Table 2

Comparison of neo-sex chromosomes with other chromosomes

Chromosome

chrX (Muller A)

neo-sex (Muller C + D)

chr2 (Muller B + E)

chr4 (Muller F)


exonic SNP density *(♂/♀)

2.04/1.01(2.02)

4.61/0.97(4.75)

4.35/3.33(1.30)

0.18/0.01(18)


intronic SNPs density *(♂/♀)

2.58/0.77(3.35)

5.57/0.86(6.47)

5.84/2.75(2.12)

0.99/0.03(33)


putative pseudogenes No./total#

11/2055

80/4751

54/5056

1/87


Ka average (× 103)§

1.03/0.42

2.02/0.58

1.89/1.26

0.73/0.16


Ka sd. (× 103)

9.48/4.56

19.56/6.82

18.11/14.3

29.13/10.87


Tandem Duplications (%)||

13.8/5.6

20.7/5.5

15.3/3.79

14.9/5.8


* SNP density (sites/kb) was calculated using exon or intron regions of scaffolds mapping to the respective chromosomes, and shown as SNP density in male/SNP density in female, and their ratio in parentheses.

# Male-specific putative pseudogenes were identified by premature stop codons, frameshifts or mutations at start codons. Shown are the pseudogene number/total mapped genes on each chromosome.

§ Shown are nonsynonymous substitutions calculated in male/female. Sd.: standard deviation.

|| Shown are proportions of tandem duplications among all the SV events for each chromosome identified in male/female.

Due to the low number of genes on chr4, inferences on this chromosome may be strongly affected by sampling effects.

Zhou et al. BMC Genomics 2012 13:109   doi:10.1186/1471-2164-13-109

Open Data