Cytogenetic studies on wild house mice from Belgium

Hübner, Roland; Koulischer, L

doi:10.1007/bf00127129

Cited by 16 publications

(18 citation statements)

References 10 publications

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“…In mainland areas, the Rb races occur singly or in groups surrounded by the much more widely distributed standard race. The large majority of studies of chromosomal hybrid zones in the house mouse have focused on contacts between a Rb race and the standard race, such as those in Belgium (Hu$ bner & Koulischer, 1990 ;Bauchau et al, 1990), Denmark (Nance et al, 1990 ;Fel-Clair et al, 1996, northern Scotland (Searle, 1991 ;Wallace et al, 1992 ;Searle et al, 1993), central Italy (Castiglia & Capanna, 1999, northern Spain (Gu$ ndu$ z et al, 2001) and Tunisia (Saı$ d & Britton-Davidian 1991 ;Saı$ d et al, 1993Saı$ d et al, , 1999. These studies have shown that hybrid zones between the standard race and a Rb race with a high diploid number (i.e.…”

Section: Introductionmentioning

confidence: 99%

Studies of mitochondrial DNA, allozyme and morphometric variation in a house mouse hybrid zone

et al. 2002

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An unusual chromosomal hybrid zone of the house mouse, Mus musculus domesticus, exists in Upper Valtellina, Northern Italy, consisting of four Robertsonian (Rb) races and the standard (all-acrocentric, or 2n = 40) race, all hybridizing freely within 10 km2. The hybrid zone in Valtellina provides an excellent opportunity to study the role of Rb fusions in reproductive isolation and speciation. This hybrid zone has already been well studied for the distribution of Rb fusions and the fertility of hybrids, but in order to understand the dynamics of the zone, a basic understanding of the origin and genetic similarity of the chromosomal races is necessary. This paper presents the results of three different methods of measuring genetic differentiation: multivariate analysis of morphological traits and analyses of allozyme variation and mitochondrial DNA sequences. The standard race is clearly distinguishable from the three Rb races by all three methods, but the Rb races are not distinguishable from one another. This provides strong evidence for our previous suggestions that the well-established Rb races in Valtellina are closely related, and that the standard race was introduced into the valley more recently from a distant source. The fact that the Rb races are indistinguishable is also consistent with our hypothesis that a within-village speciation event involving two of the races (Hauffe & Searle, 1992) was a recent occurrence. The low level of allozyme heterozygosity among the Rb races suggests that these populations are the products of at least one bottleneck. The present article substantially extends earlier studies and provides the first detailed morphological and molecular analysis of this complex hybrid zone.

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Section: Introductionmentioning

confidence: 99%

Studies of mitochondrial DNA, allozyme and morphometric variation in a house mouse hybrid zone

et al. 2002

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“…In Belgium the BBEL race characterised by 4.12 and 5.10, in Germany the DSTJ race with 5.15 and 13.14 and in Denmark the DKEA race with 2.5, 3.8 and 6.9 show staggered clines similar to those seen in the John o’Groats-standard hybrid zone, with intermediate homozygous forms at high frequency in parts of the hybrid zone [4,14,40,41,42,43]. As for the John o’Groats-standard hybrid zone, the degree of staggering of the different chromosomes differs according to the transect direction across the Belgian and German hybrid zones [40,41,42].…”

Section: Summary and Synthesismentioning

confidence: 97%

“…As for the John o’Groats-standard hybrid zone, the degree of staggering of the different chromosomes differs according to the transect direction across the Belgian and German hybrid zones [40,41,42]. In northern Italy, the most widely prevalent and presumably the first formed metacentric among chromosomal races there, 16.17, has a wider distribution than other metacentrics at the contact between the IBIN metacentric race and the standard acrocentric race [14,44].…”

Section: Summary and Synthesismentioning

confidence: 99%

Staggered Chromosomal Hybrid Zones in the House Mouse: Relevance to Reticulate Evolution and Speciation

Gündüz

Pollock

Giménez

et al. 2010

Genes

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In the house mouse there are numerous chromosomal races distinguished by different combinations of metacentric chromosomes. These may come into contact with each other and with the ancestral all-acrocentric race, and form hybrid zones. The chromosomal clines that make up these hybrid zones may be coincident or separated from each other (staggered). Such staggered hybrid zones are interesting because they may include populations of individuals homozygous for a mix of features of the hybridising races. We review the characteristics of four staggered hybrid zones in the house mouse and discuss whether they are examples of primary or secondary contact and whether they represent reticulate evolution or not. However, the most important aspect of staggered hybrid zones is that the homozygous populations within the zones have the potential to expand their distributions and become new races (a process termed ‘zonal raciation’). In this way they can add to the total ‘stock’ of chromosomal races in the species concerned. Speciation is an infrequent phenomenon that may involve an unusual set of circumstances. Each one of the products of zonal raciation has the potential to become a new species and by having more races increases the chance of a speciation event.

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“…a O rdered according to position of clines, with those centred closest to the centre of the metacentric race given first. b Hübner and Koulischer [1990]; Bauchau et al [1990]. c Searle et al [1993].…”

Section: Discussionmentioning

confidence: 99%

“…This was for zones in Belgium [Hübner and Koulischer, 1990;Bauchau et al, 1990], Northern Scotland and Central Italy [Spirito et al, 1980;Castiglia and Capanna, 1999] where quantitative clinal data were hitherto unavailable.…”

Section: Methodsmentioning

confidence: 99%

Properties of a Hybrid Zone between Highly Distinct Chromosomal Races of the House Mouse <i>(Mus musculus domesticus)</i> in Northern Italy, and Comparisons with Other Hybrid Zones

Hauffe

Giménez²,

Vega³

et al. 2011

Cytogenet Genome Res

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Here we provide the first detailed description of the hybrid zone between the Cremona chromosomal race of house mouse (ICRE; 2n = 22) and the standard all-telocentric race (40ST; 2n = 40), with full karyotypes of 106 individuals from 17 localities along a transect between the 2 races to the west of Lake Garda in Northern Italy. The ICRE race is characterised by 9 pairs of metacentric chromosomes in a homozygous state and we use the metacentric frequency data along the transect to fit tanh metacentric clines. The clines are narrow (5–8 km, standardised width) suggesting low hybrid fitness. However, the lack of occurrence of ICRE × 40ST F₁ hybrids and presence of other hybrid types suggests that the F₁ hybrids initially produced in this hybrid zone were at least partially fertile, despite having 9 meiotic trivalent configurations. We apply the same cline-fitting methodology to 3 previously studied hybrid zones between metacentric races and the 40ST race. Taken together with published clinal data on 4 further metacentric-40ST hybrid zones, we are able to make objective generalisations on the characteristics of such zones in the house mouse. Zones involving 22-chromosome races are narrower, on average, than other metacentric-40ST hybrid zones and do not show a tendency towards the generation of new races as found with zones where the metacentric race has a higher 2n. It appears that metacentric-40ST zones are unlikely to be sites of speciation (even when a 22-chromosome race is involved), although a mosaic structure to the hybrid zone may enhance this possibility. We make a comparison between metacentric-40ST zones and contacts between 2 metacentric races, for a comprehensive perspective of chromosomal hybrid zones in the house mouse.

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Cytogenetic studies on wild house mice from Belgium

Cited by 16 publications

References 10 publications

Studies of mitochondrial DNA, allozyme and morphometric variation in a house mouse hybrid zone

Studies of mitochondrial DNA, allozyme and morphometric variation in a house mouse hybrid zone

Staggered Chromosomal Hybrid Zones in the House Mouse: Relevance to Reticulate Evolution and Speciation

Properties of a Hybrid Zone between Highly Distinct Chromosomal Races of the House Mouse <i>(Mus musculus domesticus)</i> in Northern Italy, and Comparisons with Other Hybrid Zones

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