From: Genetic approaches to understanding the causes of stuttering
 | Mutation | Amino acid change | Number of mutation carriers | |||
---|---|---|---|---|---|---|
Pakistani stutterers (N = 123) | Pakistani controls (N = 96) | North American stutterers (N = 316) | North American controls (N = 276) | |||
GNPTAB | ||||||
  Exon9 | c.961A > G | p.Ser321Gly | 1 | 0 | 0 | 0 |
  Exon11 | c.1363 G > T | p.Ala455Ser | 0 | 0 | 2 | 0 |
  Exon13 | c.1875 C > G | p.Phe624Leu | 1 | 0 | 0 | 0 |
  Exon19 | c.3598 G > A | p.Glu1200Lys | 7 | 1 | 2 | 0 |
GNPTG | ||||||
  Exon1 | c.11_19dup | p.Leu 5_Arg7dup | 0 | 0 | 1 | 0 |
  Exon2 | c.74 C > A | p.Ala25Glu | 0 | 0 | 2 | 0 |
  Exon9 | c.688 C > G | p.Leu230Val | 0 | 0 | 1 | 0 |
NAGPA | ||||||
  Exon2 | c.252 C > G | p.His84Gln | 0 | 0 | 2 | 0 |
  Exon6 | c.982 C > T | p.Arg328Cys | 0 | 0 | 5 | 0 |
  Exon10 | c.1538_1553del | p.Phe513SerfsX113 | 0 | 0 | 1 | 0 |