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The occurrence of cancer in vertebrates: a mini review

Abstract

Neoplasia is a multilevel condition caused by irregularities over the genome, which can lead to a fatal result. To fully understand this phenomenon, an evolutionary challenge has risen during the last decades, away from human limits, driving the scientific quest into the wild life. The study of wild vertebrate populations in their natural habitats has shown that cancer is rather prominent. Thus, the diversity of vertebrates reported with some form of neoplasia is quite scattered through a variety of habitats. However, some species constitute exceptions by exhibiting cancer-protective features, driven by certain loci in their DNA. It is obvious that from an evolutionary standpoint, the incidence of cancer in different taxa is nowadays studied by seeking for patterns and their roots. The main purpose of the evolutionary approach is no other than to answer a fundamental question: Could cancer be ultimately regarded as another evolutionary force conducive to the formation or shaping-up of species?

Introduction

Cancer is a multidimensional phenomenon in which a single cell or a group of cells are being involved in abnormal/non-adjustable growth. The resulting mass lesions are capable of following two different paths: they can remain benign or invade other parts of the body, as metastatic tumors. Cancer is a consequence of the organism’s multicellularity and a prime example of multilevel selection [1], i.e. cancer is a complex phenomenon driven by different types of selective forces. In order to gain a more holistic view of the disease, it is necessary to approach it by different angles and disciplines. Τo understand the disease, most research has focused on molecular and cellular processes in specific types of neoplasia [2]. So far, major lines of investigation, among others, include the pathology of the disease, its developmental stages, functional mechanisms of cancer cells and the polyclonality of tumors in an effort to formulate effective cure treatments. Over the last two decades, the prospect of studying cancer by exploring the relationship of the evolutionary process and the environment has emerged [ [3] and references therein]. Although the idea of considering cancer as an evolutionary phenomenon is not entirely new, little attention has been paid to the applications and assumptions of evolutionary biology for understanding neoplastic development [3]. More or less, the origin and progression of cancer are highly connected with the evolutionary concepts and the environment itself [1]. As a consequence, a growing number of scientists try to clarify what is going on about the appearance of cancer in higher taxa. However, understanding the complexity of the disease as a whole, dictates a multidisciplinary approach that may give new insights and prospects. As a result, it seems that much more attention has to be put on the wild populations and their natural habitat, of which very few items are known so far.

The evolutionary viewpoint of neoplastic existence above species level approximates the process across geological eras. Such an approach includes, among others, the figuring out of the total number of species in which neoplasia has been reported. The main purpose remains to be the acknowledgment of diversity from individual to population level and the ecological stress put on them. Some questions that arise considering the above are: How many different species have been recorded with neoplasia? At what extent does Darwinian evolution shape the phenology of cancer in studied taxa? Are there any organisms that possess cancer-protective mechanisms? Moreover, a complex task like this requires seeking for footprints and elements hidden in the past. In order to do so, it is crucial to run through the fossil record and the provided data aiming to answer fundamental questions about the origin of cancer itself in the evolutionary time. One of the most important queries that has to be answered concerns the origin of neoplasia, the circumstances under which this happened and the taxa involved.

Neoplasia in vertebrates

In this section an overall recording of reported incidence of neoplasia in vertebrate species is attempted based on the scientific journal articles. This approach excludes domesticated animals and model organisms, which are used for all kinds of research experiments. Our focus is mainly restricted on species that live in their natural environment or protected areas.

Cancer appears to be no exception to most animal species and definitely it is not a “privilege” for some. On the contrary, incidents of neoplasia have been reported in a plethora of species from several habitats (Table 1), covering a large number of vertebrate families (Table 2). The diversity of organisms, which have been reported with neoplasia, is spread in many different habitats, each of them applying differential and particular pressure on species performance.

Table 1 Vertebrate taxa bearing neoplastic incidents, categorized according to their habitat
Table 2 Classification of vertebrate species that have been reported with neoplasia

Aquatic habitats

Despite the fact that neoplastic incidents have been reported in about 40 distinct species of marine mammals, classified in more than 10 families (Table 2), the frequency in these taxa seems to be low [4]. Most of the marine mammals follow the general pattern of marine vertebrates. However, dolphins (family: Delphinidae) are those mammals in which neoplasia has been reported with greater frequency compared to other marine families [4]. Special reference has to be made in the case of beluga whale (Delphinapterus leucas) and its populations which are found at St. Lawrence River in Canada [1, 4,5,6,7,8]. In populations of this area, the incidence of cancer is approaching or even exceeding that of humans [7] while its rate is going up to 37% [4]. Exploring further the aquatic habitats, our attention moves forward to the class of Chondrichthyes, which includes a large group of the most effective ocean predators, i.e. sharks. Sharks, such as the great white (Carcharodon carcharias), exhibit low incidence of neoplasia [9, 10].

Terrestrial habitats

Moving from the aquatic environment to land, animal diversity is spreading in a variety of habitats while there is no specific pattern considering the presence of neoplasia. In primates, two of the most known groups, chimpanzees and baboons, exhibit a lot of similarities about the appearance of neoplasia [11, 12]. In the past, it was thought that cancer was unusual in great apes, but, nowadays, it is becoming more and more of a conventional occurrence [see also 11]. The appearance of neoplasia is largely related to the older age classes in both hominid and non-hominid primates [see also 11, 12]. So, the older a chimpanzee is, the more likely is to develop a neoplastic event. Moreover, an interesting fact is that female individuals appear to be more vulnerable to cancer than the males [11]. This situation is similar in non-hominid primates, such as Old World monkeys [12,13,14].

A special case in the terrestrial habitat is the Tasmanian devil (Sarcophilus harrisii) [6,7,8, 15,16,17], the largest carnivorous marsupial. The Tasmanian devil is autochthonous in Tasmania and the observed tumors were identified as a particular type of contagious cancer, which is known as DFTD (Devil Facial Tumor Disease) [6,7,8, 15,16,17]. DFTD generally affects facial tissues, jaws and neck, and causes significant deformation of their soft parts [6]. The disease is transmitted through biting during social interactions and in most cases leads to death within six months from the first appearance of symptoms [17].

Across the diverse class of birds, neoplasia is reported in 34 species sorted in 13 families (Table 2). Neoplasia is more common in Psittaciformes, followed by Galliformes, Strigiformes and Falconiformes [18]. The dominant presence in the order of Psittaciformes may be the outcome of the observed longevity among the species comprising this order [18]. It is noteworthy that all families have different types of neoplasia but, as a pattern, lymphoma is more common followed by carcinoma and adenocarcinoma [18].

The reported neoplasia in reptiles (class: Reptilia) is unusual to rare compared to that for mammalian and avian classes [19]. In turtles (order: Testudines), the frequency of reported neoplasia and metastasis, in both terrestrial and aquatic species, appears to be rare [19, 20]. In lizards we have no sound evidence that the frequency of neoplastic events is considerable in wild populations. On the other hand, the percentage of reports in captive populations has increased over the recent years from 0.7% to 5.9% [20]. Snakes are mostly reported with liver and skin cancer [20, 21] but no specific pattern has been identified so far.

How back in time does neoplasia go?—Fossil record

Cancer is present in many species throughout the animal kingdom, spreading out in several families of six vertebrate classes. Nevertheless, the following question arises. How old are these incidents of neoplasia and under which conditions did they appear? Extended evidence is related to dinosaurs, which had been dominating our planet for about 185 million years.

The fossil record reveals that neoplastic incidents have been recorded in several dinosaur species of the Mesozoic Era [22, 23]; most of the evidences refer to tumors observed in bones. At first, cancerous tumors were considered to be rare as, initially, their appearance was restricted to the Hadrosauridae [22]. Such an example was the presence of an ameloblastoma neoplasm in the lower jaw of a specimen referred as Telmatosaurus transsylvanicus in the early Cretaceous [23]. A more extensive and meticulous study of the fossil record has led to the identification of more neoplastic types in different taxa. The first presence of neoplasia, apart from the Hadrosaurid family, was found in a dinosaur fossil record classified in the Titanosaurs, in Brazil [22]. Furthermore, metastatic cancer and cases of osteoma have been found in the fossil record of Mosasaurs, a group of large marine reptiles, of the Jurassic period [24]. Because of the intense neoplasia presence in the Hadrosaurid group, compared with other taxa, this possible pattern may indicate a genetic propensity or, alternatively, reflect specific environmental stress affecting this target group [24].

The whole data set, the different disciplines and the large complexity of the evolutionary nature of cancer contribute to one aspect, which is answering a basic question that mostly precedes the rest: Could cancer eventually be considered as another evolutionary phenomenon that contributes to the formation or shaping-up of species?

Molecular tolerance, durability and resistance

Assuming that every healthy cell has similar endogenous risk to bypass the control/repair mechanisms and paths, and therefore, accumulate mutations in its DNA, the animals of larger body mass/size and longevity, such as elephants and whales [4, 7], should have a higher risk of cancer than smaller ones [25]. However, the data so far tend to reach to a threshold, a phenomenon called Peto’s paradox, supporting that the incidence of cancer at the species level is not related to the number of body cells or lifespan [1, 2, 26, 27]. This trend is confirmed by the fact that there have been only few cases of cancer in whales, while at the same time, carcinogenesis has been very often reported in many other smaller mammals [7]. Therefore, a major question in cancer biology arises: How much and in what ways do animals protect themselves from such pathogeny?

A gene, known as TP53, is found in many animal genomes and in most malignant cases is either damaged or inactive [25]. Under normal conditions, the gene encodes a tumor suppressor protein [25, 28] that senses when DNA is damaged or a cell is under stress [25]. In such occasions, the produced protein either slows the cell growth (while the damage is still under repair) or triggers cell death if the stress exceeds a tolerable threshold [25]. Large animals, such as elephants, may potentially reduce cancer risk by having extra copies of TP53 [8, 25] or other genes that encode tumor suppressor proteins [25, 29]. In the African elephant (Loxodonta africana) genome, it has been confirmed that there is a set of a single TP53 gene and 19 retrogenes (TP53RTG), a number much higher than that of related species in the Proboscidea order, extinct or not. Elephant cells have an increased response to DNA-damage which is mediated by a hyperactive TP53 signaling pathway, depending on the number of copies of retrogenes [25].

Spontaneous neoplasia is apparently different, both by cause and pathogenicity, in different mammalian species [7]. Some mammals, however, possess very special phenotypes which are equipped with important traits for survival [28]. Major examples are two phylogenetically distant species of mole rats, the blind Spalax spp. and the naked Heterocephalus glaber [1, 25, 28, 30]. The blind mole rat (Spalax spp.) has been found to show an extraordinary tolerance to hypoxia, cancer-resistance and longevity despite its small body size [28, 30]. It is remarkable that Spalax is the only genus in which no malignant neoplasia has been detected in thousands of individuals examined in the past 40 years of research [28]. Moreover, with only very few exceptions, Spalax spp. displays a remarkable tolerance to chemically induced carcinogenesis in vivo, while its fibroblasts inhibit cancer growth in vitro [28, 30]. The naked mole rat H. glaber, similar to Spalax spp., shows adaptations to hypoxic stress and an in vitro ability to inhibit cancer cell growth [30].

The interpretation of these special phenotypic traits is hidden in certain regions of the genome. Genome sequencing of Spalax spp. and genome-transcriptome analysis have revealed interesting genomic features, which are potentially the basis of some of the observed adaptive traits [30]. Some of them include high rates of DNA editing (repair mechanism), reduced chromosomal rearrangements, adaptation to hypoxic/hypercapnic conditions by positive selection of respiratory proteins and reduced sensitivity to hypercapnia-induced acid pain [30].

Contrary to mammals, in which spontaneous neoplasia is present in many families, in wild amphibian populations it is extremely rare [31, 32] (Table 2). Amphibians, also, appear to be resistant to chemically induced malignant neoplasms [31]. A particular difference between amphibians and mammals may be the requirement of mammalian cells to enter the cell cycle before programmed cell death by apoptosis. On the other hand, amphibian cells have the ability to undergo apoptosis immediately in response to antigens that induce or, even, promote carcinogenesis. This feature could serve as a cytoprotective mechanism reducing the sensitivity or availability of cells that could be stimulated and become malignant [31]. More protective mechanisms and traits may be hidden in this group of taxa, like an important antimicrobial peptide family called dermaseptin that needs additional research. Dermaseptin-PH, which is a specific peptide derived from the skin secretion of a frog (Pithecopus hypochondrialis) specimen, exhibits a wide range of antimicrobial and anticancer activities [33]. However, any antimicrobial peptide is not necessarily an anticancer agent.

Conclusions

The necessity of understanding evolutionary mechanisms as driving forces matched with cancer as a potential result of natural selection, have triggered many scientists to search beyond humans clarifying the importance of vertebrate populations in this quest. A variety of vertebrate species have been reported over the years with neoplasia and despite the fact that the total number of recorded incidents seems to be low (Table 1), it is very important to focus on the following fact: the crushing majority of studied cases revealed some form of cancer, which became lethal while cases in which neoplasia has not been identified are only exceptions. Looking into the evolutionary perspective of cancer, much more attention should be focused on the past. The Mesozoic Era offers a plethora of neoplastic incidents, which may have a catalytic contribution to this endeavor. The rich fossil record contains important evidence for possible evolutionary paths and traits and many more are expected in the future if such a study is prioritized. Therefore, data from the fossil record should be utilized to unravel the conditions and/or pressures of the geo-chronological period, which may attribute to cancer its potential impacts on the formation and shaping-up of species.

The collected data tend to define cancer as a common phenomenon through the animal kingdom. However, there are cases in which specific taxa possess features capable of defending this pathogeny. Both mole rats cited above, Spalax spp. and Heterocephalus glaber [1, 25, 28, 30], show some remarkable tolerance and resistance to cancer due to specific genes in their genomes. Moreover, the low incidence of cancer in amphibians [31, 32] and the presence of some peptides with interesting properties [33] point out new research insights. These cases, among others, indicate the prospects for investigating the tumor suppressive mechanisms and cancer-resistant phenology in phylogenetically distal taxa. Their potential relationship with conserved elements in human genome and their significance in biomedical procedures should be addressed as holistically as possible.

Despite the growing interest of the scientific community towards the ecological and evolutionary background of neoplasia in wild populations, the list of relevant literature remains limited [6, 8]. To acquire safer and clearer ascertainments, it is essential to intensify these efforts since the benefits of studying wild population dynamics in their own habitats are multiple. This is expected to provide crucial evidence and answers to the very primary queries on the evolutionary nature of cancer while its effects on individual and population level disclose the onset of neoplastic phenomena through time, as major factors in the survival and shaping up of species.

Availability of data and materials

Not applicable.

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CVK performed searching of relevant literature and wrote the initial draft. ADB edited and proof read the manuscript. TJA, CVK and ADB had the initial idea, edited and proof read the manuscript. All authors read and approved the final manuscript.

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Correspondence to Theodore J. Abatzopoulos.

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Kitsoulis, C.V., Baxevanis, A.D. & Abatzopoulos, T.J. The occurrence of cancer in vertebrates: a mini review. J of Biol Res-Thessaloniki 27, 9 (2020). https://doi.org/10.1186/s40709-020-00119-0

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Keywords

  • Neoplasia
  • Cancer
  • Animal taxa
  • Vertebrates
  • Evolution
  • Phenotype
  • Speciation