1
|
Farashi S, Ohadi M, Hosseinkhani S, Darvish H, Mirabzadeh A. Decreased gene expression activity as a result of a mutation in the calreticulin gene promoter in a family case of schizoaffective disorder. Cogn Neurodyn 2016; 10:269-74. [PMID: 27275382 DOI: 10.1007/s11571-015-9366-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 10/28/2015] [Accepted: 11/05/2015] [Indexed: 12/22/2022] Open
Abstract
Accumulating evidence of population association studies support the hypothesis that the high heritability of major psychiatric disorders is a combination of relatively common alleles of modest effect, and rare alleles some with relatively larger effects. We have previously reported low frequency mutations in the proximal promoter of the human calreticulin (CALR) gene that co-occur with the spectrum of major psychiatric disorders. One of those mutations at -205C>T (rs556992558) was detected in an isolate case of schizoaffective disorder. In the current study, the functional implication of mutation -205T is studied in the human neuronal cell lines LAN-5, BE(2)-C and HEK-293. In contrast with other mutations in the promoter region which increase gene expression activity, the -205T mutation significantly decreased gene expression in those cell lines in comparison with the wild-type -205C nucleotide (p < 0.000001, p < 0.0005, and p < 0.017, respectively). Treatment of the cell lines with the mood-stabilizing drug, valproic acid (VPA) resulted in differential gene expression activity in the mutant -205T versus the wild-type -205C construct. VPA increased gene expression activity in both constructs, while a significantly higher expression activity was observed in the mutant construct (p < 0.01), indicative of the creation of a positive effector binding site for VPA as a result of the -205T mutation. We conclude that deviation from normalcy in the level of CALR in either direction is associated with major psychiatric disorders.
Collapse
Affiliation(s)
- S Farashi
- Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands ; Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - M Ohadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran ; Iranian Research Center on Aging, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - S Hosseinkhani
- Department of Biophysics & Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - H Darvish
- Department of Medical Genetics, Faculty of Medicine, Shahid Beheshti University of Medical Sciences and Health Services, Tehran, Iran
| | - A Mirabzadeh
- Department of Psychiatry, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| |
Collapse
|
2
|
Movafagh A, Sayad A, Hashemi M, Darvish H, Zare-Abdollahi D, Emamalizadeh B, Shahvaisizadeh F, Mansouri N, Mortazavi-Tabatabaei SA. Rare chromosome structural aberration characterizing oncology malignancy. Gulf J Oncolog 2015; 1:71-78. [PMID: 26003108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2015] [Indexed: 06/04/2023]
Abstract
UNLABELLED Ring chromosome aberration are rare abnormality potentially involving any chromosome in patients diagnosing in Oncology. The present review and case study has focused on the ring chromosome associated with oncology malignancies. MATERIAL AND METHODS An electronic peer review article search was performed systematically to obtain relevant literature with the CINAHL, Google scholar, and Pub Med databases. The keywords included marker, abnormalities, structural, Ring chromosome. The inclusion criteria for the review were that the documents were original quantitative research and published in English. This was also initiated using Medline, Mitelman database (http://cgap.nci.nih.gov/Chromosomes/Mitelman), Danish cytogenetic register and other pertinent web references on ring chromosomes in Oncology malignancies. Articles that were not directly relevant to the present objective were excluded. Also the un-stimulated bone marrow specimen of present case manipulated with Methotrexate cells culture synchronization and finally was treated by GTGbanding technique. RESULTS Ring chromosome was observed in 10% of the total cells. Cytogenetic analysis demonstrated apparently ring (15) 46, XY, r(15) karyotype. The clinical findings revealed history of nausea, loss of appetite, diarrhea, night sweats, and a weight loss, anemia and diagnosed as accelerated CML. CONCLUSION Our finding adds to the spectrum of both morphology and genetic rearrangements in oncology malignancies. Additional future analyses in similar subject will be necessary to draw firm conclusions.
Collapse
Affiliation(s)
- A Movafagh
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A Sayad
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - M Hashemi
- Department of Molecular Genetics, Islamic, Azad University, Tehran Medical Sciences Branch, Tehran, Iran
| | - H Darvish
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - D Zare-Abdollahi
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - B Emamalizadeh
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - F Shahvaisizadeh
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - N Mansouri
- Department of Medical Genetics, Pediatric Neurology Research Center, Mofid Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - S A Mortazavi-Tabatabaei
- Proteomics Research Center, School of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| |
Collapse
|
3
|
Jamshidi J, Movafagh A, Emamalizadeh B, Zare Bidoki A, Manafi A, Ghasemi Firouzabadi S, Shahidi GA, Kazeminasab S, Petramfar P, Fazeli A, Motallebi M, Mortazavi-Tabatabaei SA, Kowsari A, Jafarian Z, Darvish H. HLA-DRAis associated with Parkinson's disease in Iranian population. Int J Immunogenet 2014; 41:508-11. [DOI: 10.1111/iji.12151] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 08/10/2014] [Accepted: 09/07/2014] [Indexed: 01/12/2023]
Affiliation(s)
- J. Jamshidi
- Department of Biochemistry; Fasa University of Medical Sciences; Fasa Iran
| | - A. Movafagh
- Department of Medical Genetics; Shahid Beheshti University of Medical Sciences; Tehran Iran
- Department of Medical Genetics; Pediatric Neurology Research Center; School of Medicine; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - B. Emamalizadeh
- Department of Medical Genetics; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - A. Zare Bidoki
- Molecular Immunology Research Center; Children's Medical Center Hospital; Tehran University of Medical Sciences; Tehran Iran
- Department of Immunology; School of Medicine; Tehran University of Medical Sciences; Tehran Iran
| | - A. Manafi
- Student Research Committee; Fasa University of Medical Sciences; Fasa Iran
| | - S. Ghasemi Firouzabadi
- Genetics Research Center; University of Social Welfare and Rehabilitation Sciences; Tehran Iran
| | - G.-A. Shahidi
- Movement Disorders Clinic; Hazrat Rassol Hospital; Iran University of Medical Sciences; Tehran Iran
| | - S. Kazeminasab
- Genetics Research Center; University of Social Welfare and Rehabilitation Sciences; Tehran Iran
| | - P. Petramfar
- Department of Neurology; Shiraz University of Medical Sciences; Shiraz Iran
| | - A. Fazeli
- Department of Medical Genetics; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - M. Motallebi
- Department of Medical Genetics; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | | | - A. Kowsari
- Stem cell Research Center; Golestan University of Medical Science; Gorgan Iran
| | - Z. Jafarian
- Genetics Research Center; University of Social Welfare and Rehabilitation Sciences; Tehran Iran
| | - H. Darvish
- Department of Medical Genetics; Shahid Beheshti University of Medical Sciences; Tehran Iran
| |
Collapse
|
4
|
Mansouri N, Movafagh A, Sayad A, Ghafouri-Fard S, Darvish H, Zare-Abdollahi D, Emamalizadeh B, Shahvaisizadeh F, Ghaedi H, Bastami M, Kayyal M, Hashemi M, Heidari MH, Nejatizadeh A, Zamani M. Hepatitis B virus infection in patients with blood disorders: a concise review in pediatric study. Iran J Ped Hematol Oncol 2014; 4:178-87. [PMID: 25598959 PMCID: PMC4293518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 10/28/2014] [Indexed: 10/29/2022]
Abstract
Childhood Hepatitis B virus (HBV) infection causes both medical and public health challenges. Infants who acquire HBV parentally have up to 90% risk of developing chronic HBV infection. It is now estimated that approximately 10% of worldwide cancers are attributable to viral infection, with the vast majority (>85 %) occurring in the developing world. In this distribution, elevated rate and prevalence of HBV marker have been found in patients with malignancies as compared to the general population. By reviewing the web-based search for all Persian and English types of scientific peer review published articles initiated using Iran Medex, MEDLINE/PubMed, CINAHL and other pertinent references on websites about HBV and HCV blood disorders. The high prevalence of HBV and HCV infective markers was detected in patients with different malignancies. Moreover, identification of high prevalence of HBV infective markers in leukemia patients proposed strong association between hepatitis viral infections and leukemia.
Collapse
Affiliation(s)
- N Mansouri
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - A Movafagh
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Corresponding Author: Movafagh A PhD, Department of Medical Genetics, Pediatric Neurology Research Center, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A Sayad
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - S Ghafouri-Fard
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - H Darvish
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - D Zare-Abdollahi
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - B Emamalizadeh
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - F Shahvaisizadeh
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - H Ghaedi
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - M Bastami
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - M Kayyal
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - M Hashemi
- Department of Genetics, Islamic Azad University, Tehran, Iran.
| | - MH Heidari
- Department of Medical Anatomy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - A Nejatizadeh
- Department of Medical Genetics, Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
| | - M Zamani
- Department of Neurogenetics, Iranian Center of Neurological Research, Tehran, Iran. ,Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
| |
Collapse
|
5
|
Karkheiran S, Hubert B, Moghaddam H, Darvish H, Paisán-Ruiz C. Phenotypic heterogeneity and full penetrance in a family with dopa-responsive dystonia. Clin Genet 2012; 83:392-4. [PMID: 22775298 DOI: 10.1111/j.1399-0004.2012.01915.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
6
|
Ohadi M, Mirabzadeh A, Esmaeilzadeh-Gharehdaghi E, Rezazadeh M, Hosseinkhanni S, Oladnabi M, Firouzabadi SG, Darvish H. Novel evidence of the involvement of calreticulin in major psychiatric disorders. Prog Neuropsychopharmacol Biol Psychiatry 2012; 37:276-81. [PMID: 22507216 DOI: 10.1016/j.pnpbp.2012.02.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [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: 01/16/2012] [Revised: 02/12/2012] [Accepted: 02/14/2012] [Indexed: 12/20/2022]
Abstract
Calreticulin (CALR) is a multi-functional protein that is strictly conserved across species. Two mRNA transcripts have been recognized for the CALR gene in humans, which use a common promoter sequence. We have recently reported mutations in the CALR promoter that co-occur with psychosis. One of those mutations at -220A increases gene expression in human BE(2)-C and HEK-293 cell lines. This mutation is the first instance of a functional cognition-deficit mutation reversing a human gene promoter to the primitive type. In the current study, we analyzed the effect of the most widely-used mood-stabilizing drug, valproic acid (VPA), on nucleotide -220 in two neuronal cell lines, LAN-5 and N2A. Remarkably, VPA increased gene expression in the cells with the wild-type -220C construct, whereas a dramatic decrease in gene expression was observed in the cell lines with the mutant construct (p<0.000004 and p<0.016, respectively). We also sequenced the 600-bp CALR promoter, and the highly conserved intron 1 sequence in an independent sample of patients afflicted with major psychiatric disorders and controls. A new case of major depressive disorder with psychotic features with the -220A mutation was identified. A novel 1-bp insertion was also detected in intron 1 at IVSI-310, in a case of amphetamine-induced psychosis. As for the psychosis-linked CALR promoter mutations identified to-date, the IVSI mutation was not detected in the control pool. This mutation creates a RREB-1 transcription factor binding site within the first intron. Our present findings identify the site of action of VPA in the CALR promoter, and introduce a novel mutation in a case of substance-induced psychosis in the first intron of CALR.
Collapse
Affiliation(s)
- M Ohadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
| | | | | | | | | | | | | | | |
Collapse
|
7
|
Heidari A, Hosseinkhani S, Talebi S, Meshkani R, Esmaeilzadeh-Gharedaghi E, Banan M, Darvish H, Ohadi M. Haplotypes across the human caveolin 1 gene upstream purine complex significantly alter gene expression: implication in neurodegenerative disorders. Gene 2012; 505:186-9. [PMID: 22659071 DOI: 10.1016/j.gene.2012.05.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 05/04/2012] [Accepted: 05/11/2012] [Indexed: 12/19/2022]
Abstract
We have previously reported a polymorphic purine complex at the 1.5 kb upstream region of the human caveolin 1 (CAV1) gene that is conserved across several species in respect with sequence motifs and the location of the complex. The IRF and Ets transcription factors have common binding sites for this region across those species. We have also shown skew in the homozygote haplotype compartment of this complex in two neurodegenerative disorders, sporadic late-onset Alzheimer's disease (AD), and multiple sclerosis (MS), versus disease-free controls (p<0.0000001). In the current study, we analyze the functional implication of the disease homozygote haplotypes (i.e. 102-bp and 142-bp) vs. control homozygote haplotype (110-bp) in three neuronal cell lines, LAN-5, U-87 MG, and N2A, using dual luciferase reporter system. A significant increase in gene expression was observed in the cell lines with the disease haplotype constructs vs. control haplotype in the three cell lines (t-test p<4 × 10(-4), 1 × 10(-6), and 3 × 10(-4)), respectively. We conclude that the human CAV1 upstream purine complex modifies gene expression. An additive effect of the haplotypes in the homozygous status is speculated based on the skew in the homozygote haplotypes in neurodegenerative disorders.
Collapse
Affiliation(s)
- A Heidari
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Soltani Banavandi MJ, Kahrizi K, Behjati F, Mohseni M, Darvish H, Bahman I, Abedinni SS, Ghasemi Firouzabadi S, Jafari E, Ghadami S, Sabbagh F, Kavoosi GR, Najmabadi H. Investigation of genetic causes of intellectual disability in kerman province, South East of iran. Iran Red Crescent Med J 2012; 14:79-85. [PMID: 22737560 PMCID: PMC3372047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2011] [Accepted: 10/12/2011] [Indexed: 11/30/2022]
Abstract
BACKGROUND Intellectual disability (ID) has a worldwide prevalence of 1-3% and results from extraordinary heterogeneous. To shed more light on the causes of ID in Kerman Province, in Southeast Iran, we set out in 2008 to perform systematic clinical studies and homozygosity mapping in large Iranian families with ID. METHODS Fifty seven families with a minimum of two mentally retarded children from Kerman Province were initially tested for metabolic disorders, by Tandem mass spectrometry. Fragile X testing and standard karyotyping were performed for all probands of families. Cases with autosomal recessive (AR) pattern of inheritance and microcephaly were subjected to homozygosity mapping by using several microsatellite markers for known MCPH loci. RESULTS Three out of seven families with X-linked pattern of inheritance were positive for fragile X syndrome. Chromosome abnormality was not observed in any of dysmorphic patients and all families were negative for metabolic tests. Among the remaining 50 families of AR ID, six were found to be microcephalic, of which 2 linked to two MCPH loci (33.3%). The rest 4 families were not linked to any of the known loci. CONCLUSION The results of this study showed that ID with microcephaly comprised 12% of ID cases in Kerman Province. In two families with apparent linkage to the MCPH5 and MCPH6 locus, mutation screening was not successful, which might indicate that either the mutation is located in the regulatory sequences of the gene or that there might be another genes present in these regions, which is mutated in such cases.
Collapse
Affiliation(s)
- M J Soltani Banavandi
- Faculty of Basic Science, Science and Research Branch, Islamic Azad University, Fars, Iran,Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - K Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - F Behjati
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - M Mohseni
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - H Darvish
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - I Bahman
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - S S Abedinni
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - S Ghasemi Firouzabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - E Jafari
- Deptartment of Microbiology, Faculty of Basic Science, Islamic Azad University, Kerman Branch, Kerman, Iran
| | - Sh Ghadami
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - F Sabbagh
- Genetics Counseling Center, Welfare Organization of Kerman Province, Kerman, Iran
| | - Gh R Kavoosi
- Institute of Biotechnology, University of Shiraz, Shiraz, Iran
| | - H Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran,Correspondence: Hossein Najmabadi, PhD, Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Tel.: +98-21-22180138, Fax: +98-21-22180138, E-mail:
| |
Collapse
|
9
|
Heidari A, Behmanesh M, Sahraian M, Meshkani R, Darvish H, Najmabadi H, Ohadi M. The human caveolin 1 gene upstream purine complex and neurodegeneration—A common signature. J Neuroimmunol 2011; 236:106-10. [DOI: 10.1016/j.jneuroim.2011.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2011] [Revised: 05/08/2011] [Accepted: 05/09/2011] [Indexed: 11/17/2022]
|
10
|
Darvish H, Nabi MO, Firouzabadi SG, Karimlou M, Heidari A, Najmabadi H, Ohadi M. Exceptional human core promoter nucleotide compositions. Gene 2011; 475:79-86. [PMID: 21277957 DOI: 10.1016/j.gene.2010.12.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 12/22/2010] [Accepted: 12/27/2010] [Indexed: 11/28/2022]
Abstract
The proximal promoter sequences contain basic motifs for the expression of the downstream genes. We present genome-scale computational analyses of the 120-bp immediate upstream sequences to the +1 transcription start sites (TSSs) of 10,117 human protein-coding genes, and unravel exceptional genes in respect with the core promoter nucleotide composition. Our data reveal that while in 99% of the genes the absolute purine/pyrimidine ratio ranges between 0.2 and 2.5, certain genes show exceptional skew in this balance (e.g. ratios of 82.3 in VWA3A, 61.5 in Sox5, and 24.0 in BRWD3), and consist of islands of purines or pyrimidines. Furthermore, while over 95% of the genes lack more than one short tandem repeat (STR) in their core promoters, certain gene promoters are exceptionally rich in multiple STRs (e.g. eight consecutive STRs in UBE2QL1, and six STRs in GRIA2). We found sequence bias for the majority of those promoters across species, supporting functional roles for them in gene expression. Genes downstream to those promoters were also found to be of ontologic importance (i.e. we were able to track the majority of those genes to the lower species such as Saccharomyces cerevisiae and Caenorhabditis elegans). The exceptional promoters presented in this study lack the conventional motifs for the TATA, and TATA-less promoters, hence offering novel mechanisms for gene expression. They may also provide potential mechanisms for inter-individual variations in gene expression, and complex traits/disorders.
Collapse
Affiliation(s)
- H Darvish
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | | | | | | | | | | | | |
Collapse
|
11
|
Darvish H, Esmaeeli-Nieh S, Monajemi GB, Mohseni M, Ghasemi-Firouzabadi S, Abedini SS, Bahman I, Jamali P, Azimi S, Mojahedi F, Dehghan A, Shafeghati Y, Jankhah A, Falah M, Soltani Banavandi MJ, Ghani M, Ghani-Kakhi M, Garshasbi M, Rakhshani F, Naghavi A, Tzschach A, Neitzel H, Ropers HH, Kuss AW, Behjati F, Kahrizi K, Najmabadi H. A clinical and molecular genetic study of 112 Iranian families with primary microcephaly. J Med Genet 2010; 47:823-8. [PMID: 20978018 DOI: 10.1136/jmg.2009.076398] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Primary microcephaly (MCPH) is a genetically heterogeneous disorder showing an autosomal recessive mode of inheritance. Affected individuals present with head circumferences more than three SDs below the age- and sex-matched population mean, associated with mild to severe mental retardation. Five genes (MCPH1, CDK5RAP2, ASPM, CENPJ, STIL) and two genomic loci, MCPH2 and MCPH4, have been identified so far. METHODS AND RESULTS In this study, we investigated all seven MCPH loci in patients with primary microcephaly from 112 Consanguineous Iranian families. In addition to a thorough clinical characterisation, karyotype analyses were performed for all patients. For Homozygosity mapping, microsatellite markers were selected for each locus and used for genotyping. Our investigation enabled us to detect homozygosity at MCPH1 (Microcephalin) in eight families, at MCPH5 (ASPM) in thirtheen families. Three families showed homozygosity at MCPH2 and five at MCPH6 (CENPJ), and two families were linked to MCPH7 (STIL). The remaining 81 families were not linked to any of the seven known loci. Subsequent sequencing revealed eight, 10 and one novel mutations in Microcephalin, ASPM and CENPJ, respectively. In some families, additional features such as short stature, seizures or congenital hearing loss were observed in the microcephalic patient, which widens the spectrum of clinical manifestations of mutations in known microcephaly genes. CONCLUSION Our results show that the molecular basis of microcephaly is heterogeneous; thus, the Iranian population may provide a unique source for the identification of further genes underlying this disorder.
Collapse
Affiliation(s)
- H Darvish
- Genetics Research Centre, University of Social Welfare and Rehabilitation Sciences, Kodakyar Street, Daneshjo Ave, Tehran, Iran
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
|