Fluorescent in situ hybridization and characterization of the SalI family of satellite repeats in the Haliotis L. species (abalone) of the Northeast Pacific.
The SalI satellite repeat previously identified in Haliotis L. (abalone) was thought to be present in H. rufescens and absent in H. fulgens. However, we show here that SalI is also found in H. fulgens and is not useful for screening hybrid individuals bred in aquaculture or occurring naturally in the wild. SalI is a family of predominantly subtelomeric tandemly repeated sequences, and sequenced clones revealed clustering to species and little intraspecific variation. Analysis of SalI sequence divergence between Haliotis species of the Northeast Pacific revealed that evolutionary distances correlate well with bathymetric and latitudinal species distributions. Analysis of the structure of the tandem repeats revealed two regions of high sequence conservation that may contain conserved transcription factor binding sites, a surprise for an apparently "non-coding" tandem repeat. We speculate that these regions might be involved in heterochromatin silencing, perhaps mediated via transcriptional activity and RNA interference. The repeats show substantial differences in their chromosomal distributions, even between individuals of the same species, indicating a dynamic organization of repeats, perhaps mediated via sequence homogenization.
Hernández-Ibarra
Norma Karina
NK
Aquaculture Genetics Lab, Centro de Investigaciones Biológicas del Noroeste S. C, La Paz B.C.S, México.
Leitch
Andrew R
AR
Cruz
Pedro
P
Ibarra
Ana M
AM
D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D016384:Consensus Sequence; D004276:DNA, Satellite; D004463:Ecology; D049851:Gastropoda / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D010140:Pacific Ocean; D019601:Pacific States; D016415:Sequence Alignment; D020080:Tandem Repeat Sequences
D004276:DNA, Satellite