has_sequence_attribute novel replicon Novel replicons are considered as an 'insertion' in a genome, and as such, qualify as types of sequence_alterations and variant alleles. There is no pre-existing locus that it modifies, however, and thus it is not really an 'allele of' a named locus. But conceptually, we still consider these to represent genetic variants and classify them as variant alleles. A genomic feature that represents an entirely new replicon in the genome, e.g. an extrachromosomal replicon or an extra copy of a chromosome. This class is defined so as to support classification of things like novel extrachromosomal replicons and aneusomic chromosomes as being variant alleles in a genome. These represent entirely new features in the genome - not variants of an existing feature. novel sequence_alteration exploratory term