ABSTRACT
SUMMARY: Combined factor V (FV) and factor VIII (FVIII) deficiency (F5F8D) is a rare autosomal recessive disorder caused by mutations in LMAN1 or MCFD2 genes which encode proteins that form a complex involved in the transport of FV and FVIII from the endoplasmic reticulum to Golgi apparatus. We report two novel mutations in MCFD2 gene and one recurrent mutation in LMAN1 gene that caused combined FV and FVIII deficiency in two unrelated Tunisian Muslim families. For the first family two patients were homozygous for a new missense mutation Asp81His in exon 3 of MCFD2 and heterozygous for a second new missense mutation Val100Asp in the same exon. Replacement respectively of the hydrophilic Asp residue with hydrophobic positively charged His and of the hydrophobic neutral Val residue with the Asp residue most likely disrupts the MCFD2-LMAN1 interaction, thus leading to the disease phenotype. For the second family a reported Arg202X mutation in exon 5 in the LMAN1 gene was identified in the homozygous state.
Subject(s)
Factor V Deficiency/genetics , Hemophilia A/genetics , Mannose-Binding Lectins/genetics , Membrane Proteins/genetics , Mutation, Missense , Vesicular Transport Proteins/genetics , DNA Mutational Analysis , Exons/genetics , Family , Female , Humans , Male , Sequence Analysis, DNA , TunisiaSubject(s)
Factor XIII Deficiency/genetics , Founder Effect , Postpartum Hemorrhage/prevention & control , Adult , Female , Genotype , Humans , Male , Phenotype , Pregnancy , TunisiaABSTRACT
Le kyste de la vallecule est une malformation laryngee rare pouvant parfois mettre en jeu le pronostic vital. Diagnostique et traite a temps; le risque de complications et de morbidite peut etre ecarte. Les auteurs rapportent 2 cas de kystes de la vallecule. La tomodensitometrie a confirme la presence d'une formation kystique prenant origine au niveau de la vallecule. Une laryngoscopie directe a ete faite pour les 2 patients sous anesthesie generale. Le premier malade a eu une resection endoscopique complete du kyste et le 2eme une large marsupialisation au Laser. L'examen anatomopathologique a confirme la benignite de la formation kystique dans les 2 cas
Subject(s)
Cysts , Endoscopy , Laryngoscopy , LarynxABSTRACT
The role of ethylene in shoot regeneration was investigated using transgenic Cucumis melo plants expressing an antisense 1-aminocyclopropane-1-carboxylate (ACC) oxidase gene. ACC oxidase catalyses the last step of ethylene biosynthesis. Leaf and cotyledon explants from the transgenic plants exhibited low ACC oxidase activity and ethylene production, whereas the regeneration capacity of the tissues was greatly enhanced (3.5- and 2.8-fold, respectively) compared to untransformed control tissues. Addition of ethylene released by 50 or 100 µM 2-chloroethylphosphonic acid dramatically reduced the shoot regeneration rate of the transgenic tissues. The results clearly demonstrate that ethylene plays an important role in C. melo morphogenesis in vitro.