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Naerland T, Nag HE, Dønnum MS, Høyland AL, Heussler HS. New approaches to the study of behavioural phenotypes. J Intellect Disabil Res 2022; 66:667-668. [PMID: 35981964 DOI: 10.1111/jir.12961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- T Naerland
- K.G. Jebsen Centre for Neurodevelopmental Disorders, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- NevSom, Department of Rare Disorders and Disabilities, Oslo University Hospital, Oslo, Norway
| | - H E Nag
- Frambu Resource Centre for Rare Disorders, Siggerud, Norway
| | - M S Dønnum
- Department of Adult Habilitation, Akershus University Hospital, Lørenskog, Norway
| | - A L Høyland
- Regional Centre for Child and Youth Mental Health and Child Welfare, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Pediatrics, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
| | - H S Heussler
- Child Development Program, Children's Health Queensland, South Brisbane, Queensland, Australia
- Centre for Children's Health Research, University of Queensland, Brisbane, Queensland, Australia
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Hawi Z, Cummins TDR, Tong J, Arcos-Burgos M, Zhao Q, Matthews N, Newman DP, Johnson B, Vance A, Heussler HS, Levy F, Easteal S, Wray NR, Kenny E, Morris D, Kent L, Gill M, Bellgrove MA. Rare DNA variants in the brain-derived neurotrophic factor gene increase risk for attention-deficit hyperactivity disorder: a next-generation sequencing study. Mol Psychiatry 2017; 22:580-584. [PMID: 27457811 DOI: 10.1038/mp.2016.117] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 04/14/2016] [Accepted: 05/06/2016] [Indexed: 12/26/2022]
Abstract
Attention-deficit hyperactivity disorder (ADHD) is a prevalent and highly heritable disorder of childhood with negative lifetime outcomes. Although candidate gene and genome-wide association studies have identified promising common variant signals, these explain only a fraction of the heritability of ADHD. The observation that rare structural variants confer substantial risk to psychiatric disorders suggests that rare variants might explain a portion of the missing heritability for ADHD. Here we believe we performed the first large-scale next-generation targeted sequencing study of ADHD in 152 child and adolescent cases and 188 controls across an a priori set of 117 genes. A multi-marker gene-level analysis of rare (<1% frequency) single-nucleotide variants (SNVs) revealed that the gene encoding brain-derived neurotrophic factor (BDNF) was associated with ADHD at Bonferroni corrected levels. Sanger sequencing confirmed the existence of all novel rare BDNF variants. Our results implicate BDNF as a genetic risk factor for ADHD, potentially by virtue of its critical role in neurodevelopment and synaptic plasticity.
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Affiliation(s)
- Z Hawi
- School of Psychological Sciences and Monash Institute for Cognitive and Clinical Neurosciences (MICCN), Monash University, Melbourne, VIC, Australia
| | - T D R Cummins
- School of Psychological Sciences and Monash Institute for Cognitive and Clinical Neurosciences (MICCN), Monash University, Melbourne, VIC, Australia
| | - J Tong
- School of Psychological Sciences and Monash Institute for Cognitive and Clinical Neurosciences (MICCN), Monash University, Melbourne, VIC, Australia
| | - M Arcos-Burgos
- John Curtin School of Medical Research, Australian National University, Canberra, ACT, Australia
| | - Q Zhao
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - N Matthews
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - D P Newman
- School of Psychological Sciences and Monash Institute for Cognitive and Clinical Neurosciences (MICCN), Monash University, Melbourne, VIC, Australia
| | - B Johnson
- School of Psychological Sciences and Monash Institute for Cognitive and Clinical Neurosciences (MICCN), Monash University, Melbourne, VIC, Australia
| | - A Vance
- Academic Child Psychiatry Unit, Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Melbourne, VIC, Australia
| | - H S Heussler
- Mater Research Institute, University of Queensland, Brisbane, QLD, Australia
| | - F Levy
- School of Psychiatry, University of New South Wales, Sydney, NSW, Australia.,Child and Family East, Prince of Wales Hospital, Randwick, NSW, Australia
| | - S Easteal
- John Curtin School of Medical Research, Australian National University, Canberra, ACT, Australia
| | - N R Wray
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - E Kenny
- Neuropsychiatric Genetics Research Group, Department of Psychiatry and Institute of Molecular Medicine, Trinity College Dublin, Dublin, Ireland
| | - D Morris
- Department of Biochemistry, National University of Ireland Galway, Galway, Ireland
| | - L Kent
- School of Medicine, University of St Andrews, St Andrews, Scotland, UK
| | - M Gill
- Neuropsychiatric Genetics Research Group, Department of Psychiatry and Institute of Molecular Medicine, Trinity College Dublin, Dublin, Ireland
| | - M A Bellgrove
- School of Psychological Sciences and Monash Institute for Cognitive and Clinical Neurosciences (MICCN), Monash University, Melbourne, VIC, Australia.,Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
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Markovich D, McWhinney A, Heussler HS, Bowling FG, Dawson PA, Ku MC, Muslim D. WITHDRAWN: NaS1 sulfate transporter is linked to hyposulfatemia and longevity. Biochem Biophys Res Commun 2010:S0006-291X(10)02156-X. [PMID: 21111708 DOI: 10.1016/j.bbrc.2010.11.090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 11/19/2010] [Indexed: 05/30/2023]
Abstract
This article has been withdrawn at the request of the editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- D Markovich
- School of Biomedical Sciences, University of Queensland, St. Lucia, Australia
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Abstract
BACKGROUND Current genotype-phenotype correlations in Prader-Willi syndrome (PWS) are struggling to give an explanation of the diversity in phenotype and there is a need to move towards a molecular understanding of PWS. A range of functions related to glycoproteins are involved in the pathophysiology of PWS and it may be that abnormal glycosylation is contributing to the biological phenotype. The objective of this study was to investigate the state of N- and O-linked glycosylation in children with Prader-Willi syndrome. METHODS Twenty-three children with PWS and 20 non-PWS controls were included in the study. Protein N-linked glycosylation was assessed by analysing serum transferrin through mass spectrometry and protein O-linked through isoelectric focusing (IEF) of serum apolipoprotein C-III (apoC-III), confirmed by mass spectrometry. RESULTS The results of this analysis indicated that the N-linked glycosylation pathway in PWS is normal. A subgroup of PWS individuals was found to have a hyposialylated pattern of apoC-III isoforms. This was independent of the underlying genetic mechanism and is the first report of an apoC-III IEF abnormality in PWS. CONCLUSIONS This is the first report of apoC-III hyposialylation in PWS. As this field is in its infancy, additional study is required before these findings may be used in clinical settings.
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Affiliation(s)
- T Munce
- Department of Biochemical Diseases, Mater Children's Hospital, South Brisbane, Queensland, Australia
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Sankupellay M, Wilson S, Heussler HS, Parsley C, Yuill M, Dakin C. Characteristics of sleep EEG power spectra in healthy infants in the first two years of life. Clin Neurophysiol 2010; 122:236-43. [PMID: 20650681 DOI: 10.1016/j.clinph.2010.06.030] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 06/02/2010] [Accepted: 06/30/2010] [Indexed: 11/29/2022]
Abstract
OBJECTIVE This study characterises and describes the maturational evolution of the healthy infant sleep electroencephalogram (EEG) longitudinally from 2 weeks to 24 months of age, by means of power spectral analysis. METHODS A prospective cohort of 34 healthy infants underwent overnight polysomnography (PSG) at 2 weeks, and at 3, 6, 12 and 24 months of age. Sleep epochs were scored as Active Sleep (AS) and Quiet Sleep (QS) at 2 weeks of age and as Rapid Eye Movement (REM) and Non-REM (NREM) stages from 3 months onwards. Representative epochs were used to generate the EEG power spectra, from the central C3 derivation. These were analysed visually and quantitatively in AS/REM and QS/NREM sleep in the following bandwidths: delta (0.5-4 Hz); theta (4-8 Hz); alpha (8-11 Hz); sigma (11-15 Hz) and 0.5-25 Hz. RESULTS Sleep EEG (central derivation) power spectra changed significantly in the different bandwidths as the infants matured. The emergence of a peak in the sigma bandwidth in NREM N2 sleep corresponded with the development of sleep spindles. Maturational changes were also seen in NREM N3 and in theta and alpha bandwidths in both AS/REM and QS/NREM. CONCLUSIONS Sleep EEG power spectra characteristics in healthy infants evolve in keeping with maturation and neurodevelopmental milestones. SIGNIFICANCE This study provides an atlas of healthy infant sleep EEG in the early years of life, providing a basis for association with other neurodevelopmental measures and a normative dataset on which disease may be discriminated.
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Affiliation(s)
- Mangalam Sankupellay
- School of Information Technology & Electrical Engineering, University of Queensland, Australia.
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Abstract
Holoprosencephaly (HPE) is a clinically variable and genetically heterogeneous central nervous system (CNS) malformation. Alobar HPE, which is its most severe form, is associated with a poor prognosis. At the milder end of the HPE spectrum microcephaly, hypotelorism, and single central maxillary incisor may be recognised. Currently, four genes have been identified for this condition. These include Sonic Hedgehog (SHH) on chromosome 7q36, which is thought to be responsible for a significant proportion of autosomal dominant HPE. We report an index case with alobar holoprosencephaly caused by an SHH mutation and six members of his family over two generations with this mutation, with a broad range of clinical presentation, including attention deficit hyperactivity disorder (ADHD). The combination of microcephaly, hypotelorism, subtle midline facial anomalies, and ADHD within a sibship should alert the physician to the possible diagnosis of HPE.
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Affiliation(s)
- H S Heussler
- Academic Division of Child Health, University of Nottingham, Nottingham NG7 2UH, UK.
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