2-Methyl-3-Hydroxybutyryl-CoA Dehydrogenase Deficiency Is Caused by Mutations in the HADH2 Gene  Rob Ofman, P.N. Jos Ruiter, Marike Feenstra, Marinus.

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2-Methyl-3-Hydroxybutyryl-CoA Dehydrogenase Deficiency Is Caused by Mutations in the HADH2 Gene  Rob Ofman, P.N. Jos Ruiter, Marike Feenstra, Marinus Duran, Tien Bwee Poll-The, Johannes Zschocke, Regina Ensenauer, Willy Lehnert, Jörn Oliver Sass, Wolfgang Sperl, J.A. Ronald Wanders  The American Journal of Human Genetics  Volume 72, Issue 5, Pages 1300-1307 (May 2003) DOI: 10.1086/375116 Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 1 Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of bovine liver MHBD. MHBD was purified from bovine liver and analyzed using SDS-PAGE (Laemmli 1970) followed by silver staining (Rabilloud et al. 1988). Lane 1, molecular weight markers; Lane 2, purified bovine liver MHBD. The American Journal of Human Genetics 2003 72, 1300-1307DOI: (10.1086/375116) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 2 Detection of HADH2 388C→T mutation by RFLP analysis. The zygosity of the 388C→T mutation found in patients 2 and 3 (table 1) was studied using RFLP analysis. Genomic DNA was amplified using the primers 2284HADH2frw plus “M13 reverse”-tagged Ex3/4rev. PCR conditions were as described for the other genomic DNA amplifications. After amplification, the PCR products were incubated for 2 h at 37°C in the presence (+) or absence (−) of 10 units of BglII, and, afterward, the restriction products were separated on a 2% agarose gel. The American Journal of Human Genetics 2003 72, 1300-1307DOI: (10.1086/375116) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 3 Detection of the HADH2 364C→G mutation by RFLP analysis in a family with MHBD deficiency. The presence of the 364C→G mutation found in patient 4 (table 1) was studied in other family members (father, mother, brother, and sister) and two unrelated control subjects. Therefore, fragment 2 was amplified from genomic DNA, followed by an incubation in the presence (+) or absence (−) of the restriction enzyme HinfI. Finally, the restriction fragments were separated on a 2% agarose gel. The American Journal of Human Genetics 2003 72, 1300-1307DOI: (10.1086/375116) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 4 Immunological detection of MHBD in cultured skin fibroblasts from patients with MHBD deficiency. For immunoblot analysis, 50 μg protein of cultured skin fibroblasts from control subjects and patients with MHBD deficiency was applied on a 10% polyacrylamide gel and separated, as described elsewhere (Laemmli 1970). After electrophoresis, proteins were transferred to a nitrocellulose membrane by semidry blotting, probed with the polyclonal antibody raised against recombinant human MHBD, and developed (Wanders et al. 1995). After staining of the blot with NBT/BCIP, the result was digitalized by use of a desktop scanner and the amount of MHBD protein quantified, using the National Insitutes of Health Image 1.62 software program. CRIM = cross reactive immunological material. Control-mean value of three control subjects represented as 100% (±SD); 1 = patient 1; 2 = patient 2; 3 = patient 3, and 5 = patient 5 (see table 1). The American Journal of Human Genetics 2003 72, 1300-1307DOI: (10.1086/375116) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 5 Heterologous expression of human MHBD in E. coli. The complete ORF of HADH2 from a control subject and from patients with MHBD deficiency were amplified and ligated into the bacterial expression vector pMAL-C2X, as described. Each ORF was sequenced to exclude sequence errors introduced during PCR. Transformed bacteria (INVα) were grown in 20-ml LB medium supplemented with 100 μg/ml ampicillin to an OD600 of ∼0.5, and IPTG was added to a final concentration of 1 mM to induce protein expression. After 4 h at 37°C, cells were pelleted and resuspended in 1 ml 10 mM sodium phosphate buffer pH 7.4, containing 140 mM NaCl, 0.1% (wt/vol) Triton X-100 and protease inhibitors (1 tablet Completemini [Boehringer Mannheim] in 10-ml solution). Lysis was achieved by sonication at 9 W for 10 s. The bacterial lysate was centrifuged for 10 min at 14,000×g av, and the pellet was discarded. The supernatant was used for protein measurement and MHBD activity, as described. Expression levels of the fusion protein in the bacterial extracts were equal, on the basis of immunoblot analysis (data not shown). pMAL = expression with empty pMAL-c2x vector; pHADH2 = expression with vector containing the wild-type human MHBD; pHADH2 388C→T = expression of human MHBD mutant with R130C; pHADH2 364C→G = expression of human MHBD mutant with L122V. The American Journal of Human Genetics 2003 72, 1300-1307DOI: (10.1086/375116) Copyright © 2003 The American Society of Human Genetics Terms and Conditions