Human Genome · QuaDB Pipeline

Catalogue of Putative Quadruplex Sequences
across the Human Genome

Homo sapiens · GRCh38 · 20,084 genes scanned · QuadB Pipeline

A genome-wide resource of Putative G-Quadruplex forming Sequences (PGS) and Putative i-Motif forming Sequences (PIS) detected across all annotated human protein-coding genes. Motif positions, sequences, and regional breakdown across promoter (−1 kb), gene body, and 3′ downstream regions are provided for every gene.

⬡  Built 29 April 2026  ·  243,965 total motifs  ·  QuaDB v1.0
20,084
Genes Scanned
122,041
Total PGS Motifs
121,924
Total PIS Motifs
16,539
Genes with PGS
16,429
Genes with PIS
243,965
Total Motif Records
Overview

Genome-wide Distribution

PGS & PIS distribution across chromosomes and genomic regions
⬡  PGS Motifs per Chromosome
◈  Motifs by Genomic Region
PGS
Promoter 7,800
Gene Body 110,787
Downstream 3,454
PIS
Promoter 8,111
Gene Body 110,808
Downstream 3,005
⬡  Top 20 Genes by PGS Count
#GeneEnsembl IDChrPGS TotalPromoterBodyDownstream
#1 PTPRN2 ENSG00000155093 7
286
5 281 0
#2 GSE1 ENSG00000131149 16
185
2 183 0
#3 SORCS2 ENSG00000184985 4
162
1 161 0
#4 RBFOX3 ENSG00000167281 17
159
1 157 1
#5 DLGAP2 ENSG00000198010 8
152
0 152 0
#6 GALNT9 ENSG00000182870 12
138
0 138 0
#7 CAMTA1 ENSG00000171735 1
135
3 132 0
#8 RBFOX1 ENSG00000078328 16
133
0 133 0
#9 SHANK2 ENSG00000162105 11
123
1 122 0
#10 PRDM16 ENSG00000142611 1
115
4 111 0
#11 KCNQ1 ENSG00000053918 11
114
1 113 0
#12 CDH4 ENSG00000179242 20
107
1 106 0
#13 GRID1 ENSG00000182771 10
106
2 104 0
#14 NCOR2 ENSG00000196498 12
106
0 106 0
#15 COL5A1 ENSG00000130635 9
100
1 99 0
#16 VAV2 ENSG00000160293 9
99
1 97 1
#17 TNS1 ENSG00000079308 2
98
0 98 0
#18 DIP2C ENSG00000151240 10
96
1 95 0
#19 CDH23 ENSG00000107736 10
96
4 92 0
#20 RXRA ENSG00000186350 9
94
0 94 0
◈  Top 20 Genes by PIS Count
#GeneEnsembl IDChrPIS TotalPromoterBodyDownstream
#1 RBFOX3 ENSG00000167281 17
188
0 188 0
#2 SORCS2 ENSG00000184985 4
186
2 184 0
#3 GSE1 ENSG00000131149 16
182
2 180 0
#4 RBFOX1 ENSG00000078328 16
172
0 172 0
#5 PRDM16 ENSG00000142611 1
169
0 169 0
#6 PTPRN2 ENSG00000155093 7
167
2 165 0
#7 CDH4 ENSG00000179242 20
150
0 150 0
#8 DLGAP2 ENSG00000198010 8
142
1 141 0
#9 DHRSX ENSG00000292338 Y
134
0 134 0
#10 DHRSX ENSG00000169084 X
134
0 134 0
#11 CDH23 ENSG00000107736 10
131
1 129 1
#12 CAMTA1 ENSG00000171735 1
128
0 128 0
#13 SHANK2 ENSG00000162105 11
120
0 120 0
#14 KAZN ENSG00000189337 1
114
0 114 0
#15 NKD2 ENSG00000145506 5
113
0 113 0
#16 DIP2C ENSG00000151240 10
108
3 105 0
#17 CELF4 ENSG00000101489 18
108
0 108 0
#18 KCNQ1 ENSG00000053918 11
108
2 104 2
#19 FBRSL1 ENSG00000112787 12
100
0 98 2
#20 TAFA5 ENSG00000219438 22
94
0 94 0
Full Database

All Human Genes

SEARCH · SORT · FILTER · CLICK ANY GENE FOR SEQUENCE-LEVEL DETAIL
Ensembl ID Symbol Description Chr Strand Gene Start Gene End PGS Total PGS Prom. PGS Body PGS Down. PIS Total PIS Prom. PIS Body PIS Down. PGS Motifs PIS Motifs