Table 1.
Number of Malpighian tubule orthologues and non-orthologues expressed in the pea aphid gut. Data are presented for functional groups in figure 2.
| functional group (no. of genes in pea aphid genome) | no. genes expressed in gut/total number of genes (proportion) |
|
|---|---|---|
| Malpighian tubule orthologues | non-orthologues | |
| neurotransmitter secretion (67)a | 1/3 (0.33) | 22/64 (0.34) |
| amino acid transport (131)a | 2/4 (0.50) | 40/127 (0.32) |
| anion transport (132)a | 0/1 (0) | 61/131 (0.47) |
| carbohydrate transport (217)a | 2/4 (0.50) | 84/213 (0.39) |
| extracellular transport (180)a | 2/5 (0.40) | 96/175 (0.55) |
| cation transport (436)a | 5/7 (0.71) | 180/429 (0.42) |
| phosphate ion transport (158)a | 4/6 (0.67) | 59/152 (0.39) |
| phosphate-containing compound metabolic process (401)b | 7/8 (0.88) | 218/393 (0.55) |
| carbohydrate metabolic process (846)b | 11/15 (0.73) | 345/831 (0.42) |
| cellular amino acid biosynthesis process (145)c | 7/7 (1) | 68/138 (0.49) |
| cellular amino acid catabolic process (66)c | 6/6 (1) | 32/60 (0.53) |
| coenzyme metabolic process (99)c | 6/6 (1) | 63/93 (0.68) |
| fatty acid metabolic process (157)c | 7/7 (1) | 80/150 (0.53) |
| nitrogen compound metabolic process (206)c | 8/9 (0.89) | 122/197 (0.62) |
| vitamin biosynthetic process (41)c | 2/3 (0.67) | 18/38 (0.47) |
| t = 2.66, p = 0.009d | ||
aOver-represented in Malpighian tubule gene set of Drosophila, relative to Drosophila genome.
bOver-represented in Malpighian tubule gene set of Drosophila and Malpighian tubule orthologue set of pea aphid, relative to respective genomes.
cOver-represented in Malpighian tubule orthologue gene set of pea aphid, relative to pea aphid genome.
dPaired t-test comparison of proportion of Malpighian tubule orthologues and non-orthologues, after asin-square-root transformation to obtain normal distributions (Anderson Darling test).