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Baird PN, Guymer RH, Chiu D, Vincent AL, Alexander WS, Foote SJ, Hilton DJ. Generating mouse models of retinal disease using ENU mutagenesis. Vision Res 2002; 42:479-85. [PMID: 11853764 DOI: 10.1016/s0042-6989(01)00232-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We used the chemical mutagen, N-ethyl-N-nitrosourea, to induce random point mutations in the germline of the mouse strain C57BL/6 in order to generate models of retinal diseases. 1163 mutagenised first generation mice produced using this approach were examined for eye abnormalities. Approximately one-third (412) presented with some form of ocular abnormality. Most changes were unilateral and confined to the anterior segment of the eye. Less than 10% (44) of identified changes affected the posterior segment of the eye. 21 mice with varying ocular abnormalities, including 17 with retinal changes, were bred to produce second generation mice to confirm genetic inheritance. Genetic inheritance was confirmed in several of these lines including three with retinal changes.
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McCarty CA, Mukesh BN, Guymer RH, Baird PN, Taylor HR. Cholesterol-lowering medications reduce the risk of age-related maculopathy progression. Med J Aust 2001; 175:340. [PMID: 11665952 DOI: 10.5694/j.1326-5377.2001.tb143604.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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153
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Craig JE, Baird PN, Healey DL, McNaught AI, McCartney PJ, Rait JL, Dickinson JL, Roe L, Fingert JH, Stone EM, Mackey DA. Evidence for genetic heterogeneity within eight glaucoma families, with the GLC1A Gln368STOP mutation being an important phenotypic modifier. Ophthalmology 2001; 108:1607-20. [PMID: 11535458 DOI: 10.1016/s0161-6420(01)00654-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
OBJECTIVE To investigate the phenotype and age-related penetrance of primary open-angle glaucoma (POAG) in Australian families with the most common Myocilin mutation (Gln368STOP). DESIGN Cross-sectional genetic study. PARTICIPANTS Eight pedigrees carrying the Gln368STOP mutation were ascertained from 1730 consecutive cases of POAG in the Glaucoma Inheritance Study in Tasmania. METHODS Index cases and available family members were examined for signs of glaucoma, and the presence of the GLC1A Gln368STOP mutation was ascertained by single-strand conformation polymorphism analysis and subsequent direct sequencing. RESULTS From the eight pedigrees, 29 Gln368STOP mutation-carrying individuals with either ocular hypertension (OHT) or POAG were found, with a mean age at diagnosis of 52.4 +/- 12.9 years and a mean peak intraocular pressure (IOP) of 28.4 +/- 4.7 mmHg. A further 11 mutation carriers older than 40 years have been studied, who as yet show no signs of OHT or POAG. Within the 8 pedigrees, a further 31 individuals with OHT or POAG were identified who did not carry the Gln368STOP mutation. For these individuals the mean age at diagnosis was higher (62.3 +/- 13.7 years, P < 0.01), and the mean peak IOP was lower (25.4 +/- 6.4 mmHg, P = 0.01). For Gln368STOP carriers, age-related penetrance for OHT or POAG was 72% at age 40 years and 82% at age 65 years. A positive family history of POAG was present in all index cases. Five of the eight pedigrees had a positive family history on both maternal and paternal sides. Seven of the eight pedigrees had one or more individuals with POAG who did not carry the mutation. Eight of the 29 Gln368STOP carriers with OHT or POAG had undergone trabeculectomy. CONCLUSIONS The GLC1A Gln368STOP mutation is associated with POAG, which in the pedigrees studied is of a younger age of onset and higher peak IOP than non-mutation glaucoma cases. In addition, Gln368STOP mutation glaucoma cases were more likely to have undergone glaucoma drainage surgery. We have not observed simple autosomal dominant inheritance patterns for POAG in these pedigrees. Other factors, as yet uncharacterized, are involved in expression of the POAG phenotype in Gln368STOP pedigrees.
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Guymer RH, Héon E, Lotery AJ, Munier FL, Schorderet DF, Baird PN, McNeil RJ, Haines H, Sheffield VC, Stone EM. Variation of codons 1961 and 2177 of the Stargardt disease gene is not associated with age-related macular degeneration. ARCHIVES OF OPHTHALMOLOGY (CHICAGO, ILL. : 1960) 2001; 119:745-51. [PMID: 11346402 DOI: 10.1001/archopht.119.5.745] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVES To investigate the role of 2 specific alleles of the Stargardt disease gene (ABCA4) in the pathogenesis of age-related macular degeneration (AMD). Secondary objectives were to investigate differences in frequency of the G1961E allele in selected ethnic groups as well as to examine the segregation of both G1961E and D2177N alleles in 5 multiplex families with AMD. METHODS Five hundred forty-four patients with AMD and 689 controls were ascertained from 3 continents. Blood samples from 62 normal individuals of Somalian ancestry were also obtained. Participants were screened for the presence of these ABCA4 alleles with a combination of restriction digestion and single-strand conformation polymorphism analysis of polymerase chain reaction amplification products. Detected alleles were confirmed by DNA sequencing. The number of subjects exhibiting the G1961E or D2177N variants were compared between AMD and control groups using a 2-tailed Fisher exact test. RESULTS There was no significant difference (P >.1) in the frequency of the G1961E and D2177N alleles in patients with AMD (2.2%) vs controls (1.0%). In contrast, there was a significant difference (P< .001) in the frequency of the G1961E alleles between normal individuals of Somali ancestry (11.3%) and normal individuals from other populations (0.4%). There was no evidence of cosegregation of these alleles and the AMD phenotype in the 5 multiplex families with AMD examined. These two ABCA4 alleles were slightly more frequent in patients with AMD with choroidal neovascularization (2.7%) than those without this complication (2.5%). CONCLUSIONS Somali ancestry is more than 100 times more strongly associated with presence of the G1961E allele than the AMD phenotype. This study did not find any statistically significant evidence for involvement of the G1961E or D2177N alleles of the ABCA4 gene in AMD. CLINICAL RELEVANCE The ABCA4 gene is definitively involved in the pathogenesis of Stargardt disease and some cases of photoreceptor degeneration. However, it does not seem to be involved in a statistically significant fraction of AMD cases.
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Baird PN, Dickinson J, Craig JE, Mackey DA. The Taa1 restriction enzyme provides a simple means to identify the Q368STOP mutation of the myocilin gene in primary open angle glaucoma. Am J Ophthalmol 2001; 131:510-1. [PMID: 11292420 DOI: 10.1016/s0002-9394(00)00812-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
PURPOSE To identify a rapid and reliable method to detect the Glutamine 368 STOP (Q368STOP) disease-predisposing allele of the myocilin gene associated with adult onset, primary, open-angle glaucoma. METHODS Individuals with the Q368STOP mutation of the myocilin gene were identified from a cohort of primary open-angle glaucoma patients from Tasmania and subjected to Taa1 restriction digestion. RESULTS In the Tasmanian family presented, screening with the Taa1 restriction enzyme successfully confirmed identification of all individuals with the Q368STOP mutation. CONCLUSIONS The use of the Taa1 restriction enzyme offers a relatively simple, rapid, and reproducible technique that could be applied to detect the Q368STOP mutation of the myocilin gene.
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Baird PN, Simmons PJ. Expression of the Wilms' tumor gene (WT1) in normal hemopoiesis. Exp Hematol 1997; 25:312-20. [PMID: 9131006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The Wilms tumor suppressor gene (WT1) is mutated in a number of cases of Wilms' tumor as well as in mesothelioma and leukemia. It encodes a transcription factor derived from any one of four alternate transcripts. WT1 has a restricted pattern of expression within the body and within the hemopoietic system its expression is limited to primitive leukemias and a number of leukemic cell lines. Given the overexpression of WT1 in leukemias, we have addressed the question of whether this gene is expressed within the normal hemopoietic system. Mononuclear bone marrow (BM) cells obtained from normal donors were separated by fluorescence-activated cell sorting (FACS) into "primitive" (CD34+) and "mature" (CD34-) cell populations. Total RNA extracted from these cells was subjected to reverse transcriptase polymerase chain reaction (RT-PCR) using primers based on the WT1 sequence, to examine the expression of this gene within the hemopoietic system. Phenotypic purity of cells was guaranteed by performing single-cell sorting followed by RT-PCR to define the precise cellular phenotypes that express WT1. Expression of WT1 was detected in cells bearing the CD34+ phenotype but not in those cells lacking expression of CD34. In addition, single-cell analysis revealed that expression of WT1 occurred in the candidate stem cell-containing population of hemopoietic cells which have the phenotype CD34+ CD38-. Moreover, the single-cell RT-PCR analysis also demonstrated that differential expression of alternate transcripts of WT1 occurs between hemopoietic progenitor cells with the same phenotype. In conclusion, expression of WT1 is limited to early progenitors of the blood system, which suggests that this gene plays a critical role in hemopoietic development.
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Baird PN, D'Andrea RJ, Goodall GJ. Cytokine receptor genes: structure, chromosomal location, and involvement in human disease. Leuk Lymphoma 1995; 18:373-83. [PMID: 8528043 DOI: 10.3109/10428199509059635] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Haemopoietic cytokines regulate haemopoietic cell function via specific cell surface receptors. These receptors are members of a large superfamily of transmembrane proteins and are characterised by a 200 amino acid extracellular sequence encoding the ligand binding domain. Several of the genes for members of this superfamily have now been characterised at the molecular level revealing a highly conserved organisation and a number of these genes have been localised cytogenetically. The recent finding that genes for the IL-3 and GM-CSF receptor alpha chain subunits colocalise to a small region of the pseudoautosomal region and the observation that the LIF receptor locus is present in a cluster of receptor genes on chromosome 5 suggest the possibility that subsets of cytokine receptor genes may be organised into clusters. This possibility is discussed and the potential significance of cytokine receptor gene clusters is assessed. Several of the receptor genes are known to be involved in inherited disorders and there is evidence to suggest lesions in cytokine receptor genes could have a role in leukaemia. We review the gene organisation, localisation and involvement in disease for the known cytokine receptor loci. This large family of receptors is expanding with the steady discovery of new members--all of which have the potential to be involved in human disorders.
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Baird PN, Pritchard J, Cowell JK. Molecular genetic analysis of chromosome 11p in familial Wilms tumour. Br J Cancer 1994; 69:1072-7. [PMID: 7911030 PMCID: PMC1969446 DOI: 10.1038/bjc.1994.210] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
In the family reported here, a mother and both of her children developed a Wilms tumour, and all three tumours were of the relatively rare monomorphous epithelial histopathological subtype. Using restriction fragment length polymorphism analysis, both sibs were shown to inherit the same maternal allele from the 11p13 region but different maternal alleles from the 11p15 region. Using a combination of single-strand conformation polymorphism (SSCP) and polymerase chain reaction (PCR) sequencing techniques, no mutations were identified in the WT1 tumour-suppressor gene from the 11p13 region, but a novel polymorphism was identified in exon 1. mRNA expression studies using the insulin-like growth factor II (IGF-II) gene, located in 11p15, showed that there was no relaxation of imprinting at this locus. There was also no evidence of loss of heterozygosity on the long arm of chromosome 16. These findings indicate that the WT1 and IGF-II genes, together with the long arm of chromosome 16, are not directly implicated in tumorigenesis in this Wilms family, but that a recombination event has occurred on the short arm of chromosome 11.
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Baird PN, Cowell JK. A novel zinc finger mutation in a patient with Denys-Drash syndrome. Hum Mol Genet 1993; 2:2193-4. [PMID: 8111391 DOI: 10.1093/hmg/2.12.2193] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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Santos A, Osorio-Almeida L, Baird PN, Silva JM, Boavida MG, Cowell J. Insertional inactivation of the WT1 gene in tumour cells from a patient with WAGR syndrome. Hum Genet 1993; 92:83-6. [PMID: 8396067 DOI: 10.1007/bf00216151] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The WT1 gene was analysed using DNA from a Wilms' tumour derived from a patient with the WAGR syndrome using single strand conformation polymorphism analysis and polymerase chain reaction sequencing. A 14-bp insertion was found in the intron part of the splice donor site of exon 7 and was a tandem duplication of an upstream exon sequence. This mutation would be expected to disrupt the correct processing of the WT1 mRNA and is predicted to result in a non-functional protein. This observation further supports the role of WT1 in Wilms' tumorigenesis in patients with constitutional 11p13 deletions.
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161
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Groves N, Baird PN, Hogg A, Cowell JK. A single base pair polymorphism in the WT1 gene detected by single-strand conformation polymorphism analysis. Hum Genet 1992; 90:440-2. [PMID: 1483703 DOI: 10.1007/bf00220474] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The Wilms' tumor predisposition gene, WT1, was analysed exon-by-exon in a variety of tumours using the single-strand conformation polymorphism (SSCP) technique. A consistent variation in the usual band pattern for exon 7 was detected in this survey. On sequencing, a silent mutation was noted in codon 313 resulting in an A-->G transition in an arginine codon. The A-->G transition destroys an AflIII restriction enzyme recognition site, which provides a rapid means of identifying heterozygotes at this locus. Analysis of the segregation of this polymorphism in families demonstrated a co-dominant inheritance pattern. In an analysis of 21 randomly selected individuals 25% were heterozygous at this locus, which makes this polymorphism useful in a variety of genetic analyses.
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Baird PN, Groves N, Haber DA, Housman DE, Cowell JK. Identification of mutations in the WT1 gene in tumours from patients with the WAGR syndrome. Oncogene 1992; 7:2141-9. [PMID: 1331933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Individuals with constitutional, heterozygous deletions of chromosome region 11p13 are predisposed to the development of Wilms' tumour, indicating the site of the tumour predisposition gene. The WT1 gene is a candidate for this cancer predisposition gene. If this gene is truly involved in tumorigenesis it would be expected to be mutant in tumour tissue from patients with 11p13 deletions. We have used single-stranded conformation polymorphism (SSCP) and polymerase chain reaction sequencing to test this hypothesis in an exon-by-exon analysis of the gene. Four tumours were analysed, two of which were from unilaterally affected individuals and two from a bilaterally affected patient. SSCP analysis identified mutations in the two unilateral tumours which, on sequencing, were shown to involve a 10-bp insertion in exon 7 and a single base pair change in exon 8. Both mutations result in the generation of premature stop codons and the predicted proteins would lack part of the zinc finger motif. Despite complete sequencing of the WT1 gene in both of the bilateral tumours, no mutations were identified. These results possibly suggest that WT1 may not be involved in tumorigenesis in all tumours. All four tumours retained heterozygosity in the 11p15 region, making it unlikely that a second recessive oncogene in this region was involved in tumorigenicity.
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Onadim Z, Hogg A, Baird PN, Cowell JK. Oncogenic point mutations in exon 20 of the RB1 gene in families showing incomplete penetrance and mild expression of the retinoblastoma phenotype. Proc Natl Acad Sci U S A 1992; 89:6177-81. [PMID: 1352883 PMCID: PMC402145 DOI: 10.1073/pnas.89.13.6177] [Citation(s) in RCA: 93] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The retinoblastoma-predisposition gene, RB1, segregates as an autosomal dominant trait with high (90%) penetrance. Certain families, however, show an unusual low-penetrance phenotype with many individuals being unaffected, unilaterally affected, or with evidence of spontaneously regressed tumors. We have used single-strand conformation polymorphism analysis and PCR sequencing to study two such families. Mutations were found in exon 20 of RB1 in both cases. In one family a C----T transition in codon 661 converts an arginine (CGG) to a tryptophan (TGG) codon. In this family, incomplete penetrance and mild phenotypic expression were observed in virtually all patients, possibly indicating that single amino acid changes may modify protein structure/function such that tumorigenesis is not inevitable. In the second family the mutation in codon 675 is a G----T transversion that converts a glutamine (GAA) to a stop (TAA) codon. However, this mutation also occurs near a potential cryptic splice acceptor site, raising the possibility of alternative splicing resulting in a less severely disrupted protein.
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Baird PN, Santos A, Groves N, Jadresic L, Cowell JK. Constitutional mutations in the WT1 gene in patients with Denys-Drash syndrome. Hum Mol Genet 1992; 1:301-5. [PMID: 1338906 DOI: 10.1093/hmg/1.5.301] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The Denys-Drash syndrome is characterised by a typical nephropathy, genital abnormalities and also predisposes to the development of Wilms' tumor. These patients eventually go into end stage renal failure. A candidate Wilms' tumor gene, WT1, from the 11p13 chromosome region has recently been cloned. We have analysed the DNA sequence in constitutional cells from eight patients and have shown heterozygous mutations in six of them. Four of the mutations were in exon 9, all resulting in missense mutations. Three were at nucleotide position 1180 resulting in an arg > trp amino acid change. The other was at position 1186 converting an asp > asn in the predicted resultant protein. One patient had a missense mutation in exon 8, converting an arg > his. A single base pair insertion at nucleotide position 821 in exon 6 resulted in the generation of a premature stop codon in the last patient. We were unable to find a mutation in one patient despite complete sequencing of the genomic sequence of the gene. The last patient carried a constitutional deletion of the 11p13 region and no additional mutation was found. There was no obvious correlation between the type of mutation and phenotypic expression. These results further demonstrate that the WT1 gene is important in both the development of the kidney and the genito-urinary system.
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Hogg A, Onadim Z, Baird PN, Cowell JK. Detection of heterozygous mutations in the RB1 gene in retinoblastoma patients using single-strand conformation polymorphism analysis and polymerase chain reaction sequencing. Oncogene 1992; 7:1445-51. [PMID: 1352398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Several families segregating the autosomal dominant form of the hereditary retinoblastoma predisposition gene have been analysed for the causative mutation. We have used the single-strand conformation polymorphism (SSCP) technique to screen for mutations, exon by exon, in the RB1 gene in affected patients from these families. The SSCP technique has proved a rapid and simple technique which relies on the sequence-dependent migration of single-stranded DNA in a non-denaturing polyacrylamide gel. Oligonucleotide primers flanking all 27 exons and the promoter region of the RB1 gene are reported here. The polymerase chain reaction (PCR)-amplified products range in size from 212 to 625 bp and include a flanking intron sequence which allows detection of mutations in these regions. The sensitivity of SSCP is optimal when DNA fragments are approximately 200 bp long. Consequently, restriction enzyme sites for each amplified region were identified, reducing the size of the PCR products analysed to less than 250 bp. Bands with aberrant migration patterns were observed on SSCP gels in the lymphocyte DNA from two patients with bilateral, familial retinoblastoma. Sequence analysis of these DNA fragments revealed the causative mutations. These consisted of a 1-bp insertion of a T in the coding strand of exon 20 and a G----A mutation in the coding strand of exon 14. This approach has proved to be a powerful method for the rapid detection of germline mutations in the RB1 gene, a programme which can be extended to individuals with new mutations.
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Cookson MJ, Baird PN, Hall LM, Coates AR. Identification of two unknown reading frames in Synechococcus 6301 as homologues of the 10k and 65k antigen genes of Mycobacterium tuberculosis and related heat shock genes in E. coli and Coxiella burnetii. Nucleic Acids Res 1989; 17:6392. [PMID: 2505234 PMCID: PMC318293 DOI: 10.1093/nar/17.15.6392] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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167
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Baird PN, Hall LM, Coates AR. Cloning and sequence analysis of the 10 kDa antigen gene of Mycobacterium tuberculosis. JOURNAL OF GENERAL MICROBIOLOGY 1989; 135:931-9. [PMID: 2480990 DOI: 10.1099/00221287-135-4-931] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The gene encoding a major protein antigen of Mycobacterium tuberculosis has been cloned and sequenced using oligonucleotide probes derived from the N-terminal sequence of the analogous protein from Mycobacterium bovis BCG. The gene analysis revealed a sequence encoding a protein of 99 amino acid residues, with a molecular mass of 10.7 kDa. Computer prediction suggests that the protein contains three T-cell-determined epitopes (of which one has been demonstrated experimentally) and three B-cell-determined epitopes. The protein sequence was homologous to two prokaryote heat-shock proteins and the gene possessed heat-shock-like promoter sequences upstream of the initiation codon. A hairpin loop identified in the upstream sequence may also be important in regulation of the gene.
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Baird PN, Hall LM, Coates AR. A major antigen from Mycobacterium tuberculosis which is homologous to the heat shock proteins groES from E. coli and the htpA gene product of Coxiella burneti. Nucleic Acids Res 1988; 16:9047. [PMID: 2902558 PMCID: PMC338657 DOI: 10.1093/nar/16.18.9047] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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