A spontaneous mutation results in a C-to-A point mutation in the first base of intron 12. This eliminates the exon 12 splice donor site by changing it from G-GT to G-TT.
Legend:
cx: complex: > 1 genome feature ot: other: hemizygous, indeterminate,... (F): Female
(M): Male
N: normal phenotype
(#): related diseases count