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Ruffmann C, Calboli FCF, Bravi I, Gveric D, Curry LK, de Smith A, Pavlou S, Buxton JL, Blakemore AIF, Takousis P, Molloy S, Piccini P, Dexter DT, Roncaroli F, Gentleman SM, Middleton LT. Cortical Lewy bodies and Aβ burden are associated with prevalence and timing of dementia in Lewy body diseases. Neuropathol Appl Neurobiol 2015; 42:436-50. [DOI: 10.1111/nan.12294] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 09/24/2015] [Accepted: 11/03/2015] [Indexed: 01/16/2023]
Affiliation(s)
- C. Ruffmann
- Neuroepidemiology and Ageing Research Unit; School of Public Health; Imperial College; London UK
- Centro Parkinson; Istituti Clinici di Perfezionamento di Milano; Milano Italy
| | - F. C. F. Calboli
- Neuroepidemiology and Ageing Research Unit; School of Public Health; Imperial College; London UK
| | - I. Bravi
- Division of Brain Sciences; Department of Medicine; Imperial College; London UK
| | - D. Gveric
- Division of Brain Sciences; Department of Medicine; Imperial College; London UK
| | - L. K. Curry
- Neuroepidemiology and Ageing Research Unit; School of Public Health; Imperial College; London UK
| | - A. de Smith
- Genomics of Common Disease; School of Public Health; Imperial College; London UK
- Department of Epidemiology and Biostatistics; University of California, San Francisco; San Francisco CA USA
| | - S. Pavlou
- Genomics of Common Disease; School of Public Health; Imperial College; London UK
- Department of Molecular Virology; Cyprus Institute of Neurology and Genetics; Nicosia Cyprus
| | - J. L. Buxton
- Section of Investigative Medicine; Department of Medicine; Imperial College; London UK
| | - A. I. F. Blakemore
- Section of Investigative Medicine; Department of Medicine; Imperial College; London UK
| | - P. Takousis
- Neuroepidemiology and Ageing Research Unit; School of Public Health; Imperial College; London UK
| | - S. Molloy
- Division of Brain Sciences; Department of Medicine; Imperial College; London UK
| | - P. Piccini
- Division of Brain Sciences; Department of Medicine; Imperial College; London UK
| | - D. T. Dexter
- Division of Brain Sciences; Department of Medicine; Imperial College; London UK
| | - F. Roncaroli
- Institute of Brain Behaviour and Mental Health; University of Manchester; Manchester UK
| | - S. M. Gentleman
- Division of Brain Sciences; Department of Medicine; Imperial College; London UK
| | - L. T. Middleton
- Neuroepidemiology and Ageing Research Unit; School of Public Health; Imperial College; London UK
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Fraser-Smith AC, Buxton JL. Superconducting magnetometer measurements of geomagnetic activity in the 0.1- to 14-Hz frequency range. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja080i022p03141] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Walters RG, Jacquemont S, Valsesia A, de Smith AJ, Martinet D, Andersson J, Falchi M, Chen F, Andrieux J, Lobbens S, Delobel B, Stutzmann F, El-Sayed Moustafa JS, Chèvre JC, Lecoeur C, Vatin V, Bouquillon S, Buxton JL, Boute O, Holder-Espinasse M, Cuisset JM, Lemaitre MP, Ambresin AE, Brioschi A, Gaillard M, Giusti V, Fellmann F, Ferrarini A, Hadjikhani N, Campion D, Guilmatre A, Goldenberg A, Calmels N, Mandel JL, Le Caignec C, David A, Isidor B, Cordier MP, Dupuis-Girod S, Labalme A, Sanlaville D, Béri-Dexheimer M, Jonveaux P, Leheup B, Ounap K, Bochukova EG, Henning E, Keogh J, Ellis RJ, Macdermot KD, van Haelst MM, Vincent-Delorme C, Plessis G, Touraine R, Philippe A, Malan V, Mathieu-Dramard M, Chiesa J, Blaumeiser B, Kooy RF, Caiazzo R, Pigeyre M, Balkau B, Sladek R, Bergmann S, Mooser V, Waterworth D, Reymond A, Vollenweider P, Waeber G, Kurg A, Palta P, Esko T, Metspalu A, Nelis M, Elliott P, Hartikainen AL, McCarthy MI, Peltonen L, Carlsson L, Jacobson P, Sjöström L, Huang N, Hurles ME, O'Rahilly S, Farooqi IS, Männik K, Jarvelin MR, Pattou F, Meyre D, Walley AJ, Coin LJM, Blakemore AIF, Froguel P, Beckmann JS. A new highly penetrant form of obesity due to deletions on chromosome 16p11.2. Nature 2010; 463:671-5. [PMID: 20130649 PMCID: PMC2880448 DOI: 10.1038/nature08727] [Citation(s) in RCA: 345] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2009] [Accepted: 12/01/2009] [Indexed: 01/04/2023]
Affiliation(s)
- R G Walters
- Section of Genomic Medicine, Imperial College London, London W12 0NN, UK
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Gilbert HL, Buxton JL, Chan CT, McKay T, Cottrell S, Ramsden S, Winter RM, Pembrey ME, Malcolm S. Counselling dilemmas associated with the molecular characterisation of two Angelman syndrome families. J Med Genet 1997; 34:651-5. [PMID: 9279757 PMCID: PMC1051027 DOI: 10.1136/jmg.34.8.651] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We report the molecular characterisation of two families with Angelman syndrome referred for prenatal diagnosis, in which atypical molecular findings resulted in counselling dilemmas. The first is a familial case of Angelman syndrome in which the two affected children have mutations which affect the imprinting mechanism, as shown by the presence of paternal DNA methylation patterns at D15S63 and SNRPN and biparental inheritance of 15q11-q13 markers. DNA prepared from a 21 week fetal blood sample detected a fetus with normal maternal and paternal DNA methylation patterns at D15S63, but inheritance of the same maternal chromosome 15q11-q13 as the two affected sibs. This is probably a result of germline mosaicism in the mother. The second is a case of Angelman syndrome with an atypical deletion of 15q11-q13, which involves both unusual proximal and distal breakpoints. The deletion was characterised in order to assess the risk of Angelman syndrome in a second pregnancy in the mother of this child.
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Affiliation(s)
- H L Gilbert
- Division of Biochemistry and Genetics, Institute of Child Health, London, UK
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Saitoh S, Buiting K, Rogan PK, Buxton JL, Driscoll DJ, Arnemann J, König R, Malcolm S, Horsthemke B, Nicholls RD. Minimal definition of the imprinting center and fixation of chromosome 15q11-q13 epigenotype by imprinting mutations. Proc Natl Acad Sci U S A 1996; 93:7811-5. [PMID: 8755558 PMCID: PMC38830 DOI: 10.1073/pnas.93.15.7811] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Patients with disorders involving imprinted genes such as Angelman syndrome (AS) and Prader-Willi syndrome (PWS) can have a mutation in the imprinting mechanism. Previously, we identified an imprinting center (IC) within chromosome 15q11-ql3 and proposed that IC mutations block resetting of the imprint, fixing on that chromosome the parental imprint (epigenotype) on which the mutation arose. We now describe four new microdeletions of the IC, the smallest (6 kb) of which currently defines the minimal region sufficient to confer an AS imprinting mutation. The AS deletions all overlap this minimal region, centromeric to the PWS microdeletions, which include the first exon of the SNRPN gene. None of five genes or transcripts in the 1.0 Mb vicinity of the IC (ZNF127, SNRPN, PAR-5, IPW, and PAR-1), each normally expressed only from the paternal allele, was expressed in cells from PWS imprinting mutation patients. In contrast, AS imprinting mutation patients show biparental expression of SNRPN and IPW but must lack expression of the putative AS gene 250-1000 kb distal of the IC. These data strongly support a model in which the paternal chromosome of these PWS patients carries an ancestral maternal epigenotype, and the maternal chromosome of these AS patients carries an ancestral paternal epigenotype. The IC therefore functions to reset the maternal and paternal imprints throughout a 2-Mb imprinted domain within human chromosome 15q11-q13 during gametogenesis.
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Affiliation(s)
- S Saitoh
- Department of Genetics, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
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Buxton JL, Chan CT, Gilbert H, Clayton-Smith J, Burn J, Pembrey M, Malcolm S. Angelman syndrome associated with a maternal 15q11-13 deletion of less than 200 kb. Hum Mol Genet 1994; 3:1409-13. [PMID: 7987324 DOI: 10.1093/hmg/3.8.1409] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Angelman syndrome (AS) is a neurogenetic disorder arising from a lack of genetic contribution from the maternal chromosome 15q11-13. To date, the AS critical region has been defined by an inherited deletion of approximately 1.5Mb, spanning the 3-21 (D15S10), LS6-1 (D15S113) and GABRB3 loci. We have identified an individual with the typical features of AS who has a deletion of the maternal chromosome which encompasses LS6-1, but does not extend to either flanking marker. This deletion, initially detected by (CA)n repeat analysis, was further characterised by fluorescence in situ hybridisation (FISH) using cosmids derived from a 260 kb LS6-1 yeast artificial chromosome (YAC). Neither end cosmid from this YAC clone falls within the deletion, suggesting that the minimal AS region is less than 200 kb. We also studied three loci within 15q11-13 which detect parent-of-origin specific DNA methylation imprints, and found that both normal maternal and paternal patterns were present in this patient.
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Affiliation(s)
- J L Buxton
- Unit of Molecular Genetics, Institute of Child Health, London, UK
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Dimagno EP, Regan PT, Clain JE, James EM, Buxton JL. Human endoscopic ultrasonography. Gastroenterology 1982; 83:824-9. [PMID: 7106513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Conventional transcutaneous ultrasound examinations are often compromised by intervening pulmonary or bowel gas and have limited resolution. Ultrasonic probes of frequencies greater than 5 MHz, which enhance resolution, cannot be used successfully on the skin surface, because they do not penetrate deeply enough to view intraabdominal organs in most adults. To overcome these problems, we tested an ultrasonic endoscope which had a 10-MHz, 64-element linear assay, generated real-time images at resolutions of less than 1 mm, and was an integral part of a 35-mm-long and 13-mm-wide endoscopic rigid tip. Thirty-two studies were performed in 15 healthy subjects, 4 patients with pancreatic cancer and 6 patients with chronic pancreatitis, and 1 patient each with a gastric ulcer and a suspected pancreatic abscess. We demonstrated that this procedure is safe, provides high resolution real-time ultrasound visualization of the heart, aorta, spleen, pancreas, liver, gallbladder, kidneys, and gastrointestinal mucosa and can detect moderate-sized pancreatic tumors and hepatic metastases less than 1 cm in diameter. Because endoscopic visualization of gastrointestinal mucosa and ultrasound examination of extraluminal organs can be obtained during a single procedure, rapid differentiation among mucosal and intramural disease of the hollow gut and disease of extraluminal organs should be possible with this diagnostic technique.
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Enzmann DR, Britt RH, Lyons BE, Buxton JL, Wilson DA. Natural history of experimental intracerebral hemorrhage: sonography, computed tomography and neuropathology. AJNR Am J Neuroradiol 1981; 2:517-26. [PMID: 6797277 PMCID: PMC8335246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The evolution of intracerebral hemorrhage was investigated in a canine model by high resolution sonography, computed tomography (CT), and neuropathologic examination. In 12 dogs, a parietal lobe hematoma was introduced by craniotomy. The sonographic appearance of acute hemorrhage was characteristic and consisted of a sharply circumscribed, homogeneous, highly echogenic lesion, the size and shape of which correlated closely to the area of increased density seen on the CT scan. This changed within 3-4 days to an echogenic rim surrounding a hypoechoic center. Histologically, this change corresponded to a loss of integrity of individual red blood cells. This occurred earliest in the hemorrhage center causing a hypoechoic center, while intact red blood cells at the periphery accounted for the echogenic rim. Shortly after the red blood cells lost their biconcave shape they began to lose their hemoglobin causing the hemorrhage to become isodense with surrounding brain on the CT scan. Faint contrast enhancement by CT was noted at this early stage and was related primarily to a mononuclear perivascular infiltrate at the edge of the hemorrhage. A collagen capsule formed around the hemorrhage over a 2 week period. This capsule slowly replaced intact red cells as the cause of the now shrinking echogenic rim. This capsule was also responsible for the increasing ring contrast enhancement around the resolving hemorrhage. The sequence of image changes seen on both CT and sonography in this experimental model closely resembled the findings seen in intracerebral hemorrhage in patients.
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