Table 1

Possible expression states of allele sets in diploid genome


Expression states





Non-ASE
ASEi/xi
ASEΔ




Allele
1
2
3
4
5

A
On
Off
On
Off
Δ
a
On
Off
Off
On
Δ

Expression states 1 and 2 refer to alleles that do not display allele-specific expression (ASE). Expression states 3 and 4 refer to alleles that do display ASE, for example, due to imprinting (ASEi) and X-inactivation (ASExi). Expression state 5 refers to alleles that display differential ASE (ASEΔ), due to currently unknown mechanism(s).

Bell and Beck Genome Medicine 2009 1:56   doi:10.1186/gm56