Molecular evidence for increased regulatory conservation during metamorphosis, and against deleterious cascading effects of hybrid breakdown in Drosophila

Table 1 Number of genes classified into categories based on their patterns of expression in hybrids relative to the parental species.

		Stage
Pattern	Larval	E. pupal	L. pupal	Adult
Not differentially expressed	1216	1455	1479	1203
Intermediate expression	0	9	24	8
Drosphila simulans dominance	60	13	24	146
D. sechellia dominance	27	146	174	83
Underexpressed	206	76	14	149
Overexpressed	97	23	10	53
Other	446	330	327	410

E pupal, early pupal; L pupal, late pupal.
Patterns are as follows: not differentially expressed, not significantly differentially expressed in any pairwise comparison among parental species or hybrids; intermediate expression, expressed at an intermediate level between parental expression levels; Drosphila simulans dominance, significantly differentially expressed between parental species and for which hybrids are only significantly different in expression level from D. sechellia; D. sechellia dominance, opposite of previous pattern; Underexpressed, genes that are significantly underexpressed in the hybrids relative to both parents; Overexpressed, genes that are significantly overexpressed in the hybrids relative to both parents; Other, genes whose expression patterns did not fit into any of the above classes.

ISSN: 1741-7007