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2015 ; 22
(ä): 11-6
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Asparagine Synthetase Deficiency: New Inborn Errors of Metabolism
#MMPMID25663424
Alfadhel M
; Alrifai MT
; Trujillano D
; Alshaalan H
; Al Othaim A
; Al Rasheed S
; Assiri H
; Alqahtani AA
; Alaamery M
; Rolfs A
; Eyaid W
JIMD Rep
2015[]; 22
(ä): 11-6
PMID25663424
show ga
BACKGROUND: Asparagine synthetase deficiency (ASD) is a newly identified
neurometabolic disorder characterized by severe congenital microcephaly, severe
global developmental delay, intractable seizure disorder, and spastic
quadriplegia. Brain MRI showed brain atrophy, delayed myelination, and simplified
gyriform pattern. METHODS: We report ASD deficiency in a 2- and 4-year-old
sibling. On them, we described clinical, biochemical, and molecular findings, and
we compared our results with previously reported cases. RESULTS: We identified a
homozygous novel missense mutation in ASNS gene in both probands and we
demonstrated low CSF and plasma asparagine in both patients. CONCLUSIONS:
Clinicians should suspect ASD deficiency in any newborn presented with severe
congenital microcephaly followed by severe epileptic encephalopathy and global
developmental delay. CSF asparagine level is low in this disorder while plasma
may be low.