Primer Design and PCR Optimization for Full-Exon Amplification of the CPT1A Gene to Support Genetic Diagnosis of Carnitine Palmitoyltransferase 1A Deficiency in Vietnam

Ta Van Thao, Tran Thi Chi Mai, Dang Thi Thanh Mai, Nguyen Dieu Thuy, Nguyen Thi Phuong Thuy, Trinh Thi Phuong Dung

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Abstract

Characterization of Carnitine Palmitoyltransferase 1A gene by  Sanger sequencingCarnitine palmitoyltransferase 1A (CPT1A) deficiency is a rare inherited metabolic disorder causing energy deficiency due to impaired transport of long-chain fatty acids into mitochondria. In Vietnam, no  study on CPT1A gene characteristics have been published. This study designed 19 specific primer pairs to amplify all exons of the CPT1A gene and optimized PCR conditions (primer concentration 0.5 µmol/L, annealing temperature 55°C) for Sanger sequencing. Results showed successful amplification of all 19 exons, with cycle threshold (Ct) values ranging from 16.105 to 23.441 and clear PCR products (228 – 458bp). This study establishes a foundation for genetic diagnosis of CPT1A deficiency in Vietnam, supporting early screening and genetic counseling, and paving the way for clinical applications and integration with Sanger or Next Generation Sequencing (NGS).

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References

1. Marsden D, Bedrosian CL, Vockley J. Impact of newborn screening on the reported incidence and clinical outcomes associated with medium- and long-chain fatty acid oxidation disorders. Genet Med. 2021; 23(5): 816-829. doi:10.1038/s41436-020-01070-0.
2. Lee K, Pritchard A, Ahmad A. Carnitine Palmitoyltransferase 1A Deficiency. In: GeneReviews® [Internet]. University of Washington, Seattle; 2025. Accessed April 18, 2025. https://www.ncbi.nlm.nih.gov/books/NBK1527/.
3. Gillingham MB, Hirschfeld M, Lowe S, et al. Impaired fasting tolerance among Alaska native children with a common carnitine palmitoyltransferase 1A sequence variant. Mol Genet Metab. 2011; 104(3): 261-264. doi:10.1016/j.ymgme.2011.06.017.
4. Brown NF, Mullur RS, Subramanian I, et al. Molecular characterization of L-CPT I deficiency in six patients: insights into function of the native enzyme. J Lipid Res. 2001; 42(7): 1134-1142.
5. Baruteau J, Sachs P, Broué P, et al. Clinical and biological features at diagnosis in mitochondrial fatty acid beta-oxidation defects: a French pediatric study of 187 patients. J Inherit Metab Dis. 2013; 36(5): 795-803. doi:10.1007/s10545-012-9542-6.
6. Merritt JL, Norris M, Kanungo S. Fatty acid oxidation disorders. Ann Transl Med. 2018; 6(24): 473. doi:10.21037/atm.2018.10.57.
7. Gobin S, Bonnefont JP, Prip-Buus C, Mugnier C, Ferrec M, Demaugre F, Saudubray JM, Rostane H, Djouadi F, Wilcox W, Cederbaum S, Haas R, Nyhan WL, Green A, Gray G, Girard J, Thuillier L. Organization of the human liver carnitine palmitoyltransferase 1 gene (CPT1A) and identification of novel mutations in hypoketotic hypoglycaemia. Hum Genet. 2002; 111(2): 179-189. doi:10.1007/s00439-002-0752-0.
8. Bernhardt I, Glamuzina E, Dowsett LK, et al. Genotype-phenotype correlations in CPT1A deficiency detected by newborn screening in Pacific populations. JIMD Rep. 2022; 63(4): 322-329. doi:10.1002/jmd2.12271.
9. Bonnefont JP, Djouadi F, Prip-Buus C, Gobin S, Munnich A, Bastin J. Carnitine palmitoyltransferases 1 and 2: biochemical, molecular and medical aspects. Mol Aspects Med. 2004; 25(5-6): 495-520. doi:10.1016/j.mam.2004.06.004.
10. Tein I, Demaugre F, Bonnefont JP, Saudubray JM. Normal muscle CPT1 and CPT2 activities in hepatic presentation patients with CPT1 deficiency in fibroblasts. J Neurol Sci. 1989; 92(2-3): 229-245. doi:10.1016/0022-510x(89)90139-1.