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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)

FamilymtDNANumber of cox2 analyzedLength (bp)
transmitted bytotal numberminimummaximummeanSD
Iridinidaeeggs22681681681.00.0
Mulleriidaeeggs54681681681.00.0
Hyriidaeeggs55681693683.44.8
sperm22132913801354.525.5
Margaritiferidaeeggs77600693672.429.9
sperm33121512241218.04.2
Unionidaeeggs2121681684681.10.6
sperm171782512721193.2130.8
  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]