Schema for LTRharvest - LTR Fragments Identified by LTRharvest

Database: DsimGB2 Primary Table: ltrdigest_retrotransposon Row Count: 174 Data last updated: 2022-10-20

field	example	SQL type	info
`bin`	593	`smallint(5) unsigned`	range
`chrom`	CM002910	`varchar(255)`	values
`chromStart`	1123753	`int(10) unsigned`	range
`chromEnd`	1128799	`int(10) unsigned`	range
`name`	LTR_retrotransposon1	`varchar(255)`	values
`score`	1000	`int(10) unsigned`	range
`strand`	+	`char(1)`	values

Sample Rows

bin	chrom	chromStart	chromEnd	name	score	strand
593	CM002910	1123753	1128799	LTR_retrotransposon1	1000	+
719	CM002910	17569360	17576259	LTR_retrotransposon2	1000	-
744	CM002910	20933134	20937434	LTR_retrotransposon3	1000	+
748	CM002910	21394203	21398435	LTR_retrotransposon4	1000	-
748	CM002910	21471442	21478173	LTR_retrotransposon5	1000	+
749	CM002910	21507800	21511744	LTR_retrotransposon6	1000	-
749	CM002910	21545983	21557564	LTR_retrotransposon7	1000	+
93	CM002910	21621636	21629082	LTR_retrotransposon8	1000	-
750	CM002910	21646178	21652950	LTR_retrotransposon9	1000	-
751	CM002910	21781632	21785734	LTR_retrotransposon10	1000	-

Note: all start coordinates in our database are 0-based, not 1-based. See explanation here.

LTRharvest (ltrdigest) Track Description


	Description LTRharvest is used to identify putative long terminal repeats (LTR) retrotransposons in the D. simulans genome using the following parameters: `-seed 76 -minlenltr 116 -maxlenltr 800 -mindistltr 2280 -maxdistltr 8773 -similar 91 -xdrop 7 -mat 2 -mis -2 -ins -3 -del -3 -mintsd 4 -maxtsd 20 -vic 60 -overlaps best` Additional features within the LTR retrotransposons are annotated by LTRdigest with the following parameters: `-pptradius 30 -pptlen 8 30 -pptrprob 0.97 -uboxlen 3 30 -pptuprob 0.91 -pbsradius 30 -pbsalilen 11 30 -pbsoffset 0 5 -pbstrnaoffset 0 40 -pbsmaxedist 1 -pbsmatchscore 5 -pbsmismatchscore -10 -pbsinsertionscore -20 -pbsdeletionscore -20 -pdomevalcutoff 1e-6 -maxgaplen 50` The subset of candidates that show significant similarity to Pfam protein domains within LTR retrotransposons are selected and then clustered using the ltrclustering program with the following parameters: `-psmall 80 -plarge 30` References Ellinghaus D, Kurtz S, and Willhoeft U. LTRharvest, an efficient and flexible software for de novo detection of LTR retrotransposons. BMC Bioinformatics, 9:18, 2008. Steinbiss S, Willhoeft U, Gremme G, and Kurtz S. Fine-grained annotation and classification of de novo predicted LTR retrotransposons. Nucleic Acids Research, 37(21):7002-7013 (2009). Steinbiss S, Kastens S, and Kurtz S. LTRsift: a graphical user interface for semi-automatic classification and postprocessing of de novo detected LTR retrotransposons. Mob DNA. 2012 Nov 7;3(1):18.

Description

References