scholarly journals Karyological Diversification in the Genus Lyciasalamandra (Urodela: Salamandridae)

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1709
Author(s):  
Marcello Mezzasalma ◽  
Gaetano Odierna ◽  
Agnese Petraccioli ◽  
Michael Veith ◽  
Fabio Maria Guarino
Keyword(s):  
Cytogenetic Analysis ◽  
Interstitial Position ◽  
Lineage Divergence ◽  
Paracentric Inversions

We performed the first cytogenetic analysis on five out of the seven species of the genus Lyciasalamandra, including seven subspecies, and representatives of its sister genus Salamandra. All the studied species have a similar karyotype of 2n = 24, mostly composed of biarmed elements. C-bands were observed on all chromosomes, at centromeric, telomeric and interstitial position. We found a peculiar taxon-specific NOR configuration, including either heteromorphic and homomorphic NORs on distinct regions of different chromosomes. Lyciasalamandra a.antalyana and L. helverseni showed two homomorphic NORs (pairs 8 and 2, respectively), while heteromorphic NORs were found in L. billae (pairs 6, 12), L. flavimembris (pairs 2, 12), L. l. luschani (pairs 2, 12), L. l. basoglui (pairs 6, 12), L. l. finikensis (pairs 2, 6) and S. lanzai (pairs 8, 10). Homomorphic NORs with an additional supernumerary site were shown by S. s. salamandra (pairs 2, 8) and S. s. gigliolii (pairs 2, 10). This unexpected highly variable NOR configuration is probably derived from multiple independent NOR translocations and paracentric inversions and correlated to lineage divergence in Lyciasalamandra. These results support the taxonomic validity of the studied taxa and are consistent with a hypothesized scenario of synchronous evolution in the genus.

Cytogenetic analysis of a new subcomplex of Simulium exiguum (Diptera: Simuliidae) in amazonian Ecuador

1998 ◽  
Vol 88 (3) ◽  
pp. 247-255 ◽  
Author(s):  
M. Charalambous ◽  
M. Arzube ◽  
S. Lowell
Keyword(s):  
Seasonal Variation ◽  
Genetic Relationship ◽  
Cytogenetic Analysis ◽  
River System ◽  
The Other ◽  
Species Status ◽  
Amazonian Ecuador ◽  
Close Genetic Relationship ◽  
Paracentric Inversions

AbstractTwo new cytotypes of the onchocerciasis vector blackfly Simulium exiguum Roubaud are described from amazonian Ecuador. As transmission of the disease does not occur in the region, the two cytotypes are not currently vectors, The Napo form (N = 113) differs cytologically from the chromosomal standard of the species, the Cayapa form, through possession of the fixed paracentric inversions IL-E and IIIL-L; the Huatarac form (N = 22) differs by the fixed inversions IL-L and IIIL-D + L. Both forms form a subcomplex, termed the ‘amazonian’ subcomplex, through sharing the fixed inversion IIIL-L. They also share a number of polymorphic inversions, but neither form possesses sex-linked inversions. The fixed and sex-linked inversions of the previously described Aguarico form were found to be polymorphic and autosomal in the Napo and Huatarac forms, suggesting a close genetic relationship among these forms. The Napo form is distributed throughout the Napo river system (except in the Rio Huatarac) and found in the Rio Aguarico, whereas the Huatarac form is unique to the Rio Huatarac. As their distributions in this study were allopatric, the species status of the two cytotypes could not be tested. The Aguarico form was not found in the Rio Aguarico, nor in any of the other rivers sampled. Whether the Napo form has replaced the Aguarico form in the Rio Aguarico, or whether its absence is due to seasonal variation requires further investigation.

scholarly journals Cytotaxonomy, heterochromatic polymorphism and natural triploidy of a species of Astyanax (Pisces, Characidae) endemic to the Iguaçu river basin

2007 ◽  
Vol 50 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Daniel Luis Zanella Kantek ◽  
Rafael Bueno Noleto ◽  
Alberto Sérgio Fenocchio ◽  
Marta Margarete Cestari
Keyword(s):  
River Basin ◽  
Restriction Enzyme ◽  
Cytogenetic Analysis ◽  
C Banding ◽  
Acrocentric Chromosomes ◽  
Clear Differentiation ◽  
Paracentric Inversions ◽  
Iguaçu River

Cytogenetic analysis with Astyanax sp. D revealed a karyotype of 2n=50 with 2M+26SM+6ST+16A, besides a triploid specimen showing 2n=75 chromosomes (3M+39SM+9ST+24A). C-banding strongly stained the terminal regions of several SM-ST-A chromossomes. Two pairs of acrocentric chromosomes presented interstitial heterochromatin, this state being polymorphic and occuring due to possible paracentric inversions. The results obtained with the AluI restriction enzyme and A3 chromomycin were similar to the C-banding. Relationships were proposed between Astyanax sp. D and A. scabripinnis, as well as considerations for a possible origin of the triploid specimen (2n=3x=75). When comparing the present results with cytogenetic features of other endemic Astyanax species in the Iguaçu river (A. sp. B and C), a clear differentiation was observed between them, indicating cytogenetics as an important cytotaxonomic tool.

Hypoxia induced chemo-resistance of central giant cell granulomas and their treatment options based on cytogenetic analysis of Bcl2 gene

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Mohamed I Mourad ◽  
Lyla Tharwat ◽  
Rehab Allah Ahmed ◽  
Laila E Amin ◽  
Mona Denawar ◽  
...  
Keyword(s):  
Giant Cell ◽  
Cytogenetic Analysis ◽  
Treatment Options ◽  
Bcl2 Gene

Development and Cytogenetic Analysis of Perennial Wheat in Cold Region

2013 ◽  
Vol 38 (8) ◽  
pp. 1378-1386 ◽  
Author(s):  
Hai-Bin ZHAO ◽  
Yan-Ming ZHANG ◽  
Chun-Long SHI ◽  
Xiao-Dan YAN ◽  
Chao TIAN ◽  
...  
Keyword(s):  
Cytogenetic Analysis ◽  
Cold Region ◽  
Perennial Wheat

scholarly journals A Dual Gender Rare Case with 47,XY, + 18/46,XX Karyotype: Chimera or Mosaic?

2021 ◽  
Vol 11 (01) ◽  
pp. e41-e44
Author(s):  
Ravindran Ankathil ◽  
Foong Eva ◽  
Zulaikha Abu Bakar ◽  
Nazihah Mohd Yunus ◽  
Nurul Alia Nawi ◽  
...  
Keyword(s):  
Birth Weight ◽  
Blood Sample ◽  
Cell Line ◽  
Apgar Score ◽  
Cytogenetic Analysis ◽  
Rare Case ◽  
Trisomy 18 ◽  
Normal Female ◽  
Conventional Cytogenetic Analysis ◽  
Edwards Syndrome

Our objective is to report one rare case of dual gender chimerism involving abnormal male trisomy 18 and normal female karyotype. The baby was born full term with birth weight of 1.8 kg, not vigorous with light meconium stained liquor and Apgar score of 51, 85 and 910. Parents are 40 years old and mother is G6P5 + 1. The baby had clinical features of Edwards syndrome, and a blood sample was sent to Human Genome Centre, Universiti Sains Malaysia, Malaysia for cytogenetic analysis. Conventional cytogenetic analysis results showed two distinct sex discordant genetic cell lines XY and XX in 90:10 ratio. The male genetic cell line XY also showed trisomy 18 (47,XY, + 18) consistent with clinical diagnosis of male Edwards syndrome, whereas the second genetic cell line showed normal 46,XX female. The present case was reported as dual gender chimera with chi 47,XY, + 18/46,XX karyotype pattern. To the best of available knowledge, dual gender chimerism with abnormal male trisomy 18 and normal female karyotype has not been reported so far, and this case is reported for its rarity and as the first report.

Cytogenetic analysis of interspecific hybridization in oil-tea (Camellia oleifera)

Euphytica ◽  
2021 ◽  
Vol 217 (2) ◽  
Author(s):  
Yanmin Li ◽  
Tianwen Ye ◽  
Chunxia Han ◽  
Zhihua Ye ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Interspecific Hybridization ◽  
Cytogenetic Analysis ◽  
Camellia Oleifera
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