Ctenomys lami: The highest chromosome variability inCtenomys (Rodentia, Ctenomyidae) due to a centric fusion/fission and pericentric inversion system

2007 ◽  
Vol 52 (2) ◽  
pp. 171-180 ◽  
Author(s):  
Thales Renato O. de Freitas
Keyword(s):  
Pericentric Inversion ◽  
Centric Fusion ◽  
Chromosome Variability

Monophyleticism and Polyphyleticism in the Gekkonidae - a Chromosomal Perspective

1987 ◽  
Vol 35 (6) ◽  
pp. 641 ◽  
Author(s):  
M King
Keyword(s):  
Pericentric Inversion ◽  
Centric Fusion ◽  
Chromosomal Evolution ◽  
Heterogeneous Group ◽  
Ancestral Karyotype ◽  
Chromosomal Data ◽  
Group Comparisons

Kluge (1967, 1983) proposed that the four subfamilies within the Gekkonidae were monophyletic assemblages, but that the Gekkoninae could be divided into two tribes on the basis of hyoid apparatus structure. Whilst agreeing that four subfamilies were present in the Gekkonidae, Moffatt (1973) argued that those groups of non-Eublepharine gekkos which remained after the differentiation of the Diplo- dactylinae and Sphaerodactylinae, and which had not become sufficiently distinct to be classified into separate subfamilies, had been lumped together as the Gekkoninae. Subsequently, Russell (1976, 1979) found that at least seven distinct groups could be defined within the Gekkoninae on the basis of toe structure. In the present paper I compare chromosomal evolution in the monophyletic Diplodactylinae and that in the possibly polyphyletic Gekkoninae, to test whether the tribal subdivision made by Kluge (1983) is valid, or whether this is a far more heterogeneous group as Russell and Moffatt proposed. The chromosomal data from 47 of the 92 species show that the Diplodactylinae have evolved from a 2n = 38 all acrocentric ancestral karyotype by the processes of pericentric inversion and centric fusion. In contrast, an analysis of 74 species from the Gekkoninae shows that eight distinct putative ancestral karyomorphs are present, 2n=32, 34, 36, 38, 40, 42, 44 and 46, each of which is acrocentric or telocentric. Numerous fusions, inversions, additions and tandem fusions have occurred within each of these categories. These data suggest that the Gekkoninae are a polyphyletic assemblage, and group comparisons indicate that there is some agreement with the morphogroups proposed by Russell (1976).

scholarly journals Molecular organization of the X chromosome in different species of the obscura group of Drosophila.

Genetics ◽  
1992 ◽  
Vol 130 (3) ◽  
pp. 513-521 ◽  
Author(s):  
C Segarra ◽  
M Aguadé
Keyword(s):  
In Situ Hybridization ◽  
Rna Polymerase Ii ◽  
X Chromosome ◽  
Pericentric Inversion ◽  
Centric Fusion ◽  
Single Copy ◽  
Molecular Organization ◽  
Palearctic Species ◽  
Obscura Group

Abstract Nine single copy regions located on the X chromosome have been mapped by in situ hybridization in six species of the obscura group of Drosophila. Three Palearctic species, D. subobscura, D. madeirensis and D. guanche, and three Nearctic species, D. pseudoobscura, D. persimilis and D. miranda, have been studied. Eight of the regions include known genes from D. melanogaster (Pgd, zeste, white, cut, vermilion, RNA polymerase II 215, forked and suppressor of forked) and the ninth region (lambda DsubF6) has not yet been characterized. In all six species, as in D. melanogaster, all probes hybridize to a single site. Established chromosomal arm homologies of Muller's element A are only partly supported by present results since two of the probes (Pgd and zeste) hybridize at the proximal end of the XR chromosomal arm in the three Nearctic species. In addition to the centric fusion of Muller's A (= XL) and D (= XR) elements, the metacentric X chromosome of the Nearctic species requires a pericentric inversion to account for this result. Previously proposed homologies of particular chromosomal regions of the A (= X) chromosome in the three species of the D. subobscura cluster and of the XL chromosomal arm in the three species of the D. pseudoobscura cluster are discussed in light of the present results. Location of the studied markers has changed drastically not only since the divergence between the melanogaster and obscura groups but also since the Palearctic and Nearctic species of the obscura group diverged.

Chromosome polymorphism in Holochilus venezuelae (Rodentia: Cricetidae): C- and G-bands

Genome ◽  
1991 ◽  
Vol 34 (1) ◽  
pp. 13-18 ◽  
Author(s):  
N. Sangines ◽  
M. Aguilera
Keyword(s):  
Pericentric Inversion ◽  
Chromosomal Polymorphism ◽  
Centric Fusion ◽  
Centromeric Heterochromatin ◽  
Fusion Product ◽  
Chromosome Polymorphism ◽  
Banding Patterns ◽  
Submetacentric Chromosome ◽  
Group A ◽  
Fusion Type

Karyological analysis of C- and G-banding patterns of 44 specimens of Holochilus venezuelae revealed six distinct karyomorphs, which were designated as follows: I (2n = 44; fundamental number (FN) = 56); II (2n = 45; FN = 58); IV (2n = 43; FN = 56);V(2n = 44; FN = 58); IV-a(2n = 42; FN = 56); and V-a (2n = 44; FN = 58). This chromosomal polymorphism is interpreted as the result of (i) one or two Robertsonian changes of the centric-fusion type, originating from one member of chromosome pair 10 and one of pair 11 (in karyotypes IV and V) and two metacentric chromosomes from pairs 10 and 11 (in karyotype IV-a); (ii) one pericentric inversion (in karyotype V-a) forming one submetacentric chromosome from the metacentric fusion product described above; and (iii) the presence of B chromosomes, which are almost completely heterochromatic and do not pair with any member of group A. The pattern of C-banding reveals that the first five pairs of metacentric chromosomes contain very little centromeric heterochromatin, while pair 6 and the fusion chromosomes (10/11 F) present a thick band. Extensive homology was found between G-banding patterns of Holochilus brasiliensis from Brazil and H. venezuelae. These facts support the hypothesis of a karyotypic evolution via centric fusions previously proposed for this genus.Key words: accessory chromosome, C- and G-banding, polymorphism, Holochilus venezuelae.

scholarly journals Fertility problems in males carrying an inversion of chromosome 10

Open Medicine ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 316-321
Author(s):  
Xinyue Zhang ◽  
Qingyang Shi ◽  
Yanhong Liu ◽  
Yuting Jiang ◽  
Xiao Yang ◽  
...  
Keyword(s):  
Spontaneous Abortion ◽  
Pericentric Inversion ◽  
Paracentric Inversion ◽  
Chromosome 10 ◽  
Partial Duplication ◽  
Recurrent Miscarriages ◽  
First Case ◽  
Fertility Problems ◽  
Male Carriers ◽  
Male Carrier

Abstract Chromosomal inversion is closely related to male infertility. Inversion carriers may produce abnormal gametes, which may lead to partial duplication/deletion of the embryonic chromosome and result in spontaneous abortion, a fetus with multiple anomalies, or birth of a malformed child. Genetic counselling remains challenging for these carriers in clinical practice. We report two male carriers with inversion of chromosome 10 and review 26 reported cases. In the first case, 46,XX,inv(10)(p13q22) of the fetal chromosome was found in prenatal diagnosis; this was inherited from the paternal side with 46XY,inv(10)(p13q22). Another case was a male carrier with inv(10)(q21.2q22.1). There have been 25 (89.3%) cases of pericentric inversion and three (10.7%) cases of paracentric inversion involving chromosome 10. Of 28 cases, nine were associated with pregestational infertility of the couples, while the other 19 cases were associated with gestational infertility of the couples or normozoospermia. The breakpoints at 10p15, 10p11, 10q11, and 10q21 were associated with pregestational infertility of the couples. The breakpoints at 10p15, 10p14, 10p13, 10p12, 10p11, 10q11, 10q21, 10q22, 10q23, 10q24, 10q25, and 10q26 were related to gestational infertility of the couples or normozoospermia. Although there is a high risk of infertility or recurrent miscarriages, carriers with inversion of chromosome 10 might produce healthy offspring. Natural pregnancy can be used as a choice for inversion carriers with recurrent spontaneous abortion.

Prenatal Diagnosis in Pericentric Inversion 6

2010 ◽  
Vol 10 (1-3) ◽  
pp. 175-178 ◽  
Author(s):  
J. Gazala ◽  
I. V. Amithkumar ◽  
J. Sabina ◽  
K.K. Praveena ◽  
J. Sujatha
Keyword(s):  
Prenatal Diagnosis ◽  
Pericentric Inversion

PERICENTRIC INVERSION OF CHROMOSOME 21 A POSSIBLE FURTHER CYTOGENETIC MECHANISM IN MONGOLISM

The Lancet ◽  
1962 ◽  
Vol 279 (7219) ◽  
pp. 21-23 ◽  
Author(s):  
J.E. Gray ◽  
D.E. Mutton ◽  
D.W. Ashby
Keyword(s):  
Pericentric Inversion ◽  
Chromosome 21

Centric Fusion of Chromosomes in a Set of Bovine Triplets

1966 ◽  
Vol 5 (5) ◽  
pp. 307-312 ◽  
Author(s):  
M.S. Herschler ◽  
N.S. Fechheimer
Keyword(s):  
Centric Fusion

scholarly journals A case of mental retardation having pericentric inversion on No. 9 chromosome (inv(9)(p11q13)).

1985 ◽  
Vol 61 (6) ◽  
pp. 242-244
Author(s):  
Suzue KANATA ◽  
Tetsuji KADOTANI ◽  
Yoko WATANABE ◽  
Nami MATSUO ◽  
Hidetoshi KODAMA ◽  
...  
Keyword(s):  
Mental Retardation ◽  
Pericentric Inversion
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