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+[[!meta title="Annelid comparative genomics and the evolution of massive lineage-specific genome rearrangement in bilaterians"]]
+[[!tag bioRxiv synteny]]
+
+Thomas D. Lewin, Isabel Jiah-Yih Liao, Yi-Jyun Luo
+
+bioRxiv 2024.05.15.594353 doi:10.1101/2024.05.15.594353
+
+Annelid comparative genomics and the evolution of massive lineage-specific genome rearrangement in bilaterians
+
+[[!doi 10.1101/2024.05.15.594353 desc="“the last annelid common ancestor retained the ancestral lophotrochozoan karyotype with 20 chromosomes“  “The genomes of all sampled species have at least three ALG fusions compared to the ancestral annelid genome.”  “almost all the chromosome fusion events in annelids can be categorized as fusion-with-mixing”  “we found no correlation between the ALG fusion rate and the length of chromosomes”  “In contrast to fusions, the splitting of ALGs is relatively rare, with only three cases in this dataset of 16 annelid species.”  “in both leeches and earthworms, there is complete shuffling of the ancient bilaterian genome [...] there has also been massive genome shuffling between these two groups.“  “within the Clitellata, M. vulgaris has a lineage-specific tetraploidization that is not shared by other earthworms or leeches”  “we developed a macrosynteny rearrangement index [...] to quantify both ALG fusion and fission into a single value between 0 (no rearrangement) and 1 (maximum rearrangement).”  “dramatic genome rearrangement in clitellates correlates with the evolution of a new ecological niche, alongside divergent genomic location and altered expression of key developmental genes”"]]

diff --git a/tags/synteny.mdwn b/tags/synteny.mdwn
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@@ -88,6 +88,11 @@ can be observed in fungi even when ITS sequences are 100% identical.
  - The ancestral bilaterian had 24 linkage groups according to [[Simakov and
    coll., 2022|biblio/35108053]].
 
+ - The ancestral annelid had 20 chromosomes, syntenic to the ancestral
+   bilaterian linkage groups, but the genome of leeches and earthworms was
+   extensively reshuffled ([[Lewin, Liao and Luo,
+   2024|biblio/10.1101_2024.05.15.594353]]).
+
  - The Eleutherozoa Linkage Groups descend from a single fusion of ancestral
    bilaterian linkages B2 and C2 ([[Parey and coll., 2023|biblio/10.1101_2023.10.30.564762]]).
    Some clades there scrambled a lot, and some not (sea cucumbers).