Lu L, Jia H, Dröge P, Li J. The human genome-wide distribution of DNA palindromes.
Funct Integr Genomics 2007;
7:221-7. [PMID:
17340149 DOI:
10.1007/s10142-007-0047-6]
[Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2006] [Revised: 02/05/2007] [Accepted: 02/19/2007] [Indexed: 10/23/2022]
Abstract
In this work, we performed a systematic study of perfect and nonspacer palindromes present in human genomic DNA, and we investigated palindrome distribution over the entire human genome and over the functional regions such as the exon, intron, intergenic, and upstream regions (2,000 bp upstream from translational start site). We found that 24 palindrome-abundant intervals are mostly located on G-bands, which condense early, replicate late, and are relatively A+T rich. In general, palindromes are overrepresented in introns but underrepresented in exons. Upstream region has enriched palindrome distribution, where palindromes can serve as transcription factor binding sites. We created a Human DNA Palindrome Database (HPALDB) which is accessible at http://vhp.ntu.edu.sg/hpaldb . It contains 12,556,994 entries covering all palindromes in the human genome longer than 6 bp. Queries can be performed in different ways. Each entry in the database is linked to its location on NCBI's human chromosome Map Viewer.
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