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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Hum+Genet
2016 ; 99
(4
): 894-902
Nephropedia Template TP
gab.com Text
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English Wikipedia
NAXE Mutations Disrupt the Cellular NAD(P)HX Repair System and Cause a Lethal
Neurometabolic Disorder of Early Childhood
#MMPMID27616477
Kremer LS
; Danhauser K
; Herebian D
; Petkovic Ramad?a D
; Piekutowska-Abramczuk D
; Seibt A
; Müller-Felber W
; Haack TB
; P?oski R
; Lohmeier K
; Schneider D
; Klee D
; Rokicki D
; Mayatepek E
; Strom TM
; Meitinger T
; Klopstock T
; Pronicka E
; Mayr JA
; Baric I
; Distelmaier F
; Prokisch H
Am J Hum Genet
2016[Oct]; 99
(4
): 894-902
PMID27616477
show ga
To safeguard the cell from the accumulation of potentially harmful metabolic
intermediates, specific repair mechanisms have evolved. APOA1BP, now renamed
NAXE, encodes an epimerase essential in the cellular metabolite repair for NADHX
and NADPHX. The enzyme catalyzes the epimerization of NAD(P)HX, thereby avoiding
the accumulation of toxic metabolites. The clinical importance of the NAD(P)HX
repair system has been unknown. Exome sequencing revealed pathogenic biallelic
mutations in NAXE in children from four families with (sub-) acute-onset ataxia,
cerebellar edema, spinal myelopathy, and skin lesions. Lactate was elevated in
cerebrospinal fluid of all affected individuals. Disease onset was during the
second year of life and clinical signs as well as episodes of deterioration were
triggered by febrile infections. Disease course was rapidly progressive, leading
to coma, global brain atrophy, and finally to death in all affected individuals.
NAXE levels were undetectable in fibroblasts from affected individuals of two
families. In these fibroblasts we measured highly elevated concentrations of the
toxic metabolite cyclic-NADHX, confirming a deficiency of the mitochondrial
NAD(P)HX repair system. Finally, NAD or nicotinic acid (vitamin B3)
supplementation might have therapeutic implications for this fatal disorder.