期刊
PEDIATRIC NEUROLOGY
卷 52, 期 6, 页码 638-641出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pediatrneurol.2015.02.023
关键词
spinal muscular atrophy; full-length SMN1; C-terminal domain; axonal-SMN
资金
- Research Committee of Spinal Muscular Atrophy [H22-NANCHI-IPPAN-012]
- Ministry of Education, Culture, Sports, Science and Technology of Japan [25461549]
- Grants-in-Aid for Scientific Research [25461549] Funding Source: KAKEN
BACKGROUND: Spinal muscular atrophy is caused by survival motor neuron gene SMN1 mutations. SMN1 produces a full-length SMN1 protein isoform encoded by exons 1-7, and an axonal-SMN protein isoform encoded by exons 1-3 and intron 3. The axonal-SMN protein is expressed only in the embryonic period and plays a significant role in axonal growth. However, there has been no report on contribution of axonal-SMN to spinal muscular atrophy severity until now. PATIENTS: Two Japanese boys with spinal muscular atrophy type 1 in our study presented with generalized muscle weakness and respiratory insufficiency soon after birth and required an artificial ventilator from early infancy. Patient 1 was compound heterozygous for two SMN1 mutations, whole-gene deletion, and an intragenic mutation (c.819_820insT). He retained one copy of SMN1 producing the N-terminal part of SMN1 including axonal-SMN. On the other hand, patient 2 was homozygous for SMN1 deletion. Both of them showed the same copy number of spinal muscular atrophy modifying genes, NAIP and SMN2. These findings suggested that the C-terminal domain of full-length SMN1 determined the severity, irrespective of presence or absence of axonal-SMN expression. CONCLUSION: In patient 1, the C-terminal domain of full-length SMN1 determined spinal muscular atrophy severity, rather than the axonal-SMN, one copy of which could be present and intact. The presence or absence of axonal-SMN may not impact disease severity in spinal muscular atrophy type 1 patients.
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