Gen SLC22A5 kodira plazmatski integralni membranski protein koji funkcionira i kao transporter organskih kationa i transporter visokog afiniteta karnitina ovisnog o natriju.[5] Kodirani protein uključen je u aktivno ćelijsko preuzimanje karnitina, prenoseći jedan natrijev ion s jednom molekulom karnitina. Organski kationi koji se prenose ovim proteinom uključuju tetraetilamonij (TEA) bez uključivanja natrija. Odnos relativne aktivnosti preuzimanja karnitina i TEA je 11,3.[12]
Pacijenti mogu biti asimptomski, pri čemu oko 70% takvih pacijenata ima misens mutacije ili delecije; učestalost nonsens mutacija je povećana kod simptomskih pacijenata.[15] Simptomi i ishod bolesti mogu se drastično poboljšati zamjenskom terapijom, uzimanjem L-karnitina.[16] Procijenjena incidencija primarnog nedostatka karnitina u novorođenčadi je oko 1/40.000.[17]
^Wu X, Prasad PD, Leibach FH, Ganapathy V (maj 1998). "cDNA sequence, transport function, and genomic organization of human OCTN2, a new member of the organic cation transporter family". Biochemical and Biophysical Research Communications. 246 (3): 589–95. doi:10.1006/bbrc.1998.8669. PMID9618255.
^Yilmaz TF, Atay M, Toprak H, Guler S, Aralasmak A, Alkan A (10. 3. 2014). "MRI findings in encephalopathy with primary carnitine deficiency: a case report". Journal of Neuroimaging. 25 (2): 325–328. doi:10.1111/jon.12102. PMID24612242. S2CID35640542.
^Mazzini M, Tadros T, Siwik D, Joseph L, Bristow M, Qin F, Cohen R, Monahan K, Klein M, Colucci W (2011). "Primary carnitine deficiency and sudden death: in vivo evidence of myocardial lipid peroxidation and sulfonylation of sarcoendoplasmic reticulum calcium ATPase 2". Cardiology (jezik: engleski). 120 (1): 52–8. doi:10.1159/000333127. PMID22116472. S2CID207687571.
^Yoon YA, Lee DH, Ki CS, Lee SY, Kim JW, Lee YW, Park HD (2012). "SLC22A5 mutations in a patient with systemic primary carnitine deficiency: the first Korean case confirmed by biochemical and molecular investigation". Annals of Clinical and Laboratory Science. 42 (4): 424–8. PMID23090741.
^Agnetti A, Bitton L, Tchana B, Raymond A, Carano N (januar 2013). "Primary carnitine deficiency dilated cardiomyopathy: 28 years follow-up". International Journal of Cardiology. 162 (2): e34–5. doi:10.1016/j.ijcard.2012.05.038. PMID22658351.
Erguven M, Yilmaz O, Koc S, Caki S, Ayhan Y, Donmez M, Dolunay G (2007). "A case of early diagnosed carnitine deficiency presenting with respiratory symptoms". Annals of Nutrition & Metabolism. 51 (4): 331–4. doi:10.1159/000107675. PMID17726310. S2CID40574037.
Hwu WL, Chien YH, Tang NL, Law LK, Lin CY, Lee NC (oktobar 2007). "Deficiency of the carnitine transporter (OCTN2) with partial N-acetylglutamate synthase (NAGS) deficiency". Journal of Inherited Metabolic Disease. 30 (5): 816. doi:10.1007/s10545-007-0594-y. PMID17703373. S2CID2764651.
Makhseed N, Vallance HD, Potter M, Waters PJ, Wong LT, Lillquist Y, Pasquali M, Amat di San Filippo C, Longo N (2004). "Carnitine transporter defect due to a novel mutation in the SLC22A5 gene presenting with peripheral neuropathy". Journal of Inherited Metabolic Disease. 27 (6): 778–80. doi:10.1023/B:BOLI.0000045837.23328.f4. PMID15617188. S2CID24144621.
Kinali M, Olpin SE, Clayton PT, Daubeney PE, Mercuri E, Manzur AY, Tein I, Leonard J, Muntoni F (2004). "Diagnostic difficulties in a case of primary systemic carnitine deficiency with idiopathic dilated cardiomyopathy". European Journal of Paediatric Neurology. 8 (4): 217–9. doi:10.1016/j.ejpn.2004.03.007. PMID15261886.
Kinali M, Olpin SE, Clayton PT, Daubeney PE, Mercuri E, Manzur AY, Tein I, Leonard J, Muntoni F (2004). "Diagnostic difficulties in a case of primary systemic carnitine deficiency with idiopathic dilated cardiomyopathy". European Journal of Paediatric Neurology. 8 (4): 217–9. doi:10.1016/j.ejpn.2004.03.007. PMID15261886.
Matsuishi T, Hirata K, Terasawa K, Kato H, Yoshino M, Ohtaki E, Hirose F, Nonaka I, Sugiyama N, Ohta K (februar 1985). "Successful carnitine treatment in two siblings having lipid storage myopathy with hypertrophic cardiomyopathy". Neuropediatrics. 16 (1): 6–12. doi:10.1055/s-2008-1052536. PMID3974805.
Wu X, Prasad PD, Leibach FH, Ganapathy V (maj 1998). "cDNA sequence, transport function, and genomic organization of human OCTN2, a new member of the organic cation transporter family". Biochemical and Biophysical Research Communications. 246 (3): 589–95. doi:10.1006/bbrc.1998.8669. PMID9618255.
Nezu J, Tamai I, Oku A, Ohashi R, Yabuuchi H, Hashimoto N, Nikaido H, Sai Y, Koizumi A, Shoji Y, Takada G, Matsuishi T, Yoshino M, Kato H, Ohura T, Tsujimoto G, Hayakawa J, Shimane M, Tsuji A (januar 1999). "Primary systemic carnitine deficiency is caused by mutations in a gene encoding sodium ion-dependent carnitine transporter". Nature Genetics. 21 (1): 91–4. doi:10.1038/5030. PMID9916797. S2CID20723174.
Ohashi R, Tamai I, Inano A, Katsura M, Sai Y, Nezu J, Tsuji A (septembar 2002). "Studies on functional sites of organic cation/carnitine transporter OCTN2 (SLC22A5) using a Ser467Cys mutant protein". The Journal of Pharmacology and Experimental Therapeutics. 302 (3): 1286–94. doi:10.1124/jpet.102.036004. PMID12183691. S2CID1944987.
Rahbeeni Z, Vaz FM, Al-Hussein K, Bucknall MP, Ruiter J, Wanders RJ, Rashed MS (septembar 2002). "Identification of two novel mutations in OCTN2 from two Saudi patients with systemic carnitine deficiency". Journal of Inherited Metabolic Disease. 25 (5): 363–9. doi:10.1023/A:1020143632011. PMID12408185. S2CID25824831.
Elimrani I, Lahjouji K, Seidman E, Roy MJ, Mitchell GA, Qureshi I (maj 2003). "Expression and localization of organic cation/carnitine transporter OCTN2 in Caco-2 cells". American Journal of Physiology. Gastrointestinal and Liver Physiology. 284 (5): G863–71. doi:10.1152/ajpgi.00220.2002. PMID12684216.
Karlic H, Lohninger A, Laschan C, Lapin A, Böhmer F, Huemer M, Guthann E, Rappold E, Pfeilstöcker M (juli 2003). "Downregulation of carnitine acyltransferases and organic cation transporter OCTN2 in mononuclear cells in healthy elderly and patients with myelodysplastic syndromes". Journal of Molecular Medicine. 81 (7): 435–42. doi:10.1007/s00109-003-0447-6. PMID12802501. S2CID10992930.