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  • 1.
    Lind-Halldén, Christina
    et al.
    Högskolan Kristianstad, Fakulteten för naturvetenskap, Forskningsmiljön Biomedicin. Högskolan Kristianstad, Fakulteten för naturvetenskap, Avdelningen för miljö- och biovetenskap.
    Manderstedt, Eric
    Högskolan Kristianstad, Plattformen för molekylär analys. Högskolan Kristianstad, Fakulteten för naturvetenskap, Avdelningen för miljö- och biovetenskap.
    Carlberg, Daniel
    Högskolan Kristianstad, Fakulteten för naturvetenskap, Forskningsmiljön Biomedicin. Högskolan Kristianstad, Fakulteten för naturvetenskap, Avdelningen för miljö- och biovetenskap.
    Lethagen, Stefan
    Skåne University Hospital in Malmö.
    Halldén, Christer
    Högskolan Kristianstad, Fakulteten för naturvetenskap, Forskningsmiljön Biomedicin. Högskolan Kristianstad, Fakulteten för naturvetenskap, Avdelningen för miljö- och biovetenskap.
    Genetic variation in the syntaxin-binding protein STXBP5 in type 1 von Willebrand disease patients2018Inngår i: Thrombosis and haemostasis, ISSN 2567-689X, Vol. 118, nr 8, s. 1382-1389Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    von Willebrand factor (VWF) levels in healthy individuals and in patients with type 1 von Willebrand disease (VWD) are influenced by genetic variation in several genes, for example, VWF, ABO and STXBP5. Here, we comprehensively screen for STXBP5 variants and investigate their association with type 1 VWD in Swedish patients and controls. The coding region of the STXBP5 gene was re-sequenced in 107 type 1 VWD patients and the detected variants were genotyped in the type 1 VWD population and a Swedish control population (464 individuals). The functional effects of missense alleles were predicted in silico and the pattern of genetic variation in STXBP5 was analysed. Re-sequencing of 107 type 1 VWD patients identified three missense and three synonymous variants in the coding sequence of STXBP5. The low-frequency missense variants rs144099092 (0.005) and rs148830578 (0.029) were predicted to be damaging, but were not accumulated in patients. No other rare candidate mutations were detected. STXBP5 showed a high level of linkage disequilibrium and a low overall nucleotide diversity of π = 3.2 × 10-4 indicating intolerance to variants affecting protein function. Three previously type 1 VWD-associated single nucleotide polymorphisms were located on one haplotype that showed an increased frequency in patients versus controls. No differences in messenger ribonucleic acid abundance among haplotypes could be found using Genotype-Tissue Expression project data. In conclusion, a haplotype containing the STXBP5 Asn436Ser (rs1039084) mutation is associated with type 1 VWD and no rare STXBP5 mutations contribute to type 1 VWD in the Swedish population.

  • 2.
    Mufti, Ahmad H
    et al.
    England.
    Ogiwara, Kenichi
    Canada.
    Swystun, Laura L
    Canada.
    Eikenboom, Jeroen C J
    Nederländerna.
    Budde, Ulrich
    Germany.
    Hopman, Wilma M
    Canada.
    Halldén, C
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Fakulteten för naturvetenskap, Forskningsmiljön Biomedicin.
    Goudemand, Jenny
    France.
    Peake, Ian R
    England.
    Goodeve, Anne C
    England.
    Lillicrap, David
    Canada.
    Hampshire, Daniel J
    England.
    The common VWF single nucleotide variants c.2365A>G and c.2385T>C modify VWF biosynthesis and clearance2018Inngår i: Blood advances, ISSN 2473-9537, Vol. 2, nr 13, s. 1585-1594Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Plasma levels of von Willebrand factor (VWF) vary considerably in the general population and this variation has been linked to several genetic and environmental factors. Genetic factors include 2 common single nucleotide variants (SNVs) located in VWF, rs1063856 (c.2365A>G) and rs1063857 (c.2385T>C), although to date the mechanistic basis for their association with VWF level is unknown. Using genotypic/phenotypic information from a European healthy control population, in vitro analyses of recombinant VWF expressing both SNVs, and in vivo murine models, this study determined the precise nature of their association with VWF level and investigated the mechanism(s) involved. Possession of either SNV corresponded with a significant increase in plasma VWF in healthy controls (P < .0001). In vitro expression confirmed this observation and highlighted an independent effect for each SNV (P < .0001 and P < .01, respectively), despite close proximity and strong linkage disequilibrium between them both. The influence of c.2365A>G on VWF levels was also confirmed in vivo. This increase in VWF protein corresponded to an increase in VWF messenger RNA (mRNA) resulting, in part, from prolonged mRNA half-life. In addition, coinheritance of both SNVs was associated with a lower VWF propeptide-to-VWF antigen ratio in healthy controls (P < .05) and a longer VWF half-life in VWF knockout mice (P < .0001). Both SNVs therefore directly increase VWF plasma levels through a combined influence on VWF biosynthesis and clearance, and may have an impact on disease phenotype in both hemostatic and thrombotic disorders.

  • 3.
    Mårtensson, Annika
    et al.
    Lund University.
    Letelier, A.
    Lund University.
    Halldén, Christer
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Ljung, R.
    Lund University.
    Mutation analysis of Swedish haemophilia B families: high frequency of unique mutations2016Inngår i: Haemophilia, ISSN 1351-8216, E-ISSN 1365-2516, Vol. 22, nr 3, s. 440-445Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    INTRODUCTION: Haemophilia B is caused by a heterogeneous spectrum of mutations. Mutation characterization is important in genetic counselling, prenatal diagnosis and to predict risk of inhibitor development.

    AIMS: To study the mutation spectrum, frequency of unique recurrent mutations, genotype-phenotype association and inhibitor development in a population-based study of the complete Swedish haemophilia B population.

    METHODS: The study included, facilitated by centralized DNA diagnostics, the complete registered Swedish haemophilia B population (113 families: 47 severe, 22 moderate and 44 mild), each represented by a single patient. Mutation characterization was performed by conventional sequencing of all exons and haplotyping by genotyping of single nucleotide variants and microsatellites.

    RESULTS: A mutation was found in every family: eight had large deletions, three had small deletions (<10 base pair) and 102 had single base pair substitutions (69 missense, 26 nonsense, four splice site and three promoter). Ten novel mutations were found and were predicted to be deleterious. Sixteen mutations (one total gene deletion, 14 substitutions and one acceptor splice site) were present in more than one family. Of the single nucleotide mutations (37/102), 36% arose at CpG sites. Haplotyping of families with identical mutations and present analyses showed that the frequency of unique mutations was at least 65%. Inhibitors developed in 9/47 (19%) patients with severe haemophilia B.

    CONCLUSION: The spectrum of haemophilia B mutations reveals at least 65% of the families carry a unique mutation, but with more inhibitor patients than reported internationally, probably as a result of many 'null' mutations.

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