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. Author manuscript; available in PMC: 2010 Feb 10.
Published in final edited form as: Trends Genet. 2008 Jul;24(7):336. doi: 10.1016/j.tig.2008.04.007

Table 1. Tests for faster X evolution in Drosophila.

Species Number of Genes Analysis Result References
D. melanogaster - D. simulansa 254 genes dNb and dN/dSc X ≈ A [30]
D. melanogaster 1,841 duplicate genes dN/dS X > A [38]
D. melanogaster 13 duplicate genes MKd X > A [39]
D. pseudoobscura - D. melanogaster 9,184 genes dN X ≈ A [35]
D. pseudoobscura - D. melanogaster 8,453 genes dN X > A [33]
D. pseudoobscura - D. melanogaster 110 genes dN/dS XR > 3Le [32]
D. pseudoobscura - D. melanogaster 2,646 genes dN/dS XR ≈ 3L [37]
D. melanogaster lineage 98 genes MK X ≈ A [34]
D. melanogaster lineage 337 genes MK X ≈ A [31]
D. melanogaster - D. simulans 50 genes with male-biased expression MK X > A [28]
D. melanogaster - D. simulans 41 genes with female-biased expression MK X ≈ A [28]
D. melanogaster - D. simulans 45 genes with no sex-biased expression MK X ≈ A [28]
D. melanogaster - D. simulans and D. melanogaster-D. yakuba 597 genes with male-biased expression dN/dS X > A [28]
D. melanogaster - D. simulans and D. melanogaster-D. yakuba 645 genes with female-biased expression dN/dS X ≈ A [28]
D. melanogaster - D. simulans and D. melanogaster-D. yakuba 3,254 genes with no sex-biased expression dN/dS X > A [28]
D. simulans, D. melanogaster and D. yakuba lineages genome-wide, 50 kb windows divergence at all sitesf X > A [29]
D. melanogaster, D. sechellia, D. erecta, D. ananassae, D. pseudoobscura, D. willistoni, D. mojavensis, D. virilis, and D. grimshawi lineages 6,698 genes amino acid divergence X ≈ A [36]
D. persimilis lineage 6,698 genes amino acid divergence X > A [36]
D. yakuba and D. simulans lineages 6,698 genes amino acid divergence A > X [36]
D. melanogaster, D. sechellia, D. simulans, D. yakuba and D. erecta 8,510 genes dN/dS X ≈ A [36]
D. sechellia and D. simulans lineages 8,510 genes dN/dS X > A [36]
D. melanogaster-D. simulans (3L) vs. D. pseudoobscura-D. persimilis (XR) 2,392 dN/dS XR > 3L [36]
a

Molecular divergence can be estimated between two species (e.g., D. melanogaster - D. simulans) or along a single lineage (e.g., D. melanogaster).

b

dN = number of nonsynonymous differences per nonsynonymous site.

c

dN/dS = nonsynonymous differences per nonsynonymous site standardized by synonymous (neutral) differences per synonymous sites.

d

The McDonald-Kreitman (MK) test contrasts the numbers of replacement and synonymous fixed differences with the numbers of replacement and synonymous polymorphisms.

e

Orthologous genes that are X-linked (XR) in D. pseudoobscura and close relatives but autosomal (3L) in D. melanogaster.

f

For dS, X ≈ A in the D. simulans lineage.