Fig. 1

Paternal premutation allele inheritance (PIP) with low expansion (CGG repeat expansion 88 90). The figure shows the examination of the family No.10 (code 367). The patient inherited the normal 29 CGG repeat number allele from the mother. The other allele was inherited from the father, where the paternal 88 CGG repeat number expanded to 90 was observed in the patient. There was no evidence of AGG interruptions in the father. The two AGG interruptions are in accordance with the maternal allele