25. Carnitine-acylcarnitine translocase deficiency (CACT) 26. Carnitine palmitoyltransferase deficiency type 2 (CPT2) 27. Guanidinoacetate methyltransferase deficiency (GAMT) 28. Methyl-acetoacetyl-CoA thiolase deficiency, ketothiolase deficiency (BKT) 29. Mucopolysaccharidosis type 1 (MPS I) 30. Organic cation transporter 2 deficiency (OCTN 2) 31. Spinal muscular atrophy (SMA)a 32. X-linked adrenoleukodystrophy (ALD). The gene discussed is SLC22A2; the disease is proximal spinal muscular atrophy.