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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]