Open access peer-reviewed chapter

Comparative Cytogenetics Allows the Reconstruction of Human Chromosome History: The Case of Human Chromosome 13

By Rita Scardino, Vanessa Milioto and Francesca Dumas

Submitted: April 20th 2018Reviewed: June 8th 2018Published: November 5th 2018

DOI: 10.5772/intechopen.79380

Downloaded: 744


Comparative cytogenetics permits the identification of human chromosomal homologies and rearrangements between species, allowing the reconstruction of the history of each human chromosome. The aim of this work is to review evolutionary aspects regarding human chromosome 13. Classic and molecular cytogenetics using comparative banding, chromosome painting, and bacterial artificial chromosome (BAC) mapping can help us formulate hypotheses about chromosome ancestral forms; more recently, sequence data have been integrated as well. Although it has been previously shown to be conserved when compared to the ancestral primate chromosome, it shows a degree of rearrangements in some primate taxa; furthermore, it has been hypothesised to have a complex origin in eutherian mammals which has still not been completely clarified.


  • FISH
  • evolution
  • mammals
  • human synteny

1. Introduction

Comparative cytogenetics has been widely applied to many mammalian species [1, 2, 3] through banding methods and, later, with fluorescence in situhybridization (FISH) of whole chromosomes and bacterial artificial chromosome (BAC) probes; these approaches permit the definition of regions of chromosomal homology, rearrangements, and breakpoints, as well as elucidate phylogenetic relationships between taxa [4]. In addition, the comparative cytogenetic approach is particularly useful in the reconstruction of human chromosome (HSA) history. Indeed, parsimony analysis of homologies and rearrangements permits us to define ancestral chromosomal syntenies (synteny is the colocalization of two or more genetic loci) and derived ones [2]. Banding allows us to first evaluate rearrangements between species; the mapping of whole chromosomes through the chromosomal painting approach allows researchers to better define rearrangements at the molecular level, such as Robertsonian ones and breakpoints. At a finer level, the use of DNA cloned inside vectors such as yeast artificial chromosomes (YACs) or BAC, used as mapping probes, permits the evaluation of chromosomal dynamics [5, 6], defining marker orders and intrachromosome rearrangements. Moreover, the use of specific loci or repetitive probes permits the localization of specific sequences, such as repetitive ones, which are often supposed to be responsible for the plasticity of chromosomes [7, 8, 9, 10] and human genes involved in cancers [11].

More recently, the integration of cytogenetic data with sequence data has been proposed [12, 13, 14, 15, 16]. These kinds of data are available from genomic browsers and are helpful for testing previously proposed phylogenomic hypotheses and chromosomal organisation reconstructions.

In this review, we report the principal approach which has proven useful for studying human chromosome history by analysing previous cytogenetic and sequence data regarding human chromosome 13.


2. The reconstruction of human chromosome history

At least three or four principal approaches can be used to reconstruct human synteny history. In a comparative perspective, the analysis of banding data permits the identification of chromosomal homologies. In particular, the analysis of the banding patterns obtained by the enzymatic digestion of chromosomes in metaphases using proteolysis and Giemsa solution staining permits the identification of chromosomal homologies and principal rearrangements occurring between species. Consequently, by focusing attention on a single chromosome, it is possible to track the principal evolutionary steps involving each individual human chromosome [1].

Another approach is the analysis of comparative painting data; the painting approach consists of a whole chromosome undergoing FISH on cytogenetic preparations, allowing the identification of molecular level homologies, interchromosomal rearrangements and genomic breakpoints. First, human chromosome probes are mapped onto metaphases of target species (chromosome painting [CP]) [17], then, for a better comparison, animal chromosomal probes are mapped onto human metaphases in a reciprocal hybridization (RP) [18]. Subsequently, whole animal chromosomes are mapped onto other animal metaphases in an approach known as ZOO-FISH, Z-F [19]. The analysis of these data regarding a single chromosome, consequentially, permits the tracking of each change involving the human chromosome under study.

In addition, human chromosome evolution can be studied using another kind of probe, the BAC probe, containing an insert of 50–300 Kb of the human genome. It can be mapped by FISH onto the metaphases of many species. BACs are available for each human chromosome and can be purchased from the BAC/PAC Resource Center (Chori), and some of them are commercially available for medical diagnosis. These probes are very useful in detecting small interchromosomal rearrangements which are not detectable by painting and in defining marker order along chromosomes, thus revealing inversions, new centromere evolutions (new centromeres arise without the occurrence of inversions, maintaining the marker order), and duplications [3].

Comparative cytogenetics has been applied to reconstructing most human chromosome history; these published works have mainly been done by reviewing previous painting data or by mapping BAC probes on primates (see review in [2]) and other eutherian mammals; some works have analysed only specific chromosome regions (see Table 1 for representative works).

Furthermore, alignments of sequences (SA) of many mammal species, obtainable from the NCBI, UCSC, and Ensemble genome browsers, can be integrated with molecular cytogenetic information in order to shed light on the history and peculiar features characterising each human chromosome.

2.1. The evolutionary history of HSA 13

Human chromosome 13 has been sequenced, and it has been shown to be the largest acrocentric chromosome in the human karyotype. Currently, the NCBI reports 1381 total genes, 41 novel genes, and 477 pseudogenes for a size of 114.36 MB [47]. It is among the human chromosomes with the lowest percentage of duplicated sequences [48].

The analyses of classical and molecular cytogenetics, using comparative banding and chromosome painting, have allowed researchers to formulate hypotheses about its ancestral forms. In this report, we delineate the principal steps regarding the history of human chromosome 13, tracked through the analysis of previous cytogenetics literature and sequence data. We have reported a list of species analysed by painting or sequence information, chromosome homologues to human chromosome 13, human associations with HSA 13, chromosome type if available, references and methods from which we obtained the data, such as CP, RP, Z-F, and SA (see Table 2). The principal steps in the evolution of human chromosome 13 are illustrated in a graphical reconstruction of the mammal phylogenetic tree, Figure 1; the mammal phylogenetic tree has been drawn in agreement with previous ones [16, 49], with some modifications, and was created using Mesquite v.2.75 [50]. Among mammals, three major groups are distinguishable: monotremes (Prototheria, platypus), marsupials (Metatheria, opossum), and placental mammals (eutherian), with these last two known as Theria; among placental mammals, Afrotheria, Xenarthra, and Boroautherian are recognized, with the latter comprising Laurasiatheria and Euarchontoglires (or Supraprimates) [49]. In the mammalian phylogenetic tree are shown the orthologue blocks that correspond to human chromosome 13—in yellow—in representative eutherian species for which reciprocal chromosome painting is available; for some of them also DNA sequence alignments have been previously showed, see Table 2 for reference. For each species are reported chromosome ideograms on which human synteny 13 is found, and on the left of the ideograms are reported the species’ chromosome number and on the right HSA syntenies; the black circle is the centromere. Syntenies homologues of human chromosome 13 in platypus (Monotremata) are on chromosomes 2, 10, and 20, in opossum (Metatheria) are on chromosomes 4 and 7, and in chicken (Aves) are on chromosome 1. These chromosomes are reported in box because they are representative eutherian mammal outgroups and data come just from sequence alignments. When HSA 13 synteny, in yellow, is rearranged with just few human syntenies, these are represented in different colours and are reported on the right of the ideogram (e.g., in Indri chromosome 3, synteny 13 is fused with synteny 17 in red), whereas when HSA 13, in yellow, is rearranged with many human syntenies, these are represented by white segments for logistic issue (e.g., on chicken chromosome 1). Through painting and sequence analysis in mammals, human chromosome 13 has been previously shown to be conserved, with some exceptions (Table 2, Figure 1). Indeed, the homologues to human chromosome 13 are found as single conserved chromosomes in most representative mammalian orders analysed by chromosome painting, for example in Dermoptera, Pilosa, Carnivori (cat—Felis silvestris catusch A1), Lagomorpha (rabbit—Oryctolagus cuniculusch 8), Perissodactyla (horse—Equus caballusch 17), and Cetartiodactyla (cattle—Bos taurosch 12 and pig—Sus scrofach 11; in pig, the synteny is metacentric due to a new centromere formation). Human synteny 13 has gone to many rearrangements such as translocation and fission in other different groups; indeed, it is associated with one or more human syntenies due to translocation, as in Tubulidentata, Afrosoricida, Eulipotyphla, Macroscelidea, Sirenia, Pholidota, Chiroptera (Table 2). For example, among Chiroptera in Greater mouse-eared bat, on Myotis myotisch 5/6 is present human synteny 13 associated with many other human syntenies (8 lightgreen/4 bordoux/13 yellow/12 green/22 darkgreen) and among Rodentia in eastern grey squirrel, Sciurus carolinensisch 6, human synteny 13 in yellow is associated with other human syntenies (reported in white in Figure 1). Furthermore, human synteny 13 is fragmented into two segments or into many segments and associated with other HSA syntenies, for example in Carnivori (Canis—Canis lupus familiarisch 22, 28), in Proboscidea (elephant—Loxodonta Africanach 16, 26), and in Rodentia species such as birch mouse (Sicista betulinach 1, 9; in these last species, many other human syntenic associations are reported in white segments for logistic concern in Figure 1).

HSA chr.MethodsReferences
1Region study by BAC mapping
History by multidisciplinary approach
History by BAC mapping
2Region study by BAC mapping
History by BAC mapping
3Region study by BAC mapping
[23, 24, 25]
4Region study by BAC mapping
History by BAC mapping
Region study by BAC mapping
[28, 29]
5Region study by BAC mapping
[30, 31]
6History by BAC mapping[32, 33]
Region study by BAC mapping
8Brief history by BAC mapping[2]
9Region study by BAC mapping[37]
10History by BAC mapping[37, 38]
11History by BAC mapping[39]
12Brief history by BAC mapping[2]
13History by BAC mapping[40]
14Region study by BAC mapping[41]
15Region study by BAC mapping[41, 42]
16History by BAC mapping,
17History by BAC mapping[2]
18Region study by BAC mapping,
History by BAC mapping
Brief history by BAC mapping
20History by BAC mapping[45]
21Region study by BAC mapping
Brief history by BAC mapping
22Brief history by BAC mapping[2]
XBrief history by BAC mapping[2]
yRegion study by BAC mapping[46]

Table 1.

List of representative works, (references and methods) analyzing each human chromosome evolution and/or marker order in particular chromosomal region.

Chromosome typeChr.Human associationReferencesMethods
Galeopterus variegatusAcrocentric13[58]RP
Loxodonta africanaAcrocentric
16,2613, 6/13/3[59]
[12, 16]
Elephas maximusAcrocentric
16, 2613, 6/13/3[59]CP
Orycteropus aferSubmetacentric119/16/13/2/8/4[59, 60]CP
Chrysochloris asiaticaMetacentric813/18[61, 60]RP
Elephantulus rupestris
Elephantulus edwardii
Macroscidelis proboscidensSubmetacentric213/3/21/5[53]CP
Trichechus manatusMetacentric1913/3[62]CP
Sorex araneusMetacentricbc9/5/2/13/8/7[16, 63]CP, SA
Blarinella griseldaSubmetacentric313/10/13/4/5[63]CP
Neotetracus sinensisSubmetacentric
Hemiechinus auritus[64]CP
Talpa europaeaMetacentric62/13[65]CP
Dasypus novemcinctusSubmetacentric19[66]CP
Choloepus didactylusAcrocentric17[64]CP
Coniochaeta hoffmanniiAcrocentric12[66]CP
Tamandua tetradactylaMetacentric4, (2*)13/1[64, *66]CP
Bradypus torquatusAcrocentric12[67]CP
Bradypus variegatusAcrocentric17[67]CP
Mustela putorius[68]CP
Vulpes vulpesSubmetacentrics6,913/14, 2/8/13/3/19[69]RP
Canis lupus familiarisAcrocentrics(25*) 22, 28[*70]
[71, 72]
Felis silvestris catusAcrocentricA1[69]
[12, 13, 51]
Mephitis mephitisSubmetacentric19[73]CP
Procyon lotorMetacentric313/2[73]CP
Equus caballusAcrocentric17[74]
[13, 16]
Equus asinus11[19]Z-F
Equus burchelliSubmetacentric6q13/9[19]RP
Equus grevyi6q13/9[19]Z-F
Equus zebra hartmannae15[19]Z-F
Equus hemionus onager5q12/13/22[19]Z-F
Equus przewalskii16[19]Z-F
Diceros bicornisAcrocentric10[19]Z-F
Ceratotherium simum10[19]Z-F
Tapirus bairdii1[19]Z-F
Tapirus indicusAcrocentric18[19]Z-F
Tapirus pinchaque13[19]Z-F
Tapirus terrestris8[19]Z-F
Hemiechinus auritusSubmetacentrics5q,65/13, 2/22/12/13/12[64]CP
Manis javanicaSubmetacentric
1,9q13/5/2p, 18/13[64]
Manis pentadactylaSubmetacentric
1q, 1713/5/2, 13[75]CP
Bos taurusAcrocentric12[12, 16]
Sus scrofaMetacentric11[12, 16]
Camelus dromedariusMetacentric14[76]RP
Globicephala melasMetacentric15[77]Z-F
Hippopotamus amphibiousMetacentric15[77]Z-F
Giraffa camelopardalisMetacentric1214/15/13[77]Z-F
Okapia johnstoniAcrocentric11[77]Z-F
Moschus moschiferusAcrocentric17[77]Z-F
Oryctolagus cuniculusSubmetacentric813/12[78]
Mus musculus3,5,8,14,14[13]
Rattus norvegicus2,12,15,15,16[13]
Sciurus carolinensisSubmetacentric610/13[80]
Petaurista albiventerMetacentric1110/13[81]CP
Tamias sibiricusMetacentric1010/13[81]CP
Castor fibreSubmetacentric48/13[79]CP
Pedetes capensisSubmetacentric613/12/22[79]CP
Sicista betulinaMetacentric,
1,913/4/10/11/9/10, 3/6/313/19[79]CP
Eonycteris spelaeaSubmetacentricE1113/4/8/13[82]CP
Rhinolophus mehelyiAcrocentricR613/4/8/13[82]CP
Hipposideros larvatusMetacentricH113/3/21[82, 83]CP
Mormopterus planicepsMetacentricM713/18[82]CP
Myotis myotisMetacentricV5/64/8/13/12/22[82]CP
Aselliscus stoliczkanusMetacentric122/12/13/4/8/13[83]CP
Megaderma spasmaMetacentric1220/13/8b/4c[84]CP
Taphozous melanopogonSubmetacentric14c/8b/13/16b/7c/5a[84]CP
Avahi laniger12[85]CP
Daubentonia madagascariensis8p10/13[85]CP
Eulemur fulvus12[85]CP
Hapalemur griseus griseus15[85]CP
Indri indriSubmetacentric3p13/17[85]CP
Lemur cattaAcrocentric13[85, 86]BAC
Lepilemur ankaranensis14[87]CP
Lepilemur dorsalis6p[85, 87]CP
Lepilemur edwardsi6p[87]CP
Lepilemur leucopus1q ter[87]CP
Lepilemur microdon5p[87]CP
Lepilemur mittermeieri7p[87]CP
Lepilemur mustelinus8 ter[87, 85]CP
Lepilemur jamesi5q ter[87]CP
Lepilemur ruficaudatus5q prox[85, 87]CP
Lepilemur septentrionalis14[85, 87]CP
Microcebus murinusSubmetacentric13[85, 87]CP
Propithecus verreauxi6q5/13[85]CP
Otolemur crassicaudatusAcrocentric14[88]CP
Galago moholiMetacentric513/16/12[88]CP
Otolemur garnettiiSubmetacentric14[89]RP
Nycticebus coucangSubmetacentric18
[89, 90]RP
Alouatta belzebulAcrocentric14[91]CP
Alouatta carayaAcrocentric15 (20*)[92, *93]CP
Alouatta guariba guaribaAcrocentric14[93]CP
Alouatta seniculus arctoidea16[91]CP
Alouatta seniculus macconnelliSubmetacentric4q13/19[92]CP
Alouatta seniculus sara12[91]CP
Aotus lemurinusgriseimembraAcrocentric17[93, 94]CP
Aotus nancymaaeAcrocentric19[95]CP
Ateles geoffroyi[96]CP
Ateles belzebuth hybridusAcrocentric12[97]CP
Ateles belzebuth marginatusSubmetacentric12[98]CP
Ateles paniscus paniscusMetacentric413a/13b/3c/7b/1a2[98]CP
Brachyteles arachnoidesAcrocentric20[98]CP
Callicebus donacophilus pallescensAcrocentric15[99]CP
Callicebus lugensSubmetacentric11/13–12/13[100]CP
Callicebus molochAcrocentric21[101]CP
Callicebus cupreusSubmetacentric
7,173/21/13, 13/17[102]CP
Callimico goeldiiAcrocentrics19,1713/9/22, 13/17[18, 103]CP
Callithrix argentataSubmetacentrics2,113/9/22, 20/17/13[18, 103]CP
Callithrix jacchusSubmetacentrics1,513/9/22, 20/17/13[18, 103]CP
Cebuella pygmaeaSubmetacentrics1,413/9/22,20/17/13[18, 103]CP
Saguinus oedipusSubmetacentrics1,29/13/22,20/17/13[18, 103]CP
Cebus apella (Sapajus)Acrocentric17[104, 105]CP
Sapajus a. paraguayanusAcrocentric17[105]Z-F
Sapajus A. robustusAcrocentric17[105]Z-F
Cebus capucinusAcrocentric11[105]CP
Cebus nigrivitatusAcrocentric17[97]CP
Chiropotes israelitaAcrocentric15[95]CP
Chiropotes utahickiAcrocentric15[95]CP
Lagothrix lagotrichaSubmetacentric8[106]CP
Leontopithecus chrysomelasSubmetacentrics1,29/13/22,13/17/20[107]CP
Pithecia irrorataSubmetacentric822/13[108]CP
Cacajao calvus rubicundusAcrocentric13[108]CP
Saimiri sciureusAcrocentric16[18, 101]CP
Chlorocebus aethiopsMetacentric3[109]CP
Cercopithecus erythrogasterSubmetacentric12[110]Z-F
Cercopithecus neglectusMetacentric19[111]RP
Cercopithecus stampfliiSubmetacentric13[110]Z-F
Presbytis cristataMetacentric19[112]CP
Colobus guerezaMetacentric19[113]CP
Erythrocebus patasSubmetacentric15[111]RP
Hylobates concolorMetacentrics5,91/13; 1/4/10/13[114]CP
Hylobates klossii4q3/13[115]CP
Hylobates larMetacentric4q3/13[17]CP
Hylobates moloch4q3/13[115]CP
Macaca fuscataSubmetacentric16[116]CP
Nasalis larvatusMetacentric15[117]CP
Pygathrix nemaeusSubmetacentric17[118]CP
Semnopithecus francoisiMetacentric9[119]CP
Semnopithecus phayreiMetacentric9[115]CP
Symphalangus syndactylus15[17]CP
Pongo pygmaeusAcrocentric14[17]CP
Gorilla gorillaAcrocentric14[17]CP
Pan troglodytesAcrocentric14[17]CP
Tupaia belangeriAcrocentric17[120]CP
Tupaia minorAcrocentric16[121]CP
Gallus gallus1[51, 52]SA
Ornithorhynchus anatinusSubmetacentric
Monodelphis domesticaSubmetacentrics4,7[51, 52]SA

Table 2.

List of species analyzed by chromosomal painting (CP or reciprocal P) and/or sequence alignments (SA) and the references used. For each species is reported the human chromosome 13 homologous and eventually, if present other human associations.

Figure 1.

The mammalian phylogenetic tree showing the orthologue blocks that correspond to human chromosome 13—in yellow—in representative eutherian species for which reciprocal chromosome painting is available. For some species also DNA sequence alignments have been previously showed, seeTable 2for citation; in the tree, it is reported the ancestral synteny 13 form described by painting data analysis and in the box the eutherian ancestral chromosome 13 alternative reconstruction obtained through sequence data* [17]. The platypus (Monotremata), opossum (Metatheria) and chicken (Aves) chromosomes homologues are reported in the box to the low right; these last species are representative outgroups. Different colours represent HSA human syntenies which are reported on the right of the ideogram; white region represents parts of chromosomes covered by many different human syntenies; on the left of the ideogram are reported the species’ chromosome number of the 13 human homologues; the black circle is the centromere.

Through genome assembly analysis (alignments of sequences, SA), chromosome 13 has also been shown to be conserved in many mammals such as pigs, horses, and cats [13], very rearranged in mice (Mus musculusch 3, 5, 8, 14) [14] and fragmented in platypus (Ornithorhynchus anatinusch 2, 10, 20) [51]; moreover, it has also been shown to be present in the outgroups Opossum (Monodelphis domesticach 4, 7) and chicken(Gallus gallusch 1) [52] (Table 2, Figure 1). More recently, researchers analysing more than 19 placental mammals have hypothesised that the eutherian homologue 13 ancestor was fused with other human syntenies (HSA 4, and parts of HSA 2 and 8) [16]. This alternative reconstruction obtained through sequence data (in Figure 1 reported in the box*) see synteny 13 on EUT ch 1 associated with other HSA syntenies (2 orange/8 lightgreen/4 bordoux) according with previous sequence alignments work [17]. Part of this human associations (13/2/8/4) involving human synteny 13 is found through painting just in Greater mouse-eared bat ch 5/6, HSA syntenies 4/8/13/12/22, and for this reason, the alternative reconstruction do not find support through painting. Thus, the two reconstructions, by painting and by sequence analysis, regarding the ancestral synteny 13 in eutherian are not in agreement. Better analysis is needed in order to clarify this complex origin. The main issue to be considered to shed light on this issue is the use of appropriate outgroups in the reconstruction of the ancestral eutherian chromosome forms and the incomplete set of taxa analysed. Indeed, the lack of comparative chromosome painting between eutherians and other mammals, such as monotreme and marsupials, and on the other hand the lack of data on many genomes do not permit an exact reconstruction [16, 53].

Human chromosome 13 has also been analysed by mapping BAC probes onto representative Mammalian orders [40]; this work has especially focused attention on the history of this chromosome, with particular focus on intrachromosomal rearrangements and the potential relationships between evolutionarily new centromeres (ENCs) and neocentromeres occurring in clinical cases. Indeed, it has been hypothesised that neocentromere formation, a typical event in many tumours, could occur in correspondence to ENC position arising during evolution [54]. BAC mapping has permitted the study of small intrachromosomal rearrangements along the human 13 homologues and the identification of the occurrence of new evolutionary centromeres. Among mammals, evolutionary centromere repositioning on HSA 13 homologues have been shown in pigs and many primates such as for example on Lagothrix lagotrichachromosome 8 [40]; furthermore, a small inversion is common in nonprimate mammals [3, 40].

Although human chromosome 13 has been previously shown to be conserved, when compared to ancestral primate chromosomes, it shows some degree of rearrangements in certain primate taxa. Conflicting interpretations of classical banding data on human and great ape chromosome 13 have been published [1, 55, 56]. Among Hominoids, humans, chimpanzees, and orangutans share the same acrocentric form from which the gorillas’ differs by only a small paracentric inversion [57]. Among Strepsirrhini, it is a single conserved chromosome as seen for example in grey mouse lemur (Microcebus murinusch 13); however, in this species, synteny 13 is metacentric presumably due to an inversion or alternatively for the occurrence of a new centromere. Synteny 13 has gone to different rearrangements in other species such as, for example, in indri (Indri indrich 3), where it is fused with synteny 17 in red (Figure 1).

Among Catarrhines (Old World monkeys), the HSA 13 homologues differ in the presence of new centromeres, for example Vervet monkey (Chlorocebus aethiops); the Chlorocebuschromosome 3 are, indeed, metacentric if compared with the acrocentric human form (Figure 1).

Even if human chromosome 13 is presumably conserved in the ancestors of platyrrhines, HSA 13 homologue has gone into many rearrangements in New World monkeys; indeed, synteny 13 has gone to fission and subsequent translocation with other HSA syntenies in Common marmosets (Callithrix jacchus), resulting in chromosome 1 and 5 (covered, respectively, by HSA 13 yellow/9 blue/22 darkgreen and 13 yellow/17 red/20 lightgreen), and in Titi monkeys (Callicebus cupreus) resulting in ch 7 and 17 (covered, respectively, by HSA 3 fuxia/21 lightblue/13 yellow and 13 yellow/17 red; Figure 1). Furthermore, some intrachromosomal rearrangements, such as inversions and new centromeres, have been shown by BAC in other Platyrrhini [40].


3. Conclusion

Classic cytogenetics, using banding, and molecular cytogenetics, using painting or other mapping probes such as BAC, are useful methods for reconstructing human chromosome history in a comparative approach with mammals. Although human chromosome 13 has previously been shown to be conserved in mammals, it is less conserved then previously claimed; indeed, some interchromosomal rearrangements have been demonstrated through painting, and intrachromosomal rearrangements have been shown by BAC mapping in various taxa; for this reason, further analysis is needed. Furthermore, the ancestral eutherian form has yet to be elucidated, as contrasting results continue to be shown through painting and sequence data comparison.



Thanks to the “Fondazione Intesa San Paolo Onlus” which supported this work by funding the project “Evoluzione genomica in Primates” (2016-NAZ-0012, CUP, B72F16000130005) of F.D.


Conflict of interest

We have no conflicts of interest.

© 2018 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Rita Scardino, Vanessa Milioto and Francesca Dumas (November 5th 2018). Comparative Cytogenetics Allows the Reconstruction of Human Chromosome History: The Case of Human Chromosome 13, Cytogenetics - Past, Present and Further Perspectives, Marcelo Larramendy and Sonia Soloneski, IntechOpen, DOI: 10.5772/intechopen.79380. Available from:

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