Escaping the cut by restriction enzymes through single-strand self-annealing of host-edited 12-bp and longer synthetic palindromes.

Abstract:

:Palindromati, the massive host-edited synthetic palindromic contamination found in GenBank, is illustrated and exemplified. Millions of contaminated sequences with portions or tandems of such portions derived from the ZAP adaptor or related linkers are shown (1) by the 12-bp sequence reported elsewhere, exon Xb, 5' CCCGAATTCGGG 3', (2) by a 22-bp related sequence 5' CTCGTGCCGAATTCGGCACGAG 3', and (3) by a longer 44-bp related sequence: 5' CTCGTGCCGAATTCGGCACGAGCTCGTGCCGAATTCGGCACGAG 3'. Possible reasons for why those long contaminating sequences continue in the databases are presented here: (1) the recognition site for the plus strand (+) is single-strand self-annealed; (2) the recognition site for the minus strand (-) is not only single-strand self-annealed but also located far away from the single-strand self-annealed plus strand, rendering impossible the formation of the active EcoRI enzyme dimer to cut on 5' G/AATTC 3', its target sequence. As a possible solution, it is suggested to rely on at least two or three independent results, such as sequences obtained by independent laboratories with the use, preferably, of independent sequencing methodologies. This information may help to develop tools for bioinformatics capable to detect/remove these contaminants and to infer why some damaged sequences which cause genetic diseases escape detection by the molecular quality control mechanism of cells and organisms, being undesirably transferred unchecked through the generations.

journal_name

DNA Cell Biol

journal_title

DNA and cell biology

authors

Castro-Chavez F

doi

10.1089/dna.2011.1339

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

151-63

issue

2

eissn

1044-5498

issn

1557-7430

journal_volume

31

pub_type

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