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Supplemental Figure 4. Gene-specific FMR1 PCR Enables Detection of Low Abundance Expanded Alleles. A) FMR1 Southern blot data for 5 clinical specimens. The threshold for full mutation (FM, >200 CGG) unmethylated and methylated alleles is designated by the black dotted line. Note that the expanded alleles represented in samples #118 and #125 were very faint, but these were identified as full mutations. B) Corresponding FMR1 PCR data, as visualized by AGE. The threshold for a full mutation (FM) is indicated by the white dotted line. C) Corresponding FMR1 PCR data, as visualized by CE. The threshold for a full mutation (FM) is marked with the black vertical line. To facilitate data interpretation, the Y-axis scale was set to best suit the allele representations for each specimen: #22 (150 RFU), #101 (200 RFU), #63 (1000 RFU), #118 (1100 RFU), and #125 (1100 RFU). Note that the full mutations in #118 and #125 are readily discerned. The same gDNA sample was used for all three evaluations (Southern blot, PCR/AGE, and PCR/CE).
Fm, Full Mutation Mosaic
#22 #101 #63 #118 #125
Sou
ther
n B
lot
Dat
aP
CR
/AG
E D
ata
Southern PM PM FM FM FMCall
PCR Call Fm Fm Fm Fm Fm
PCR/CE Data
#22
#101
#63
#118
#125
Normal Premutation Full Mutation Int
FMMe
FMUnMe
FM
A C
B