Table 3

Summary of sequence elements identified across studies

ElementMutations in this region
Short direct repeats  
    111GCCtgagggc ttggatgcag cagcttcctc cactGCCccg… 24, 25, 26, 27 
    141cactgccCCG agcacagcca CCGctgcagc… 25, 26, 27, 31, 32, 35, 36, 37, 38, 39*, 40*, 41*, 42*, 43, 44*, 45, 46, 47, 48, 49, 50, 51*, 52*, 53*, 54*, 55* 
    151agcaCAGCca ccgctgCAGC… 25, 26, 27, 32*, 34, 35*, 36*, 37, 38, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57*, 58*, 59 
    171tgcggcactG GCCTACtaca gggacgctga GGCCTACaga… 38*, 44, 66*, 67*, 68*, 69*, 70*, 71*, 72*, 73*, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83* 
Indel hotspots  
    Ig Switch sites: TGGGG, CCCCA, GGGGT 6, 11, 12, 13, 15, 16, 17, 18, 19, 20 
    Pol α Hotspot: 41cccTCCCCCa… 11, 12, 13 
    Fragile X Hotspot: 141cactgccCCG…agcacagcca CCGctgcagc… (note: this hotspot is also a short direct repeat). 25, 26, 27, 31, 32, 35, 36, 37, 38, 39*, 40*, 41*, 42*, 43, 44*, 45, 46, 47, 48, 49, 50, 51*, 52*, 53*, 54*, 55* 
Mononucleotide repeats  
    9CCC 
    18GGGgtCCCtGGGG 2, 7 
    40CCCCtCCCCC 10, 11, 12, 13 
    91GGGG 15, 16, 17, 18, 19, 20 
    95TTTTcTT 21 
    102CCCC 22, 23 
    117GGG 28 
    137CCtCC 33 
    146CCCC 37, 38, 39, 40, 41 
    191GGG 80, 81, 82 
    215CCCC 83 
ElementMutations in this region
Short direct repeats  
    111GCCtgagggc ttggatgcag cagcttcctc cactGCCccg… 24, 25, 26, 27 
    141cactgccCCG agcacagcca CCGctgcagc… 25, 26, 27, 31, 32, 35, 36, 37, 38, 39*, 40*, 41*, 42*, 43, 44*, 45, 46, 47, 48, 49, 50, 51*, 52*, 53*, 54*, 55* 
    151agcaCAGCca ccgctgCAGC… 25, 26, 27, 32*, 34, 35*, 36*, 37, 38, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57*, 58*, 59 
    171tgcggcactG GCCTACtaca gggacgctga GGCCTACaga… 38*, 44, 66*, 67*, 68*, 69*, 70*, 71*, 72*, 73*, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83* 
Indel hotspots  
    Ig Switch sites: TGGGG, CCCCA, GGGGT 6, 11, 12, 13, 15, 16, 17, 18, 19, 20 
    Pol α Hotspot: 41cccTCCCCCa… 11, 12, 13 
    Fragile X Hotspot: 141cactgccCCG…agcacagcca CCGctgcagc… (note: this hotspot is also a short direct repeat). 25, 26, 27, 31, 32, 35, 36, 37, 38, 39*, 40*, 41*, 42*, 43, 44*, 45, 46, 47, 48, 49, 50, 51*, 52*, 53*, 54*, 55* 
Mononucleotide repeats  
    9CCC 
    18GGGgtCCCtGGGG 2, 7 
    40CCCCtCCCCC 10, 11, 12, 13 
    91GGGG 15, 16, 17, 18, 19, 20 
    95TTTTcTT 21 
    102CCCC 22, 23 
    117GGG 28 
    137CCtCC 33 
    146CCCC 37, 38, 39, 40, 41 
    191GGG 80, 81, 82 
    215CCCC 83 

Mutations are depicted in columns to the left, with critical sequences indicated in bold. For ease of comparison, sequences are represented in the same 10-base blocks as shown in Figure 2, with a superscript indicating the location within exon 2. In the right column, the mutations presented and enumerated in Table 3 are indicated.

*

Mutations that interrupt at least one of the direct repeats.

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