Document of bibliographic reference 347809

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Chromosome diversity and evolution in Helicoidea (Gastropoda: Stylommatophora): a synthesis from original and literature data

Abstract

We performed a molecular and a comparative cytogenetic analysis on different Helicoidea species and a review of all the available chromosome data on the superfamily to provide an updated assessment of its karyological diversity. Standard karyotyping, banding techniques, and Fluorescence in situ hybridization of Nucleolus Organizer Region loci (NOR-FISH) were performed on fifteen species of three families: two Geomitridae, four Hygromiidae and nine Helicidae. The karyotypes of the studied species varied from 2n = 44 to 2n = 60, highlighting a high karyological diversity. NORs were on a single chromosome pair in Cernuella virgata and on multiple pairs in four Helicidae, representing ancestral and derived conditions, respectively. Heterochromatic C-bands were found on pericentromeric regions of few chromosomes, being Q- and 4′,6-diamidino-2-phenylindole (DAPI) negative. NOR-associated heterochromatin was C-banding and chromomycin A₃ (CMA₃) positive. Considering the available karyological evidence on Helicoidea and superimposing the chromosome data gathered from different sources on available phylogenetic inferences, we describe a karyotype of 2n = 60 with all biarmed elements as the ancestral state in the superfamily. From this condition, an accumulation of chromosome translocations led to karyotypes with a lower chromosome number (2n = 50–44). This process occurred independently in different lineages, while an augment of the chromosome number was detectable in Polygyridae. Chromosome inversions were also relevant chromosome rearrangements in Helicoidea, leading to the formation of telocentric elements in karyotypes with a relatively low chromosome count.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000699187900001

Bibliographic citation

Petraccioli, A.; Crovato, P.; Guarino, F.M.; Mezzasalma, M.; Odierna, G.; Picariello, O.; Maio, N. (2021). Chromosome diversity and evolution in Helicoidea (Gastropoda: Stylommatophora): a synthesis from original and literature data. Animals 11(9): 2551. https://dx.doi.org/10.3390/ani11092551

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true