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Analysis of mRNA expression and cloning of a novel plasma membrane Ca2+-ATPase splice variant in human heart

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Abstract

Four different plasma membrane CA2+-ATPase (PMCA) genes and three sarco(endo)plasmic reticulum Ca 2+-ATPase (SERCA) genes have been previously cloned and characterized. In this study we have investigated the expression of the mRNA encoding the various PMCA and SERCA proteins in fetal and adult human heart and placenta by the reverse-transcriptase-polymerase chain-reaction (RT PCR) and cDNA cloning. We have found that PMCA1 and PMCA4 genes were expressed in 8-, 12- and 20-week fetal heart and in adult heart. PMCA2 gene was expressed at low levels in adult heart but was not detected in fetal heart. PMCA3 mRNA was not detected in the heart nor placenta. In contrast, the mRNA encoding SERCA2a, SERCA2b and SERCA3 were expressed in all cardiac developmental stages. Multiple alternatively spliced mRNA transcripts which differ at splice site A and B/C of the PMCA 1, PMCA2 and PMCA4 genes were detected in the human heart. Interestingly, a novel tissue specific variant of the PMCA4 gene was detected in both fetal and adult human heart but not in placenta that accounts for about 30% of the total PMCA4 mRNA variant expression. DNA sequence analysis of this novel variant revealed that it corresponds to the equivalent of the PMCA 1 d variant and accordingly we have named it PMCA4d. We cloned and sequenced eight cDNA inserts encoding for the PMCA 1 and PMCA4 variants from a fetal human heart cDNA library confirming that these are the two main PMCA genes expressed in cardiac muscle.

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Authors and Affiliations

  1. Division of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, and Department of Physiology, University of Manitoba, 351 Tache Avenue, R2H 2A6, Winnipeg, Manitoba, Canada

    Juan Santiago-García & Angel Zarain-Herzberg

  2. Departmento de Bioenergética, Instituto de Fisiologia Celular, Universidad Nacional Autonóma de México, Apartado Postal 70-243, 04510, D.F.

    Juan Santiago-García & Jaime Mas-Oliva

  3. Hospital General Dr. Manuel Gea Gonzalez, Calzada de Tlalpan 4800, D.F, 14000, México

    Dolores Saavedra

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  1. Juan Santiago-García
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  2. Jaime Mas-Oliva
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  3. Dolores Saavedra
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  4. Angel Zarain-Herzberg
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Santiago-García, J., Mas-Oliva, J., Saavedra, D. et al. Analysis of mRNA expression and cloning of a novel plasma membrane Ca2+-ATPase splice variant in human heart. Mol Cell Biochem 155, 173–182 (1996). https://doi.org/10.1007/BF00229314

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  • DOI: https://doi.org/10.1007/BF00229314

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