Carnitine palmitoyltransferase II deficiency due to a novel gene variant in a patient with rhabdomyolysis and ARF.
Adult patients deficient in carnitine palmitoyltransferase II (CPT II) cannot generate sufficient amounts of energy, which results in rhabdomyolysis and acute renal failure (ARF). Its genetic basis has been recognized; but histopathologic changes, especially electron microscopic changes, have scarcely been described. The study subject is a patient with ARF caused by repetitive nontraumatic rhabdomyolysis. The acylcarnitine profile of serum and enzyme assay on skin fibroblasts confirmed the diagnosis of CPT II deficiency. Renal biopsy specimens were examined microscopically and immunohistochemically. The histological diagnosis was interstitial nephritis with acute tubular necrosis caused by rhabdomyolysis. Myoglobin in tubules was detected by means of immunohistochemistry and electron microscopy. The genetic structure of CPT II was analyzed in the patient and his family. Eight pairs of polymerase chain reaction (PCR) primers were designed to cover the coding region. Each PCR-amplified gene product was subjected to DNA sequencing, which unveiled heterozygosity at the CPT II locus consisting of a deletion of cytosine and thymine at codon 408, resulting in a stop signal at 420, as well as a mutation of arginine to cysteine at codon 631. The frame shift at 408 has never been described before. DNA sequencing of the family showed the deletion mutation from the mother and the point mutation from the father. We describe renopathological findings in a patient with CPT II deficiency associated with rhabdomyolysis, which suggested the pathological role of myoglobin casts in the development of tubular necrosis. Genetic analysis of the patient identified a novel variant of the CPT II gene.
Kaneoka
Hidetoshi
H
Department of Internal Medicine, Division of Nephrology and Rheumatology, Fukuoka University School of Medicine, Fukuoka, Japan. kaneokah@fukuoka-u.ac.jp
Uesugi
Noriko
N
Moriguchi
Ayaka
A
Hirose
Shinichi
S
Takayanagi
Masaki
M
Yamaguchi
Seiji
S
Shigematsu
Yosuke
Y
Yasuno
Tetsuhiko
T
Sasatomi
Yoshie
Y
Saito
Takao
T
D000328:Adult; D002334:Carnitine O-Palmitoyltransferase / Q000172:deficiency / Q000235:genetics*; D002478:Cells, Cultured / Q000201:enzymology; D003062:Codon / Q000235:genetics; D003131:Combined Modality Therapy; D005091:Exons / Q000235:genetics; D005347:Fibroblasts / Q000201:enzymology; D005440:Fluid Therapy; D016368:Frameshift Mutation; D005838:Genotype; D006440:Hemofiltration; D006801:Humans; D007683:Kidney Tubular Necrosis, Acute / Q000188:drug therapy / Q000209:etiology*; D008297:Male; D020125:Mutation, Missense; D009211:Myoglobin / Q000378:metabolism; D009395:Nephritis, Interstitial / Q000150:complications / Q000201:enzymology / Q000235:genetics*; D017354:Point Mutation; D006435:Renal Dialysis; D012206:Rhabdomyolysis / Q000150:complications / Q000201:enzymology / Q000235:genetics*; D017384:Sequence Deletion
D003062:Codon; D009211:Myoglobin; D002334:Carnitine O-Palmitoyltransferase