Result: The following substitutions appeared to be linked to the genotype (although not all the isolates of a determined genotype necessarily showed the mutation): G to A 1721 (found in genotype F), G to A 1757 (D), C to T 1802 (F), G to T 1803 (F), A to T 1850 (D and F), and C to T 1858 (D and F).
Hepatitis B virus infection: precore mutants and its relation to viral genotypes and core mutations.
Abstract: In genotype A, the M1 mutation coexisted with a second mutation (C-->T at position 1858 in codon 15), and both mutations were paired in the secondary structure of the RNA encapsidation signal, which justified the rare presence of precore mutants in this genotype.
HBV mutation literature information.
PMID: 
2001
BMC microbiology
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