SMN1 and proximal spinal muscular atrophy: In our samples, the frequency of individuals with the SMA carrier “1:2” CN was the highest 195/13426 with a percentage of (1.45) compared with other individuals with the SMA carrier “1:1” 98/13426 and “1:3” 76/13426 with a percentage of 0.73% and 0.57% respectively (Table 1).The highest frequency of SMN1 CN: SMN2 CN was seen in individuals with the “2:2” CN 6241/13426 (46.48%) followed by individuals with the “2:1” 3806/13426 (28.35%) (Table 1).