Genetic basis for variation in the number of cephalic pores in a hybrid zone between closely related species of goby, Gymnogobius breunigii and Gymnogobius castaneus
Genetic basis for variation in the number of cephalic pores in a hybrid zone between closely related species of goby, Gymnogobius breunigii and Gymnogobius castaneus
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近缘虾虎鱼、布氏裸鮈鱼和栗裸鮈鱼杂交区头孔数量变异的遗传基础
DOI：
10.1093/biolinnean/blab033
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发表时间：
2021
影响因子：
1.9
通讯作者：
Kitano Jun
中科院分区：
文献类型：
--
作者：
Kakioka Ryo;Kume Manabu;Ishikawa Asano;Ansai Satoshi;Hosoki Takuya K;Yamasaki Yo Y;Nagano Atsushi J;Toyoda Atsushi;Kitano Jun
利用不同生境的种群或物种由于不同的适应，在感官知觉上可能有所不同。在硬骨鱼中，水流是通过神经乳头（侧线系统的末端器官）感知的。虽然不同栖息地的鱼类在神经乳突上存在差异，但我们对这种差异的遗传基础知之甚少。在这里，我们调查的遗传基础之间的杂交区日本Gymnogobius breunigiandGymnogobius castaneus眶上神经瘤的变化。前者有眶上管神经瘤和6个头孔，而后者只有浅表神经瘤，眶上区没有管或孔。我们的基因组分析表明G. BreunigiandG.栗树主要分布在下游和中上游。在日本北方的一条河流中，在两个物种栖息地之间的地点发现了杂交种。这些杂种表现出异常的头孔。使用这个杂交区，我们进行了全基因组关联研究，并确定了一个位点显着相关的孔的数量。杂交区的基因组渐变分析表明，该位点的渐渗率高于背景基因组，表明该位点可能存在适应性渐渗。
Populations or species exploiting different habitats can differ in sensory perception as a result of divergent adaptation. In bony fish, the water current is perceived via neuromasts, the end organ of the lateral line system. Although fish in different habitats are known to vary in neuromasts, we know little about the genetic basis for such variation. Here, we investigate the genetic basis for variation in supraorbital neuromasts in a hybrid zone between the Japanese gobiesGymnogobius breunigiiandGymnogobius castaneus. The former has supraorbital canal neuromasts with six cephalic pores, whereas the latter has only superficial neuromasts with no canals or pores in the supraorbital region. Our genomic analysis showed thatG. breunigiiandG. castaneusoccur mainly in the lower and mid/upper reaches, respectively. In a river in northern Japan, hybrids were found at the sites between the habitats of the two species. These hybrids exhibited anomalies of cephalic pores. Using this hybrid zone, we conducted genome-wide association studies and identified one locus significantly associated with the number of pores. Genomic cline analysis in the hybrid zone demonstrated that this locus exhibited a higher introgression rate compared with the genomic background, indicating the possibility of adaptive introgression.