Sella Gabriella, Bovero Stefano, Ginepro Marco, Michailova Paraskeva, Petrova Ninel, Robotti Carlo Alberto, Zelano Vincenzo
Department of Animal and Human Biology, University of Turin, Italy.
Genome. 2004 Apr;47(2):332-44. doi: 10.1139/g03-128.
Inter- and intracytogenetic variability was analyzed in 13 natural Palearctic populations of Chironomus riparius Meigen 1804 (syn. Chironomus thummi) by examining hereditary and somatic aberrations (mainly inversions) of the salivary gland polytene chromosomes. In total, 77 different types of inherited inversion sequences and 184 different types of somatic inversions were found. The median percent frequency of inherited inversions was 1.4% and karyotypic divergence between populations was very low. Most hereditary inversions were endemic and always in a heterozygous state. Only six inversion sequences, each of them shared by two very distant populations, may be considered a relic of very ancient ancestral inversions. Unlike inherited inversions, occurrence of somatic aberrations seems to increase with the overall rise in the level of heavy metal pollution of the sediments from which larvae were sampled. In contrast with what occurs in populations of other chironomid species, populations of C. riparius do not seem to undergo a process of cytogenetic differentiation.
通过检查唾液腺多线染色体的遗传和体细胞畸变（主要是倒位），对13个古北区自然种群的里氏摇蚊（Chironomus riparius Meigen 1804，同物异名：Chironomus thummi）的细胞遗传学种间和种内变异性进行了分析。总共发现了77种不同类型的遗传倒位序列和184种不同类型的体细胞倒位。遗传倒位的中位频率百分比为1.4%，种群间的核型差异非常低。大多数遗传倒位是地方性的，并且总是处于杂合状态。只有六个倒位序列，每个序列由两个非常遥远的种群共享，可能被认为是非常古老的祖先倒位的遗迹。与遗传倒位不同，体细胞畸变的发生似乎随着采样幼虫的沉积物中重金属污染水平的总体上升而增加。与其他摇蚊物种的种群情况相反，里氏摇蚊的种群似乎没有经历细胞遗传学分化过程。
