the phenotype and genotype of 42 unpublished RSTS patients carrying EP300 mutations and intragenic deletions and offer an update on another 10 patients. We compare the data to 308 individuals with CREBBP mutations. We demonstrate that EP300 mutations cause a phenotype that typically resembles the classical RSTS phenotype due to CREBBP mutations to a great extent, although most facial signs are less marked with the exception of a low-hanging columella. The limb anomalies are more similar to those in CREBBP mutated individuals except for angulation of thumbs and halluces which is very uncommon in EP300 mutated individuals. The intellectual disability is variable but typically less marked whereas the microcephaly is more common. All types of mutations occur but truncating mutations and small rearrangements are most common (86%). Missense mutations in the HAT domain are associated with a classical RSTS phenotype but otherwise no genotype–phenotype correlation is detected. Pre-eclampsia occurs in 12/52 mothers of EP300 mutated individuals versus in 2/59 mothers of CREBBP mutated individuals, making pregnancy with an EP300 mutated fetus the strongest known predictor for pre-eclampsia.
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  • Bolte, S., et al. (författare)
  • The Roots of Autism and ADHD Twin Study in Sweden (RATSS)
  • 2014
  • Ingår i: Twin Research and Human Genetics. - Stockholm : Karolinska Institutet, Dept of Medical Epidemiology and Biostatistics. - 1832-4274. ; 17:3, s. 164-176
  • Tidskriftsartikel (refereegranskat)abstract
    • Neurodevelopmental disorders affect a substantial minority of the general population. Their origins are still largely unknown, but a complex interplay of genetic and environmental factors causing disturbances of the central nervous system's maturation and a variety of higher cognitive skills is presumed. Only limited research of rather small sample size and narrow scope has been conducted in neurodevelopmental disorders using a twin-differences design. The Roots of Autism and ADHD Twin Study in Sweden (RATSS) is an ongoing project targeting monozygotic twins discordant for categorical or dimensional autistic and inattentive/hyperactive-impulsive phenotypes as well as other neurodevelopmental disorders, and typically developing twin controls. Included pairs are 9 years of age or older, and comprehensively assessed for psychopathology, medical history, neuropsychology, and dysmorphology, as well as structural, functional, and molecular brain imaging. Specimens are collected for induced pluripotent (iPS) and neuroepithelial stem cells, genetic, gut bacteria, protein-/monoamine, and electron microscopy analyses. RATSS's objective is to generate a launch pad for novel surveys to understand the complexity of genotype-environment-phenotype interactions in autism spectrum disorder and attention-deficit hyperactivity disorder (ADHD). By October 2013, RATSS had collected data from 55 twin pairs, among them 10 monozygotic pairs discordant for autism spectrum disorder, seven for ADHD, and four for other neurodevelopmental disorders. This article describes the design, recruitment, data collection, measures, collected pairs' characteristics, as well as ongoing and planned analyses in RATSS. Potential gains of the study comprise the identification of environmentally mediated biomarkers, the emergence of candidates for drug development, translational modeling, and new leads for prevention of incapacitating outcomes.
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  • Khodorkovskii, M. A., et al. (författare)
  • Electronic spectra of ArXe molecules in the region of Xe* (5d, 7s, 7p, 6p '), 80 300-89 500 cm(-1), using resonantly enhanced multiphoton ionization
  • 2010
  • Ingår i: Journal of Physics B. - 0953-4075 .- 1361-6455. ; 43:23, s. 235101-
  • Tidskriftsartikel (refereegranskat)abstract
    • The electronic spectra of ArXe molecules in the 80 300-89 500 cm(-1) region were recorded by (2 + n) and (3 + n) REMPI methods. The vibrational progressions attributed to transitions of molecules from the ground state to the bounded excited state and wide unstructured bands related to transitions to the continuous upper state were obtained. The molecular constants of ArXe* were calculated for all the observed progressions in the 80 300-87 000 cm(-1) region as an approximation of an anharmonic oscillator and the Morse potential. For different excited states the energy of harmonic oscillator and the dissociation energy are changed from 10 to 100 cm(-1) and from 70 to 750 cm(-1), respectively.
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10.
  • Khodorkovskii, M. A., et al. (författare)
  • Electronic spectra of ArXe molecules in the region of Xe* (6s ', 6p, 5d), 77 000-80 200 cm(-1), using resonantly enhanced multiphoton ionization
  • 2010
  • Ingår i: Journal of Physics B. - 0953-4075 .- 1361-6455. ; 43:15, s. 155101-
  • Tidskriftsartikel (refereegranskat)abstract
    • The excited electronic states of ArXe molecules in the region 77 000-80 200 cm(-1) were studied using the (2+1) and (3+1) resonance-enhanced multiphoton ionization methods. The use of different methods of multi-photon excitation and Ar+ ion registration allowed us to obtain some new data. Molecular constants were obtained for previously unknown excited states of molecules with the following dissociation limits: ArXe* -> (ArS0)-S-1+Xe*6p[5/2](3) with Omega = 2, 3 symmetry; (ArS0)-S-1+Xe*6p[3/2](2) with Omega = 1, 2 symmetry; (XeS1)-S-0 -> Xe*6s'[1/2](1)(0) with Omega = 0(+) symmetry.
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