isCircularseqinfogr

isCircularseqinfogr is a boolean predicate used in bioinformatics software to determine whether a given sequence information graph represents a circular sequence. The term refers to a function or method that examines the topology and metadata of a sequence information graph (seqinfogr) and returns true if the graph encodes a circular genome or plasmid, and false if the sequence is linear.

In practice, isCircularseqinfogr is employed in genome assembly, annotation, and visualization workflows to differentiate circular from linear sequences. Circular sequences are common in bacteria, plasmids, mitochondria, and chloroplasts, and correctly identifying circularity informs downstream processing such as contig joining, alignment, and plotting. The function can rely on multiple signals, including explicit circularity flags in the data, edges that connect the end of a sequence to its start, or graph-based evidence of a closed loop.

Input data for isCircularseqinfogr typically comes from sequence information graphs derived from formats such as FASTA with topology metadata, GenBank records, or graph representations like GFA. The output is a simple boolean value, though implementations may also provide supporting details such as the detected circular edge or the evidence used for the decision.

See also: circular DNA, plasmids, bacterial chromosomes, mitochondria, sequence graphs, circular genome assembly. While the exact behavior of isCircularseqinfogr can vary by software, its core purpose remains the identification of circular topology within sequence representations.