@article {10748, title = {ACTN1 mutations lead to a benign form of platelet macrocytosis not always associated with thrombocytopenia.}, journal = {Br J Haematol}, volume = {183}, year = {2018}, month = {2018 Oct}, pages = {276-288}, abstract = {

The inherited thrombocytopenias (IT) are a heterogeneous group of diseases resulting from mutations in more than 30 different genes. Among them, ACTN1-related thrombocytopenia (ACTN1-RT; Online Mendelian Inheritance in Man: 615193) is one of the most recently identified forms. It has been described as a mild autosomal dominant macrothrombocytopenia caused by mutations in ACTN1, a gene encoding for one of the two non-muscle isoforms of α-actinin. We recently identified seven new unrelated families with ACTN1-RT caused by different mutations. Two of them are novel missense variants (p.Trp128Cys and p.Pro233Leu), whose pathogenic role has been confirmed by in~vitro studies. Together with the 10 families we have previously described, our cohort of ACTN1-RT now consists of 49 individuals carrying ACTN1 mutations. This is the largest case series ever collected and enabled a critical evaluation of the clinical aspects of the disease. We concluded that ACTN1-RT is the fourth most frequent form of IT worldwide and it is characterized by platelet macrocytosis in all affected subjects and mild thrombocytopenia in less than 80\% of cases. The risk of bleeding, either spontaneous or upon haemostatic challenge, is negligible and there are no other associated defects, either congenital or acquired. Therefore, ACTN1-RT is a benign form of IT, whose diagnosis provides affected individuals and their families with a good prognosis.

}, issn = {1365-2141}, doi = {10.1111/bjh.15531}, author = {Faleschini, Michela and Melazzini, Federica and Marconi, Caterina and Giangregorio, Tania and Pippucci, Tommaso and Cigalini, Elena and Pecci, Alessandro and Bottega, Roberta and Ramenghi, Ugo and Siitonen, Timo and Seri, Marco and Pastore, Annalisa and Savoia, Anna and Noris, Patrizia} } @article {10574, title = {Gray platelet syndrome: Novel mutations of the NBEAL2 gene.}, journal = {Am J Hematol}, volume = {92}, year = {2017}, month = {2017 02}, pages = {E20-E22}, keywords = {Adult, Alleles, Blood Proteins, Child, Female, Gene Expression, Gene Frequency, Genotype, Gray Platelet Syndrome, Humans, Male, Mutation, Phenotype, Platelet Aggregation, Platelet Count, Platelet Membrane Glycoproteins}, issn = {1096-8652}, doi = {10.1002/ajh.24610}, author = {Bottega, Roberta and Nicchia, Elena and Alfano, Caterina and Glembotsky, Ana C and Pastore, Annalisa and Bertaggia-Calderara, Debora and Bisig, Bettina and Duchosal, Michel A and Arbes{\'u}, Guillermo and Alberio, Lorenzo and Heller, Paula G and Savoia, Anna} } @article {3550, title = {Mutations of cytochrome c identified in patients with thrombocytopenia THC4 affect both apoptosis and cellular bioenergetics.}, journal = {Biochim Biophys Acta}, volume = {1842}, year = {2014}, month = {2014 Feb}, pages = {269-74}, abstract = {

Inherited thrombocytopenias are heterogeneous diseases caused by at least 20 genes playing different role in the processes of megakaryopoiesis and platelet production. Some forms, such as thrombocytopenia 4 (THC4), are very rare and not well characterized. THC4 is an autosomal dominant mild thrombocytopenia described in only one large family from New Zealand and due to a mutation (G41S) of the somatic isoform of the cytochrome c (CYCS) gene. We report a novel CYCS mutation (Y48H) in patients from an Italian family. Similar to individuals carrying G41S, they have platelets of normal size and morphology, which are only partially reduced in number, but no prolonged bleeding episodes. In order to determine the pathogenetic consequences of Y48H, we studied the effects of the two CYCS mutations in yeast and mouse cellular models. In both cases, we found reduction of respiratory level and increased apoptotic rate, supporting the pathogenetic role of CYCS in thrombocytopenia.

}, keywords = {Amino Acid Sequence, Animals, Apoptosis, Base Sequence, Cells, Cultured, Child, Preschool, Cytochromes c, DNA Mutational Analysis, Embryo, Mammalian, Energy Metabolism, Family Health, Female, Fibroblasts, Humans, Lung, Male, Mice, Molecular Sequence Data, Mutation, Missense, Oxygen Consumption, Pedigree, Saccharomyces cerevisiae, Sequence Homology, Amino Acid, Thrombocytopenia}, issn = {0006-3002}, doi = {10.1016/j.bbadis.2013.12.002}, author = {De Rocco, Daniela and Cerqua, Cristina and Goffrini, Paola and Russo, Giovanna and Pastore, Annalisa and Meloni, Francesca and Nicchia, Elena and Moraes, Carlos T and Pecci, Alessandro and Salviati, Leonardo and Savoia, Anna} } @article {3552, title = {Spectrum of the mutations in Bernard-Soulier syndrome.}, journal = {Hum Mutat}, volume = {35}, year = {2014}, month = {2014 Sep}, pages = {1033-45}, abstract = {

Bernard-Soulier syndrome (BSS) is a rare autosomal recessive bleeding disorder characterized by defects of the GPIb-IX-V complex, a platelet receptor for von Willebrand factor (VWF). Most of the mutations identified in the genes encoding for the GP1BA (GPIbα), GP1BB (GPIbβ), and GP9 (GPIX) subunits prevent expression of the complex at the platelet membrane or more rarely its interaction with VWF. As a consequence, platelets are unable to adhere to the vascular subendothelium and agglutinate in response to ristocetin. In order to collect information on BSS patients, we established an International Consortium for the study of BSS, allowing us to enrol and genotype 132 families (56 previously unreported). With 79 additional families for which molecular data were gleaned from the literature, the 211 families characterized so far have mutations in the GP1BA (28\%), GP1BB (28\%), or GP9 (44\%) genes. There is a wide spectrum of mutations with 112 different variants, including 22 novel alterations. Consistent with the rarity of the disease, 85\% of the probands carry homozygous mutations with evidence of founder effects in some geographical areas. This overview provides the first global picture of the molecular basis of BSS and will lead to improve patient diagnosis and management.

}, keywords = {Alleles, Bernard-Soulier Syndrome, Databases, Nucleic Acid, Founder Effect, Genetic Variation, Humans, Mutation, Platelet Glycoprotein GPIb-IX Complex, Polymorphism, Single Nucleotide, von Willebrand Diseases, Web Browser}, issn = {1098-1004}, doi = {10.1002/humu.22607}, author = {Savoia, Anna and Kunishima, Shinji and De Rocco, Daniela and Zieger, Barbara and Rand, Margaret L and Pujol-Moix, N{\'u}ria and Caliskan, Umran and Tokgoz, Huseyin and Pecci, Alessandro and Noris, Patrizia and Srivastava, Alok and Ward, Christopher and Morel-Kopp, Marie-Christine and Alessi, Marie-Christine and Bellucci, Sylvia and Beurrier, Philippe and de Maistre, Emmanuel and Favier, R{\'e}mi and H{\'e}zard, Nathalie and Hurtaud-Roux, Marie-Fran{\c c}oise and Latger-Cannard, V{\'e}ronique and Lavenu-Bombled, C{\'e}cile and Proulle, Val{\'e}rie and Meunier, Sandrine and N{\'e}grier, Claude and Nurden, Alan and Randrianaivo, Hanitra and Fabris, Fabrizio and Platokouki, Helen and Rosenberg, Nurit and HadjKacem, Basma and Heller, Paula G and Karimi, Mehran and Balduini, Carlo L and Pastore, Annalisa and Lanza, Francois} } @article {1993, title = {MYH9-related disease: five novel mutations expanding the spectrum of causative mutations and confirming genotype/phenotype correlations.}, journal = {Eur J Med Genet}, volume = {56}, year = {2013}, month = {2013 Jan}, pages = {7-12}, abstract = {

MYH9-related disease (MYH9-RD) is a rare autosomal dominant syndromic disorder caused by mutations in MYH9, the gene encoding for the heavy chain of non-muscle myosin IIA (myosin-9). MYH9-RD is characterized by congenital macrothrombocytopenia and typical inclusion bodies in neutrophils associated with a variable risk of developing sensorineural deafness, presenile cataract, and/or progressive nephropathy. The spectrum of mutations responsible for MYH9-RD is limited. We report five families, each with a novel MYH9 mutation. Two mutations, p.Val34Gly and p.Arg702Ser, affect the motor domain of myosin-9, whereas the other three, p.Met847_Glu853dup, p.Lys1048_Glu1054del, and p.Asp1447Tyr, hit the coiled-coil tail domain of the protein. The motor domain mutations were associated with more severe clinical phenotypes than those in the tail domain.

}, keywords = {Adolescent, Adult, Amino Acid Sequence, Amino Acid Substitution, Base Sequence, Child, Child, Preschool, Exons, Female, Genes, Dominant, Genetic Association Studies, Humans, Male, Middle Aged, Models, Molecular, Molecular Motor Proteins, Molecular Sequence Data, Mutation, Myosin Heavy Chains, Pedigree, Protein Conformation, Sequence Alignment, Syndrome, Thrombocytopenia, Young Adult}, issn = {1878-0849}, doi = {10.1016/j.ejmg.2012.10.009}, author = {De Rocco, Daniela and Zieger, Barbara and Platokouki, Helen and Heller, Paula G and Pastore, Annalisa and Bottega, Roberta and Noris, Patrizia and Barozzi, Serena and Glembotsky, Ana C and Pergantou, Helen and Balduini, Carlo L and Savoia, Anna and Pecci, Alessandro} } @article {1697, title = {Clinical and genetic aspects of Bernard-Soulier syndrome: searching for genotype/phenotype correlations.}, journal = {Haematologica}, volume = {96}, year = {2011}, month = {2011 Mar}, pages = {417-23}, abstract = {

BACKGROUND: Bernard-Soulier syndrome is a severe bleeding disease due to a defect of GPIb/IX/V, a platelet complex that binds the von Willebrand factor. Due to the rarity of the disease, there are reports only on a few cases compromising any attempt to establish correlations between genotype and phenotype. In order to identify any associations, we describe the largest case series ever reported, which was evaluated systematically at the same center.

DESIGN AND METHODS: Thirteen patients with the disease and seven obligate carriers were enrolled. We collected clinical aspects and determined platelet features, including number and size, expression of membrane glycoproteins, and ristocetin induced platelet aggregation. Mutations were identified by direct sequencing of the GP1BA, GP1BB, and GP9 genes and their effect was shown by molecular modeling analyses.

RESULTS: Patients all had a moderate thrombocytopenia with giant platelets and a bleeding tendency whose severity varied among individuals. Consistent with expression levels of GPIbα always lower than 10\% of control values, platelet aggregation was absent or severely reduced. Homozygous mutations were identified in the GP1BA, GP1BB and GP9 genes; six were novel alterations expected to destabilize the conformation of the respective protein. Except for obligate carriers of a GP9 mutation with a reduced GPIb/IX/V expression and defective aggregation, all the other carriers had no obvious anomalies.

CONCLUSIONS: Regardless of mutations identified, the patients{\textquoteright} bleeding diathesis did not correlate with thrombocytopenia, which was always moderate, and platelet GPIbα expression, which was always severely impaired. Obligate carriers had features similar to controls though their GPIb/IX/V expression showed discrepancies. Aware of the limitations of our cohort, we cannot define any correlations. However, further investigations should be encouraged to better understand the causes of this rare and underestimated disease.

}, keywords = {Adolescent, Adult, Amino Acid Sequence, Bernard-Soulier Syndrome, Blood Platelets, Cell Shape, Child, Child, Preschool, Female, Genetic Association Studies, Genetic Markers, Hemorrhage, Homozygote, Humans, Italy, Male, Membrane Glycoproteins, Middle Aged, Molecular Sequence Data, Platelet Aggregation, Platelet Count, Platelet Glycoprotein GPIb-IX Complex, Point Mutation, Polymerase Chain Reaction, Ristocetin, Thrombocytopenia, von Willebrand Factor, Young Adult}, issn = {1592-8721}, doi = {10.3324/haematol.2010.032631}, author = {Savoia, Anna and Pastore, Annalisa and De Rocco, Daniela and Civaschi, Elisa and Di Stazio, Mariateresa and Bottega, Roberta and Melazzini, Federica and Bozzi, Valeria and Pecci, Alessandro and Magrin, Silvana and Balduini, Carlo L and Noris, Patrizia} }