Why a single gene can have multiple locations in chromosome?
In the genbank format data of gene annotation, usually I can find genes with location like this:
[42764:>153205](-)
It means that the gene start from 42764 and end in 153205 or further.
Why gene location can not be precisely reported?
Also, if I check this gene ("ABR") in UCSC, it will give a lot of gene locations, even in the same chromosome! (see: http://goo.gl/3er7BR)
These locations differs from each other, why could a gene have multi location, even in the same chromosome?
1 answer
You need to read up on the concept of genes that have alternative splicing or multiple isoforms. Once such mechanism uses different promoters/start sites for the same gene.
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