Repeat region absent in mitochondrial genome of tube-dwelling diatom Berkeleya fennica (Naviculales, Bacillariophyceae)

Abstract

The complete mitochondrial DNA of tube-dwelling diatom, Berkeleya fennica was sequenced and characterized. The circular mitogenome contains 63 genes in 35,509 bp (29.7% GC), including 36 protein-coding, 25 tRNA, 2 rRNA genes. Most of the protein-coding (27) genes have usual ATG start codon, except 9 genes such as ATA for rps8 ATC for rps14 ATT for rps12 and orf51 GTG for nad5 TTA for cox3, nad4 and orf147 and TTG for cob. The nad11 and rrs are the only interrupted genes in the mitogenome. Gene content and synteny of B. fennica are very similar to Phaeodactylum tricoruntum (NC_016739). Absence of repeat region in B. fennica resulted in mitogenome size difference to P. tricoruntum. A new mitogenome will provide useful information for mitochondrial genome diversity and evolution of the diatoms.otein-coding (27) genes have usual ATG start codon, except 9 genes such as ATA for rps8 ATC for rps14 ATT for rps12 and orf51 GTG for nad5 TTA for cox3, nad4 and orf147 and TTG for cob. The nad11 and rrs are the only interrupted genes in the mitogenome. Gene content and synteny of B. fennica are very similar to Phaeodactylum tricoruntum (NC_016739). Absence of repeat region in B. fennica resulted in mitogenome size difference to P. tricoruntum. A new mitogenome will provide useful information for mitochondrial genome diversity and evolution of the diatoms.