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Distribution of homozygous deletion of SMN1 and NAIP genes according to the different types of SMA.
| N of families | SMN1 gene deletion | NAIP gene deletion | ||
|---|---|---|---|---|
| Exon 7 | Exon 8 | Exons 7 and 8 | Exon 4/5 | |
| SMA I (n = 14) | 2 (14%) | 1 (7%) | 8 (57%) | 4 (28%) |
| SMA II (n = 10) | 1 (10%) | 0 | 6 (60%) | 2 (20%) |
| SMA III (n = 31) | 1 (3%) | 2 (6%) | 21 (67%) | 9 (29%) |
| SMA IV (n = 2) | 0 | 0 | 1 (50%) | 0 |
