Publications by authors named "Malmgren H"

Objective: In moderate-to-severe Graves' orbitopathy, rituximab is recommended as second-line therapy in patients nonresponsive to intravenous glucocorticoids. We aimed to evaluate rituximab as early second-line therapy, as data are scarce and contradictory.

Methods: In this nonrandomized, controlled, interventional study, patients with Graves' orbitopathy started on intravenous glucocorticoids.

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Introduction: Distinguishing paracentric inversions (PAIs) from chromosomal insertions has traditionally relied on fluorescent in situ hybridization (FISH) techniques, but recent advancements in high-throughput sequencing have enabled the use of genome sequencing for such differentiation. In this study, we present a 38-year-old male carrier of a paracentric inversion on chromosome 2q, inv (2)(q31.2q34), whose partner experienced recurrent miscarriages.

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Introduction: Brain calcifications are frequent findings on imaging. In a small proportion of cases, these calcifications are associated with pathogenic gene variants, hence termed primary familial brain calcification (PFBC). The clinical penetrance is incomplete and phenotypic variability is substantial.

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Background: Mood disorders are common in Graves' disease despite treatment. The pathogenic mechanisms involved are unknown and so is whether previous psychiatric disease influences these symptoms.

Methods: This is a longitudinal study conducted in Sweden on 65 women with newly diagnosed Graves' disease and 65 matched controls.

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Article Synopsis
  • - The study aimed to screen for Huntington disease phenocopies in a Swedish group of 73 DNA samples that tested negative for Huntington's disease.
  • - Genetic analyses revealed two patients with spinocerebellar ataxia type 17 and one with an inherited prion disease, along with two cases of myoclonic dystonia and benign hereditary chorea, while no cases of other specific disorders were found.
  • - The findings support previous research and indicate that there may be undiscovered genes contributing to the development of Huntington disease-like symptoms.
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  • Neuromuscular disorders (NMDs) have various causes, and getting a genetic diagnosis is essential for personalized treatment.
  • The study analyzed 861 patients using genome sequencing to identify genetic variants associated with NMDs, finding that 27% had pathogenic variants, with one-third involving short tandem repeats (STRs) and structural variants (SVs).
  • The findings suggest that a comprehensive genome-wide analysis, especially for children with vague symptoms, is more effective than just focusing on specific disease-related genes, emphasizing the need to include STR and SV analyses in NMD diagnostics.
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Objective: Mental fatigue, depression, anxiety, and cognitive complaints are common in Graves' disease (GD). Our aims were to assess the relationship between these variables in patients with GD during both hyperthyroidism and a long stable euthyroidism.

Methods: A prospective longitudinal case-control study where 65 premenopausal women diagnosed with GD and 65 matched controls were assessed twice with 15 months in between.

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Article Synopsis
  • Individuals with intellectual disabilities (ID) and neurodevelopmental disorders (NDD) are assessed using various genetic testing methods, including genome sequencing (GS) and chromosomal microarrays (CMA).
  • A study comparing three diagnostic approaches found that GS as the first test had a 35% diagnostic yield, while GS as a secondary test yielded 26%, and CMA/FMR1 yielded only 11%.
  • The research suggests that GS should be the preferred first-line genetic test for ID/NDD due to its higher effectiveness, lower costs, and potential to provide earlier diagnoses.
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Prader-Willi syndrome (PWS; MIM# 176270) is a neurodevelopmental disorder caused by the loss of expression of paternally imprinted genes within the PWS region located on 15q11.2. It is usually caused by either maternal uniparental disomy of chromosome 15 (UPD15) or 15q11.

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Article Synopsis
  • De novo variants are a significant cause of rare intellectual disabilities and their recurrence risk is usually low, but it might be higher when these variants occur in parental germ cells before fertilization.
  • A study used droplet digital PCR to analyze DNA from blood and sperm of parents with children affected by intellectual disabilities, revealing low-level mosaicism in sperm but not in blood for one case and higher paternal mosaicism in sperm in another.
  • The findings suggest that analyzing sperm can provide a more accurate assessment of germline mosaicism and help inform recurrence risk and genetic counseling for affected families.
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Context: Neuropsychiatric symptoms are common features of Graves disease (GD) in hyperthyroidism and after treatment. The mechanism behind these symptoms is unknown, but reduced hippocampal volumes have been observed in association with increased thyroid hormone levels.

Objective: This work aimed at investigating GD influence on regional medial temporal lobe (MTL) volumes.

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Article Synopsis
  • The study analyzes whole genome sequencing data from 4,437 individuals (3,219 patients and 1,218 relatives) at the Genomic Medicine Center Karolinska-Rare Diseases to advance genomics-based diagnostics in Stockholm's healthcare system.
  • Results show that 40% of patients received a molecular diagnosis, with variation in detection rates among different disease groups and involving 754 different causative genes.
  • The initiative also contributes to research by sharing data internationally, leading to the discovery of 17 new disease-causing genes and fostering collaboration among expert teams for complex cases.
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Approximately half of all cases of Hoyeraal-Hreidarsson syndrome (HHS), a multisystem disorder characterized by bone marrow failure, developmental defects and very short telomeres, are caused by germline mutations in genes related to telomere biology. However, the varying symptoms and severity of the disease indicate that additional mechanisms are involved. Here, a 3-year-old boy with HHS was found to carry biallelic germline mutations in WRAP53 (WD40 encoding RNA antisense to p53), that altered two highly conserved amino acids (L283F and R398W) in the WD40 scaffold domain of the protein encoded.

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Background: Since different types of genetic variants, from single nucleotide variants (SNVs) to large chromosomal rearrangements, underlie intellectual disability, we evaluated the use of whole-genome sequencing (WGS) rather than chromosomal microarray analysis (CMA) as a first-line genetic diagnostic test.

Methods: We analyzed three cohorts with short-read WGS: (i) a retrospective cohort with validated copy number variants (CNVs) (cohort 1, n = 68), (ii) individuals referred for monogenic multi-gene panels (cohort 2, n = 156), and (iii) 100 prospective, consecutive cases referred to our center for CMA (cohort 3). Bioinformatic tools developed include FindSV, SVDB, Rhocall, Rhoviz, and vcf2cytosure.

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Introduction: Cognitive impairment and reduced well-being are common manifestations of Graves' disease (GD). These symptoms are not only prevalent during the active phase of the disease but also often prevail for a long time after hyperthyroidism is considered cured. The pathogenic mechanisms involved in these brain-derived symptoms are currently unknown.

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Background: Friedreich ataxia (FRDA) is the most common familial ataxia syndrome in Central and Southern Europe but rare in Scandinavia. Biallelic mutations in SH3 domain and tetratricopeptide repeats 2 ( cause Charcot-Marie-Tooth disease type 4C (CMT4C), one of the most common autosomal recessive polyneuropathies associated with early onset, slow disease progression and scoliosis. Beyond nystagmus reported in some patients, neither ataxia nor cerebellar atrophy has been documented as part of the CMT4C phenotype.

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We have investigated 20 consanguineous families with multiple children affected by rare disorders. Detailed clinical examinations, exome sequencing of affected as well as unaffected family members and further validation of likely pathogenic variants were performed. In 16/20 families, we identified pathogenic variants in autosomal recessive disease genes (ALMS1, PIGT, FLVCR2, TFG, CYP7B1, ALG14, EXOSC3, MEGF10, ASAH1, WDR62, ASPM, PNPO, ERCC5, KIAA1109, RIPK4, MAN1B1).

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Introduction: Iodine is essential for normal brain development. Moderate and severe fetal iodine deficiency results in substantial to serious developmental delay in children. Mild iodine deficiency in pregnancy is associated with neurodevelopmental deficits in the offspring, but evidence from randomised trials is lacking.

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Study Question: Has PGD-HLA been successful relative to diagnostic and clinical efficacy?

Summary Answer: The diagnostic efficacy of PGD-HLA protocols was found lower in this study in comparison to published PGD-HLA protocols and to that reported for general PGD by ESHRE (78.5 vs 94.1% and vs 92.

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Objectives: The aim of the present study is to determine if the delineation of one or two optimally chosen intracranial areas (ICA) is enough to achieve adequate estimates of intracranial volume (ICV) in magnetic resonance imaging.

Methods: The correlations of 62 fully delineated ICVs with four types of ICV estimates were calculated. The estimate types were: (1) a single midsagittal ICA, (2) single ICA multiplied by the intracranial width perpendicular to the ICA, (3) sum of two ICAs multiplied by the perpendicular intracranial width and (4) shape-preserving piecewise cubic interpolation using two ICAs.

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Paroxysmal Kinesigenic Dyskinesia.

Tremor Other Hyperkinet Mov (N Y)

September 2018

Background: Paroxysmal kinesigenic dyskinesia (PKD) is a rare condition associated with heterozygous mutations in the proline-rich transmembrane protein 2 () gene.

Phenomenology Shown: In this article we illustrate the phenomenology of PKD in a male previously misdiagnosed with Tourette's syndrome.

Educational Value: Regardless of the underlying phenotype, PKD is highly responsive to some antiepileptic drugs.

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Objective: De novo mutations contribute significantly to severe early-onset genetic disorders. Even if the mutation is apparently de novo, there is a recurrence risk due to parental germ line mosaicism, depending on in which gonadal generation the mutation occurred.

Methods: We demonstrate the power of using SMRT sequencing and ddPCR to determine parental origin and allele frequencies of de novo mutations in germ cells in two families whom had undergone assisted reproduction.

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Translocation heterozygotes have an increased risk of producing gametes with unbalanced chromosome content. This often leads to reproductive problems such as infertility, repeated miscarriages or birth of an affected child. To increase the chances of having a healthy live-born child, translocation heterozygotes often opt for preimplantation genetic diagnosis (PGD).

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Purpose: To characterize features associated with de novo mutations affecting SATB2 function in individuals ascertained on the basis of intellectual disability.

Methods: Twenty previously unreported individuals with 19 different SATB2 mutations (11 loss-of-function and 8 missense variants) were studied. Fibroblasts were used to measure mutant protein production.

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Article Synopsis
  • - Ataxia with oculomotor apraxia type 4 (AOA4) is a rare genetic disorder caused by mutations in the PNKP gene, characterized by progressive movement issues and a variety of other symptoms.
  • - The disorder includes hyperkinetic movements, eye movement problems, polyneuropathy, cognitive challenges, and obesity, and has been recently identified in a Portuguese patient group.
  • - A patient with two different PNKP mutations exhibited unique symptoms such as chorea, the absence of oculomotor apraxia, and a slower progression of the disease compared to typical AOA4 cases.
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