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In recent years, a subset of these genes has been identified; however, their sequences are unusually problematic, often evading detection by standard sequencing technologies. This limitation has hindered detailed investigation of the phenomenon\u2014until recent progress in long read technologies, which are more robust against sequencing biases. This enabled us to classify real gene losses extensively, which strikingly revealed that a large number of the genes residing on so-called dot chromosomes were indeed lost during avian evolution. We demonstrate that dot microchromosomes\u2014small, repeat-dense avian chromosomes\u2014harbor widespread gene attrition, with 29% of ohnologs (duplicates from ancestral genome doublings) eliminated, far exceeding rates on other chromosomes. Moreover, we reveal that genes retained on these dot chromosomes exhibit a previously undescribed form of dynamic genetic instability. This instability, which we term sequence stuttering, is characterized by a massive expansion of short sequences within intronic regions. Intriguingly, in some cases, the expanding sequences appear to originate from neighboring exons. As a result, intron lengths vary extensively among individual chickens, suggesting that these events are evolutionarily recent. Since this phenomenon has not been reported in any other vertebrate species, our findings lay the groundwork for future research into its underlying mechanisms, evolutionary implications, and potential identification of similar loci across vertebrate genomes.<\/jats:p>","DOI":"10.1093\/gbe\/evag038","type":"journal-article","created":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T12:39:34Z","timestamp":1771072774000},"source":"Crossref","is-referenced-by-count":6,"title":["Decoding the Avian Missing Gene Mystery: Dot Chromosomes Unmask Extensive Gene Loss and Novel Genetic Instability"],"prefix":"10.1093","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0589-2568","authenticated-orcid":false,"given":"Tom\u00e1\u0161","family":"Hron","sequence":"first","affiliation":[{"name":"Institute of Molecular Genetics of the Czech Academy of Sciences , Prague 4 142 20 ,","place":["Czech 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