No supergene despite social polymorphism in the big-headed ant Pheidole pallidula

No supergene despite social polymorphism in the big-headed ant Pheidole pallidula
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尽管大头蚁 Pheidole pallidula 存在社会多态性,但没有超基因

DOI:
10.1101/2022.12.06.519286
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Favreau E
Favreau E
中科院分区:
--
文献类型:
--
作者:
Favreau E

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蚁群的祖先中有一只蚁后和她的非生殖工蚁。地中海大头蚁Pheidole pallidula的许多群体也是如此,但不是所有群体。事实上,该物种还具有衍生形式的社会组织,在群体中有多个繁殖女王。两种社会形态的共存也在其他三种蚂蚁谱系中独立进化。在这些血统中的每一个,抑制重组的表基因区域的变体决定了社会形态。这可能是因为表基因区域可以将来自多个基因座的有利等位基因组合联系在一起。因此,我们假设,大头蚂蚁的群体女王数量也是由一个表基因区域决定的。为了验证这一点,我们进行了广泛的群体遗传分析和基因组比较。我们没有发现单个和多个蜂王群之间存在表基因样区分化的证据。我们的结果表明,复杂的社会多态可以在没有超级基因的情况下进化和维持。
Ant colonies ancestrally contained one queen and her non-reproductive workers. This is also the case for many but not all colonies of the Mediterranean big-headed antPheidole pallidula. Indeed, this species also has a derived form of social organization with multiple reproductive queens in the colony. The co-existence of two social forms also independently evolved in three other lineages of ants. In each of those lineages, variants of a supergene region of suppressed recombination determine social form. This is likely because supergene regions can link advantageous combinations of alleles from multiple loci. We thus hypothesized that a supergene region also determines colony queen number in the big-headed ant. To test this, we performed extensive population genetic analyses and genomic comparisons. We find no evidence of a supergene-like region with differentiation between single- and multiple-queen colonies. Our results show that a complex social polymorphism can evolve and be maintained without supergenes.
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