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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: Am J Intellect Dev Disabil. 2020 Nov 1;125(6):493–509. doi: 10.1352/1944-7558-125.6.493

Table 2.

Participant Mutation Type

All (n = 1075) Development Sample (n = 713) Validation Sample (n = 362)
Common Point Mutations
 R106W 3% 3% 4%
 R133C 6% 6% 5%
 T158M 10% 10% 10%
 R168X 11% 11% 9%
 R255X 9% 10% 9%
 R270X 6% 5% 6%
 R294X 6% 6% 6%
 R306C 8% 9% 8%
Other Point Mutations 6% 6% 6%
C-terminal Truncations 10% 10% 11%
Early Truncating 9% 9% 7%
Large Deletion 9% 8% 10%
Exon1 1% 1% 2%
Splice Site 1% 1% 1%
None 2% 2% 3%
Missing 3% 2% 3%