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The Mu genome has an insertion of one amino acid at position 144/145 of the spike protein, giving a total mutation YY144-145TSN. That mutation is conventionally notated as Y144S Y145N because insertions would break a lot of comparison tools. It also features a frame-shift deletion of 4 nucleotides in ORF3a that generates a stop codon two amino acids later, the mutation is notated as V256I N257Q P258*[1]. The list of defining mutations is: S: T95I, Y144S, Y145N, R346K, E484K or the escape mutation, N501Y, D614G, P681H, and D950N; ORF1a: T1055A, T1538I, T3255I, Q3729R; ORF1b: P314L, P1342S; N: T205I, ORF3a: Q57H, V256I, N257Q, P258*; ORF8: T11K, P38S, S67F[1]
The quoted reference is a first class report on the Mu variant by top virologist Emma Hodcroft and collaborators. It quotes the original reference. The list of mutations as given in the Wikipedia article is not accurate. 134.96.90.2 (talk) 13:51, 15 September 2021 (UTC)[reply]
Yes, I think this information is accurate and the reference is reliable. The off-frame nature of the ORF3a deletion is actually beyond genomics relevant because it caused a delay in the admission of B.1.621 sequences to GISAID---frame shift mutations are rejected by a quality check of GISAID and need further confirmation.2003:E6:970F:F9B4:298A:1735:B967:B88D (talk) 14:03, 16 September 2021 (UTC)[reply]
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