Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene
Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency is the most frequent inborn error of metabolism and accounts for 90-95% of CAH cases. In the present work, we analyzed the functional consequence of four novel previously reported point CYP21A2 mutations -p.R132C, p.R149C, p.M283V...
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2014
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v9_n3_p_Taboas http://hdl.handle.net/20.500.12110/paper_19326203_v9_n3_p_Taboas |
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paper:paper_19326203_v9_n3_p_Taboas2023-06-08T16:31:22Z Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene Taboas, Melisa Gomez Acuña, Luciana Ines Scaia, María Florencia Ceballos, Nora Raquel hydroxyprogesterone progesterone steroid 21 monooxygenase CYP21A2 protein, human hydroxyprogesterone messenger RNA primer DNA progesterone steroid 21 monooxygenase allele amino acid substitution Argentinean article bioinformatics congenital adrenal hyperplasia CYP21A2 gene enzyme activity enzyme assay enzyme deficiency ethnicity exon gene function genetic variability heterozygosity human point mutation RNA splicing stop codon wild type biology chemistry congenital adrenal hyperplasia enzyme specificity genetics metabolism pathology point mutation real time polymerase chain reaction reverse transcription polymerase chain reaction Western blotting 17-alpha-Hydroxyprogesterone Adrenal Hyperplasia, Congenital Blotting, Western Computational Biology DNA Primers Humans Point Mutation Progesterone Real-Time Polymerase Chain Reaction Reverse Transcriptase Polymerase Chain Reaction RNA, Messenger Steroid 21-Hydroxylase Substrate Specificity Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency is the most frequent inborn error of metabolism and accounts for 90-95% of CAH cases. In the present work, we analyzed the functional consequence of four novel previously reported point CYP21A2 mutations -p.R132C, p.R149C, p.M283V, p.E431K- found in Argentinean 21-hydroxylase deficient patients. In addition, we report an acceptor splice site novel point mutation, c.652-2A>G, found in a classical patient in compound heterozygosity with the rare p.R483Q mutation. We performed bioinformatic and functional assays to evaluate the biological implication of the novel mutation. Our analyses revealed that the residual enzymatic activity of the isolated mutants coding for CYP21A2 aminoacidic substitutions was reduced to a lesser than 50% of the wild type with both progesterone and 17-OH progesterone as substrates. Accordingly, all the variants would predict mild non-classical alleles. In one non-classical patient, the p.E431K mutation was found in cis with the p.D322G one. The highest decrease in enzyme activity was obtained when both mutations were assayed in the same construction, with a residual activity most likely related to the simple virilizing form of the disease. For the c.652-2A>G mutation, bioinformatic tools predicted the putative use of two different cryptic splicing sites. Nevertheless, functional analyses revealed the use of only one cryptic splice acceptor site located within exon 6, leading to the appearance of an mRNA with a 16 nt deletion. A severe allele is strongly suggested due to the presence of a premature stop codon in the protein only 12 nt downstream. © 2014 Taboas et al. Fil:Taboas, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gómez Acuña, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scaia, M.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ceballos, N.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v9_n3_p_Taboas http://hdl.handle.net/20.500.12110/paper_19326203_v9_n3_p_Taboas |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
hydroxyprogesterone progesterone steroid 21 monooxygenase CYP21A2 protein, human hydroxyprogesterone messenger RNA primer DNA progesterone steroid 21 monooxygenase allele amino acid substitution Argentinean article bioinformatics congenital adrenal hyperplasia CYP21A2 gene enzyme activity enzyme assay enzyme deficiency ethnicity exon gene function genetic variability heterozygosity human point mutation RNA splicing stop codon wild type biology chemistry congenital adrenal hyperplasia enzyme specificity genetics metabolism pathology point mutation real time polymerase chain reaction reverse transcription polymerase chain reaction Western blotting 17-alpha-Hydroxyprogesterone Adrenal Hyperplasia, Congenital Blotting, Western Computational Biology DNA Primers Humans Point Mutation Progesterone Real-Time Polymerase Chain Reaction Reverse Transcriptase Polymerase Chain Reaction RNA, Messenger Steroid 21-Hydroxylase Substrate Specificity |
| spellingShingle |
hydroxyprogesterone progesterone steroid 21 monooxygenase CYP21A2 protein, human hydroxyprogesterone messenger RNA primer DNA progesterone steroid 21 monooxygenase allele amino acid substitution Argentinean article bioinformatics congenital adrenal hyperplasia CYP21A2 gene enzyme activity enzyme assay enzyme deficiency ethnicity exon gene function genetic variability heterozygosity human point mutation RNA splicing stop codon wild type biology chemistry congenital adrenal hyperplasia enzyme specificity genetics metabolism pathology point mutation real time polymerase chain reaction reverse transcription polymerase chain reaction Western blotting 17-alpha-Hydroxyprogesterone Adrenal Hyperplasia, Congenital Blotting, Western Computational Biology DNA Primers Humans Point Mutation Progesterone Real-Time Polymerase Chain Reaction Reverse Transcriptase Polymerase Chain Reaction RNA, Messenger Steroid 21-Hydroxylase Substrate Specificity Taboas, Melisa Gomez Acuña, Luciana Ines Scaia, María Florencia Ceballos, Nora Raquel Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene |
| topic_facet |
hydroxyprogesterone progesterone steroid 21 monooxygenase CYP21A2 protein, human hydroxyprogesterone messenger RNA primer DNA progesterone steroid 21 monooxygenase allele amino acid substitution Argentinean article bioinformatics congenital adrenal hyperplasia CYP21A2 gene enzyme activity enzyme assay enzyme deficiency ethnicity exon gene function genetic variability heterozygosity human point mutation RNA splicing stop codon wild type biology chemistry congenital adrenal hyperplasia enzyme specificity genetics metabolism pathology point mutation real time polymerase chain reaction reverse transcription polymerase chain reaction Western blotting 17-alpha-Hydroxyprogesterone Adrenal Hyperplasia, Congenital Blotting, Western Computational Biology DNA Primers Humans Point Mutation Progesterone Real-Time Polymerase Chain Reaction Reverse Transcriptase Polymerase Chain Reaction RNA, Messenger Steroid 21-Hydroxylase Substrate Specificity |
| description |
Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency is the most frequent inborn error of metabolism and accounts for 90-95% of CAH cases. In the present work, we analyzed the functional consequence of four novel previously reported point CYP21A2 mutations -p.R132C, p.R149C, p.M283V, p.E431K- found in Argentinean 21-hydroxylase deficient patients. In addition, we report an acceptor splice site novel point mutation, c.652-2A>G, found in a classical patient in compound heterozygosity with the rare p.R483Q mutation. We performed bioinformatic and functional assays to evaluate the biological implication of the novel mutation. Our analyses revealed that the residual enzymatic activity of the isolated mutants coding for CYP21A2 aminoacidic substitutions was reduced to a lesser than 50% of the wild type with both progesterone and 17-OH progesterone as substrates. Accordingly, all the variants would predict mild non-classical alleles. In one non-classical patient, the p.E431K mutation was found in cis with the p.D322G one. The highest decrease in enzyme activity was obtained when both mutations were assayed in the same construction, with a residual activity most likely related to the simple virilizing form of the disease. For the c.652-2A>G mutation, bioinformatic tools predicted the putative use of two different cryptic splicing sites. Nevertheless, functional analyses revealed the use of only one cryptic splice acceptor site located within exon 6, leading to the appearance of an mRNA with a 16 nt deletion. A severe allele is strongly suggested due to the presence of a premature stop codon in the protein only 12 nt downstream. © 2014 Taboas et al. |
| author |
Taboas, Melisa Gomez Acuña, Luciana Ines Scaia, María Florencia Ceballos, Nora Raquel |
| author_facet |
Taboas, Melisa Gomez Acuña, Luciana Ines Scaia, María Florencia Ceballos, Nora Raquel |
| author_sort |
Taboas, Melisa |
| title |
Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene |
| title_short |
Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene |
| title_full |
Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene |
| title_fullStr |
Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene |
| title_full_unstemmed |
Functional studies of p.R132C, p.R149C, p.M283V, p.E431K, and a novel c.652-2A>G mutations of the CYP21A2 gene |
| title_sort |
functional studies of p.r132c, p.r149c, p.m283v, p.e431k, and a novel c.652-2a>g mutations of the cyp21a2 gene |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v9_n3_p_Taboas http://hdl.handle.net/20.500.12110/paper_19326203_v9_n3_p_Taboas |
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