Closing the gaps on human chromosome 19 revealed genes with a high density of repetitive tandemly arrayed elements.

Abstract:

:The reported human genome sequence includes about 400 gaps of unknown sequence that were not found in the bacterial artificial chromosome (BAC) and cosmid libraries used for sequencing of the genome. These missing sequences correspond to approximately 1% of euchromatic regions of the human genome. Gap filling is a laborious process because it relies on analysis of random clones of numerous genomic BAC or cosmid libraries. In this work we demonstrate that closing the gaps can be accelerated by a selective recombinational capture of missing chromosomal segments in yeast. The use of both methodologies allowed us to close the four remaining gaps on the human chromosome 19. Analysis of the gap sequences revealed that they contain several abnormalities that could result in instability of the sequences in microbe hosts, including large blocks of micro- and minisatellites and a high density of Alu repeats. Sequencing of the gap regions, in both BAC and YAC forms, allowed us to generate a complete sequence of four genes, including the neuronal cell signaling gene SCK1/SLI. The SCK1/SLI gene contains a record number of minisatellites, most of which are polymorphic and transmitted through meiosis following a Mendelian inheritance. In conclusion, the use of the alternative recombinational cloning system in yeast may greatly accelerate work on closing the remaining gaps in the human genome (as well as in other complex genomes) to achieve the goal of annotation of all human genes.

journal_name

Genome Res

journal_title

Genome research

authors

Leem SH,Kouprina N,Grimwood J,Kim JH,Mullokandov M,Yoon YH,Chae JY,Morgan J,Lucas S,Richardson P,Detter C,Glavina T,Rubin E,Barrett JC,Larionov V

doi

10.1101/gr.1929904

subject

Has Abstract

pub_date

2004-02-01 00:00:00

pages

239-46

issue

2

eissn

1088-9051

issn

1549-5469

pii

1929904

journal_volume

14

pub_type

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