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Sukalo M.,University Hospital Magdeburg | Tilsen F.,University Hospital Magdeburg | Kayserili H.,Istanbul Medical Faculty | Kayserili H.,Koc University | And 16 more authors.
Human Mutation | Year: 2015

Adams-Oliver syndrome (AOS) is characterized by the association of aplasia cutis congenita with terminal transverse limb defects, often accompanied by additional cardiovascular or neurological features. Both autosomal-dominant and autosomal-recessive disease transmission have been observed, with recent gene discoveries indicating extensive genetic heterogeneity. Mutations of the DOCK6 gene were first described in autosomal-recessive cases of AOS and only five DOCK6-related families have been reported to date. Recently, a second type of autosomal-recessive AOS has been attributed to EOGT mutations in three consanguineous families. Here, we describe the identification of 13 DOCK6 mutations, the majority of which are novel, across 10 unrelated individuals from a large cohort comprising 47 sporadic cases and 31 AOS pedigrees suggestive of autosomal-recessive inheritance. DOCK6 mutations were strongly associated with structural brain abnormalities, ocular anomalies, and intellectual disability, thus suggesting that DOCK6-linked disease represents a variant of AOS with a particularly poor prognosis. © 2015 WILEY PERIODICALS, INC. Source

Koenig R.,Goethe University Frankfurt | Meinecke P.,Abteilung Medizinische Genetik | Kuechler A.,Universitatsklinikums Essen | Schafer D.,Goethe University Frankfurt | Muller D.,Institute For Medizinische Genetik
American Journal of Medical Genetics, Part A | Year: 2010

We describe three patients with a syndrome comprising arched, thick eyebrows, hypertelorism, narrow palpebral fissures, broad nasal bridge and tip, long philtrum, thin upper lip, stubby hands and feet, hirsutism, and severe psychomotor retardation. These patients expand the phenotype of the Wiedemann-Steiner syndrome and delineate it as an entity. © 2010 Wiley-Liss, Inc. Source

Joss S.,Yorkshire Regional Genetics Center | Joss S.,Ferguson Smith Center | Kini U.,Oxford Genetics | Fisher R.,Yorkshire Regional Genetics Center | And 4 more authors.
European Journal of Medical Genetics | Year: 2011

Ulnar Mammary syndrome (UMS) is an autosomal disorder caused by haploinsufficiency of the TBX3 gene. There is marked intrafamilial variation in expression of the syndrome. We present one three generation family in which the proband has absence of the right ulna and third, fourth and fifth rays in her right hand. Her mother and maternal grandmother have more subtle anomalies while all have a similar facial appearance with a broad nasal tip, a broad jaw, a prominent chin and a tongue frenulum. They have a single base pair insertion (c. 992dup) in TBX3. We compare faces from the handful of published UMS patients which include photographs, this family and four other cases with TBX3 mutations. All have similarities in appearance which we suggest could alert clinicians to the possibility of a TBX3 mutation if individuals present with more subtle features of UMS such as postaxial polydactyly, isolated 5th finger anomalies, delayed puberty in males, breast hypoplasia or short stature with or without growth hormone deficiency. © 2010 Elsevier Masson SAS. Source

Rainger J.,Medical Research Council Institute of Genetics and Molecular Medicine | Pehlivan D.,Baylor College of Medicine | Johansson S.,University of Bergen | Bengani H.,Medical Research Council Institute of Genetics and Molecular Medicine | And 31 more authors.
American Journal of Human Genetics | Year: 2014

We identified four different missense mutations in the single-exon gene MAB21L2 in eight individuals with bilateral eye malformations from five unrelated families via three independent exome sequencing projects. Three mutational events altered the same amino acid (Arg51), and two were identical de novo mutations (c.151C>T [p.Arg51Cys]) in unrelated children with bilateral anophthalmia, intellectual disability, and rhizomelic skeletal dysplasia. c.152G>A (p.Arg51His) segregated with autosomal-dominant bilateral colobomatous microphthalmia in a large multiplex family. The fourth heterozygous mutation (c.145G>A [p.Glu49Lys]) affected an amino acid within two residues of Arg51 in an adult male with bilateral colobomata. In a fifth family, a homozygous mutation (c.740G>A [p.Arg247Gln]) altering a different region of the protein was identified in two male siblings with bilateral retinal colobomata. In mouse embryos, Mab21l2 showed strong expression in the developing eye, pharyngeal arches, and limb bud. As predicted by structural homology, wild-type MAB21L2 bound single-stranded RNA, whereas this activity was lost in all altered forms of the protein. MAB21L2 had no detectable nucleotidyltransferase activity in vitro, and its function remains unknown. Induced expression of wild-type MAB21L2 in human embryonic kidney 293 cells increased phospho-ERK (pERK1/2) signaling. Compared to the wild-type and p.Arg247Gln proteins, the proteins with the Glu49 and Arg51 variants had increased stability. Abnormal persistence of pERK1/2 signaling in MAB21L2-expressing cells during development is a plausible pathogenic mechanism for the heterozygous mutations. The phenotype associated with the homozygous mutation might be a consequence of complete loss of MAB21L2 RNA binding, although the cellular function of this interaction remains unknown. © 2014 The American Society of Human Genetics. Source

Hakoyama T.,Japan National Institute of Agrobiological Science | Hakoyama T.,Aichi University of Education | Hakoyama T.,University of Tokyo | Niimi K.,Aichi University of Education | And 19 more authors.
Plant and Cell Physiology | Year: 2012

Legume plants establish a symbiotic association with bacteria called rhizobia, resulting in the formation of nitrogen-fixing root nodules. A Lotus japonicus symbiotic mutant, sen1, forms nodules that are infected by rhizobia but that do not fix nitrogen. Here, we report molecular identification of the causal gene, SEN1, by map-based cloning. The SEN1 gene encodes an integral membrane protein homologous to Glycine max nodulin-21, and also to CCC1, a vacuolar iron/manganese transporter of Saccharomyces cerevisiae, and VIT1, a vacuolar iron transporter of Arabidopsis thaliana. Expression of the SEN1 gene was detected exclusively in nodule-infected cells and increased during nodule development. Nif gene expression as well as the presence of nitrogenase proteins was detected in rhizobia from sen1 nodules, although the levels of expression were low compared with those from wild-type nodules. Microscopic observations revealed that symbiosome and/or bacteroid differentiation are impaired in the sen1 nodules even at a very early stage of nodule development. Phylogenetic analysis indicated that SEN1 belongs to a protein clade specific to legumes. These results indicate that SEN1 is essential for nitrogen fixation activity and symbiosome/bacteroid differentiation in legume nodules. © 2011 The Author. Source

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