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  • 1
    ISSN: 1433-0474
    Keywords: Schlüsselwörter Faktor-XII-Mangel ; APC-Resistenz ; Faktor-V-Mutation G1691:A ; Hyperhomocysteinämie ; Mutation C677:T im MTHFR-Gen ; von-Willebrand-Erkrankung Typ 1 ; Key words Factor XII deficiency ; APC resistance ; Factor V-mutation G 1691 A ; Hyperhomocysteinemia ; Mutation C 677 T in the MTHFR gene ; von Willebrand’s disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A young woman presenting with marked menstrual blood loss and prolonged bleeding after only minimal injuries was investigated. Because of an extremely prolonged PTT (more than 200 s) we measured the factor XII activity and found a severe deficiency. The bleeding symptoms however could be ascribed to the existence of von Willebrands disease type 1. In addition, the patient had an elevated resistance against activated protein C (APC-resistance) and a moderately elevated concentration of homocysteine in her blood plasma. At the genomic level we found heterozygosity for the factor V mutation G 1691 A and the mutation C 677 T in the methylenetetrahydrofolate reductase (MTHFR)-gene. The analysis of the factor XII gene revealed the existence of a point mutation in the promoter region (G→C transversion, nt–8). The same mutation could be found in the paternal factor XII gene. The low factor XII activity in the woman seems to be the result of a second mutation originating from the maternal factor XII gene (compound heterozygosity). However, this second mutation could not be found up to now. In the sister of the women, a 15 year old girl, there is also a marked menstrual blood loss. The coagulation analysis revealed reduced activities of the factor XII and also von Willebrands disease type 1. The reduced factor XII activity seems to be compatible with the heterozygous state of factor XII deficiency. In the girl there was also an increased APC resistance, corresponding with heterozygosity for the factor V mutation G 1691 A. Mother and father are heterozygous for the factor XII deficiency and the mutation C 677 T in the MTHFR gene. In the mother homozygosity for the mutation in the factor V gene (1691 AA) could be found. All family members investigated exhibited elevated D-dimer concentrations in the plasma. Discussion: It is the aim of this report to give attention to menorrhagias as predominant features of von Willebrand’s disease in females. Furthermore in women with von Willebrand’s disease in combination with inherited risk factors for thrombophilia problems could arise from the use of oral contraceptives and also during pregnancy. In our opinion, physicians, especially paediatricians, who take care of adolescents, should be familiar with such problems.
    Notes: Zusammenfassung Eine junge Frau mit verstärkten Regelblutungen und länger anhaltenden Blutungen aus nur geringgradigen Verletzungen wurde untersucht, wobei eine sehr stark verlängerte PTT ( 〉200 s) auffiel. Die Messung der Faktor-XII-Aktivität ergab mit weniger als 2% einen hochgradigen Mangel. Die angegebenen Blutungssymptome sind jedoch auf eine gleichzeitig bestehende von-Willebrand-Erkrankung Typ 1 zurückzuführen. Zusätzlich waren die APC-Resistenz pathologisch und die Homocysteinkonzentration im Plasma der Patientin erhöht. Auf genomischer Ebene konnten die Mutationen G1691:A im Faktor-V-Gen und C677:T im Methylentetrahydrofolatreduktase(MTHFR)-Gen heterozygot nachgewiesen werden. Die Analyse des Faktor-XII-Gens ergab eine Punktmutation in der Promotorregion (G:C-Transversion, nt–8), die auch im Faktor-XII-Gen des Vaters nachzuweisen ist. Die niedrige Faktor-XII-Aktivität bei der jungen Frau deutet auf die Anwesenheit einer 2. Mutation hin (Compound-Heterozygotie), die sie von ihrer Mutter geerbt haben muß. Diese 2. Mutation ist bis jetzt nicht gefunden worden. Die 15jährige Schwester der Patientin berichtet ebenfalls über verstärkte Regelblutungen. Die Gerinnungsanalyse ergab eine verminderte Faktor-XII-Aktivität und eine von-Willebrand-Erkrankung Typ 1. Die verminderte Faktor-XII-Aktivität ist mit dem heterozygoten Status für diesen Defekt vereinbar. Die erhöht gefundene Resistenz gegenüber APC konnte durch den Nachweis der Mutation G 1691 A im Faktor-V-Gen in heterozygoter Form bestätigt werden. Mutter und Vater der Schwestern sind für den Faktor-XII-Mangel und die Mutation im MTHFR-Gen heterozygot. Bei der Mutter besteht Homozygotie für die Mutation im Faktor-V-Gen (1691 AA). Alle untersuchten Familienmitglieder zeigten erhöhte D-Dimer-Konzentrationen im Plasma. Diskussion: Mit diesem Fallbericht soll auf die Bedeutung der Menorrhagie als häufiges Symptom einer von-Willebrand-Erkrankung hingewiesen werden. Da zusätzlich Risikofaktoren für eine Thrombophilie bestehen, wird auf die Probleme, die den Patientinnen aus der Anwendung oraler Kontrazeptiva entstehen können, ebenso hingewiesen wie auf mögliche Komplikationen im Verlauf einer Schwangerschaft.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 88 (1992), S. 485-485 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 89 (1992), S. 430-432 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A total of 14 unrelated German patients with X-linked iduronate-2-sulfatase (IDS) deficiency (Hunter syndrome, MPS II) showing variable clinical manifestations was screened for structural gene aberrations by Southern analysis. Using the IDS cDNA clone c2S15 as a probe, no Southern fragments could be detected in blots in the severely affected patient G-65 with respect to DNA digested by HindIII, PstI and TaqI, suggesting a total loss of the IDS structural gene. In this patient, the flanking loci DXS 297, DXS 296 and DXS 466 were tested. The locus DXS 466 is involved in the deletion, whereas both of the other loci are present. A normal 9.0-kb fragment disappeared and an aberrant fragment of 3.5 kb occurred in the HindIII blot of patient G-117. A normal Southern pattern was found in PstI and TaqI blots of this patient. This result can be interpreted as the generation of an additional HindIII restriction site by point mutation in an IDS gene intron.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 86 (1990), S. 59-60 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In this brief communication we report a new intergenic polymorphism at DXS115 as a marker for detection of heterozygotes in families at risk for hemophilia A. Total genomic DNA was isolated from white blood cells, double digested by KpnI and XbaI and hybridized with EcoRI/SstI fragment of the genomic probe p482.6. The incidence of the polymorphic 5.1-kb fragment was estimated as 0.069 in a German population. A technical advantage of using the XbaI/KpnI RFLP is that both the intragenic XbaI-RFLP in intron 22 of factor VIII gene and the new intergenic RFLP can be evaluated at the same time.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell reports 3 (1984), S. 14-17 
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From seedlings of two violet flowering, inbred lines of Portulaca grandiflora hypocotyls were isolated and then halved by cross sections. On a modified Murashige-Skoog medium the pairs of segments frequently yielded “quartetts” of primary calli from the four cut surfaces. After some subcultivations of these groups, the betacyanin concentrations of cell cultures were measured and subjected to several statistical methods. In 5.0 per cent of all cell cultures belonging to line L and in 2.1 per cent of those derived from line H extremely high and low concentrations were caused by the in vitro conditions. Some other ones are obviously due to the character of seedlings used for experiment L 2. Furthermore it is statistically detectable that the cell culture coming from the basipetal cut of a hypocotyl segment is superior to the cell culture of acropetal origin with regard to betacyanin concentration. These differences indicate the polarization of physiological conditions in the hypocotyl segments.
    Type of Medium: Electronic Resource
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