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Table 3 Cox2 gene length variability in freshwater mussels

From: Variability of mitochondrial ORFans hints at possible differences in the system of doubly uniparental inheritance of mitochondria among families of freshwater mussels (Bivalvia: Unionida)

Family mtDNA Number of cox2 analyzed Length (bp)
transmitted by total number minimum maximum mean SD
Iridinidae eggs 2 2 681 681 681.0 0.0
Mulleriidae eggs 5 4 681 681 681.0 0.0
Hyriidae eggs 5 5 681 693 683.4 4.8
sperm 2 2 1329 1380 1354.5 25.5
Margaritiferidae eggs 7 7 600 693 672.4 29.9
sperm 3 3 1215 1224 1218.0 4.2
Unionidae eggs 21 21 681 684 681.1 0.6
sperm 17 17 825 1272 1193.2 130.8
  1. Range, mean, and standard deviation (SD) of the cox2 gene length in egg- and sperm-transmitted mtDNAs in different freshwater mussel families. Sperm-transmitted mtDNAs are present only in families showing DUI. Uniparental transmission of mtDNA through female gametes is assumed in Iridinidae and Mulleriidae, which do not show DUI. In Mulleriidae, the partially sequenced cox2 gene from Anodontites trapesialis was excluded from this analysis; however, it does not show the typical 3′ elongation of M cox2 genes [5]