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A novel nonsense mutation in the tyrosinase gene is related to the albinism in a capuchin monkey (Sapajus apella)

BMC Genetics volume 18, Article number: 39 (2017) Cite this article

Abstract

Background

Oculocutaneous Albinism (OCA) is an autosomal recessive inherited condition that affects the pigmentation of eyes, hair and skin. The OCA phenotype may be caused by mutations in the tyrosinase gene (TYR), which expresses the tyrosinase enzyme and has an important role in the synthesis of melanin pigment. The aim of this study was to identify the genetic mutation responsible for the albinism in a captive capuchin monkey, and to describe the TYR gene of normal phenotype individuals. In addition, we identified the subject’s species.

Results

A homozygous nonsense mutation was identified in exon 1 of the TYR gene, with the substitution of a cytosine for a thymine nucleotide (C64T) at codon 22, leading to a premature stop codon (R22X) in the albino robust capuchin monkey. The albino and five non-albino robust capuchin monkeys were identified as Sapajus apella, based on phylogenetic analyses, pelage pattern and geographic provenance. One individual was identified as S. macrocephalus.

Conclusion

We conclude that the point mutation C64T in the TYR gene is responsible for the OCA1 albino phenotype in the capuchin monkey, classified as Sapajus apella.

Background

Albinism is a heterogeneous disorder, characterized by the absence or loss of melanin pigmentation in either skin, hair or eyes. This condition is considered rare in wild populations [1] possibly due to the reduction in camouflage [2, 3] and to its role in a number of pathologies that can compromise an animal’s fitness. Several pathological conditions are associated with albinism, such as immunological [4,5,6], auditory [7, 8] and visual deficiencies, e.g., nystagmus, absence of fovea, alteration of the optic chiasm decussation, reduction of rod density, photophobia, strabismus, iris transilumination and reduction of visual acuity [5, 9,10,11,12,13].

The biochemical pathway of melanin production is catalyzed by the tyrosinase enzyme, which is expressed by the tyrosinase gene (TYR) [14]. A deficiency in tyrosinase production leads to the total or partial absence of melanin, resulting in the Oculocutaneous Albinism Type 1 (OCA1) [15]. Cases of OCA1 caused by mutations in the TYR gene have been reported in several mammalian species, e.g., in rabbits [16], cattle [17], rats [18], cats [19], ferrets [20], whales [21] and buffalos [22]. Among primates a genetic mutation in the TYR gene was described in two unrelated individuals of rhesus monkey (Macaca mulatta), with phenotypes similar to human OCA1 [23]. Also in primates, a mutation in the SLC45A2 gene was indicated to cause the Type 4 Oculocutaneous Albinism (OCA4) phenotype in one specimen of gorilla (Gorilla gorilla) [24].

In this study, we investigated the genetic causes of albinism in a capuchin monkey, named Sivuca, held in the Experimental School for Primates (EEP), at the Universidade Federal do Pará (UFPA), Belém, Brazil. This adult male (Fig. 1) was found abandoned in the streets of Breves, an Amazon riverside town, handed in to the Brazilian Institute of Environment and Natural Resources (IBAMA), and transferred to the EEP, where it received medical treatment and is currently housed. Young wild animals are prized as exotic pets and are subject to animal trafficking. When these animals grow up into adults they can become dangerous and are often abandoned. Sivuca had his canine teeth filed down by the owners and his tail cut off, probably in a trap. Due to his albinism and history we cannot ascertain where he came from and he cannot be reintroduced into nature. However, Sivuca has adapted well to the captive housing conditions and provides us with an extremely valuable opportunity to identify albinism gene alteration in a species closely related to humans. Studies on different aspects of the albinism in other species, especially in primates, give us important insights into the mechanisms and development of albinism in humans. The description of the tyrosinase gene mutation may contribute to elucidate the underlying machinery of cell pigmentation and its influence on visual system development and the functioning of other systems affected by albinism. Thus, Sivuca represents a good model for a better understanding of this complex disorder.

Fig. 1
figure 1

The albino capuchin monkey Sivuca (left) and a normal phenotype capuchin monkey Smeagol (right), with the expected pelage pattern of Sapajus apella, at the Experimental School for Primates (EEP), Universidade Federal do Pará (UFPA), Belém, Brazil

Full size image

Capuchin monkeys are divided in two genera, the gracile (Cebus) and the robust capuchin (Sapajus) [25]. Species identification for capuchins demands careful morphological evaluation, information about provenance and molecular phylogenetic analysis [26]. The absence of regular fur coloration and lack of information on capture location makes it impossible to identify the species to which Sivuca belongs without molecular phylogenetic analysis. Thus, the objectives of this study were to identify the mutation responsible for the albino phenotype in the capuchin monkey Sivuca, and to describe the tyrosinase gene sequence of normal phenotype subjects from the same species. In addition we used molecular phylogenetic analysis for dentification of the subject’s species,

Methods

Samples

We analyzed the TYR coding region from genomic DNA using blood samples collected from the albino capuchin monkey (Fig. 1) and from six normal phenotype adult capuchin monkeys (five males and one female), held in the EEP and provisionally identified as Sapajus apella (see below). The animal procedures were in accordance with ethical principles of animal management and experimentation established by the Brazilian Animal Experiment College (COBAE), and the study was approved by the Ethical Committee of the UFPA (CEPAE/UFPA/#040–2015).

DNA extraction and PCR amplification for genetic sequencing

DNA extraction was performed using the Gentra Puregene Blood kit (Gentra Systems, Inc., Minneapolis, Minn., USA), according to the protocol supplied by the manufacturer. Each of the five exons of the TYR gene was amplified using the primers described in Table 1. Primers for exons 1 and 2 were obtained from Preising et al. [27], for amplifying human TYR gene. Primers for exons 3, 4 and 5 were designed on Primer 3 (v. 0.4.0) [28], based on the TYR sequence of the black-capped squirrel monkey Saimiri boliviensis (GenBank accession number XM_003935082.1). Polymerase Chain Reactions (PCRs) were carried out using High Fidelity Platinum Taq Polymerase, 10x High Fidelity Buffer, MgCl2 (Invitrogen), 10 mM GeneAmp dNTPs (Applied Biosystems, Inc.) and 20 mM primers in 50 μl reactions. The PCR conditions were an initial denaturation at 94 °C for 1 min; 37 cycles of 15 s at 94 °C, 30 s at the annealing temperature (Table 1) and 30 s at 72 °C; and a final extension at 72 °C for 7 min. PCR products were visualized by electrophoresis on agarose gel (1%) and purified with Illustra GFXTM PCR DNA and Gel Band Purification Kit (GE Healthcare, Little Chalfont, Buckinghamshire, UK). The PCR products were directly sequenced in both directions with BigDye® Terminator v3.1 Cycle Sequencing Kit (Applied Biosystems, Inc.) and the 3500 Applied Biosystems Sequencer. Nucleotide sequences were analyzed and aligned in BioEdit v7.0.9.0 [29], using ClustalW, and the alignment was visually confirmed.

Table 1 Primers used to amplify the TYR gene, the D-loop and Cytochrome b
Full size table

Phylogenetic approach for species classification

The capuchin monkey group includes two distinct genera, Sapajus and Cebus, [30], and species classification within each genus demands more than a simple morphological evaluation because of the highly polymorphic nature of within-species variation in capuchin monkeys [31, 32]. As the captive animals in the study are of unknown provenance, their species affiliation is uncertain. In order to determine the most likely geographic and species affiliation we amplified and sequenced the Cytochrome b and D-loop (GenBank accession numbers KY971495 and KY971496, respectively) regions of the mitochondrial DNA (as described above), using primers described in Table 1. We created an alignment using sequences from Lima et al. [33] that included samples from all currently recognized Sapajus species [32] and geographic subclades within species groups [33]. We aligned the sequences from these 63 samples of known species designation with Cytochrome b and D-loop sequences from the albino capuchin Sivuca and six other non-albino captive capuchins captured by IBAMA from nearby localities and housed at EEP, for a total of 70 capuchin samples. We aligned and concatenated the data set in Geneious Pro 5.3.4. In our D-loop alignment, we removed a small number of base pairs (bp) that were ambiguously aligned. Our final alignment consisted of a total of 586 bp of Cytochrome b and 585 bp of D-loop. We ran the dataset on Partition Finder v.1.1.1 [34] with linked branch lengths, all models, BIC for model selection, and greedy search parameters to determine the best-fit model of gene evolution for each partition. We recovered the best partitioning scheme as follows: CYTB 1st and 2nd codon positions as HKY + I, CYTB 3rd position as HKY, and D-loop as HKY + I + G. We subsequently ran a MrBayes 3.2 [35] Markov chain Monte Carlo (MCMC) analysis for 1,000,000 generations, with trees sampled every 1,000 generations. We discarded the first 25% of the data as burnin, and used ‘sumt’ to calculate the Bayesian consensus tree, visualized in Figtree v.1.4.0 (available from: http://tree.bio.ed.ac.uk/software/figtree/). GenBank Accession numbers for all sequences are available in Additional file 1. For final species classification the phylogenetic analysis results were compared with an evaluation of the pelage patterns of non-albino individuals [33].

Results and discussion

Species identification

The albino capuchin monkey Sivuca and five non-albino ‘normal’ phenotype captive individuals clustered in a clade with Sapajus apella and Sapajus libidinosus individuals (Fig. 2), with high posterior probability (pp = 1). This clade corresponds to “Sapajus CLADE 4, Subclade 2” in the extensive capuchin-wide phylogeny by Lima et al. [33]. This subclade includes both Sapajus libidinosus individuals from throughout the Caatinga and Cerrado habitats, as well as Eastern Sapajus apella from Tocantins and Tucuruí. Based on the genetic data, the pelage patterns for the non-albino individuals (Fig. 1) and the observation from EEP staff that the monkeys may have originated from the right bank of the Tocantins River, that marks the far eastern end of the distribution for Sapajus apella, we classify the genus and species [36, 37] of the albino and normal phenotype capuchin monkeys analyzed in this study as eastern Brazilian Sapajus apella. The exception is one individual (Tadinho), whose mtDNA sequence formed a clade instead with S. macrocephalus and S. apella individuals from “Sapajus CLADE 4, Subclade 5” [33], with high support (pp = 1) (Fig. 2). This is a northern clade of Amazonian Sapajus that spans the Amazon River and extends from northern Brazil to the Guianas.

Fig. 2
figure 2

Phylogenetic tree obtained from Bayesian analysis for Sapajus species, based on concatenated alignment of Cytochrome b and D-loop region of the mitochondrial DNA, of seven individuals housed at the Experimental School for Primates (EEP), at the Universidade Federal do Pará (UFPA), Belém, Brazil, including the albino Sivuca and 63 samples from currently recognized Sapajus species [42] and the geographic subclades within species groups [33]. Numbers at nodes represent Bayesian posterior probability. The scale bar represents the number of nucleotide substitutions per site

Full size image

Capuchin monkey tyrosinase gene

Most studied cases of albinism in human and other mammals are associated with mutations in the TYR gene and therefore, we focused our investigation on this gene in the albino capuchin monkey. This is the first study to describe the tyrosine gene in capuchin monkeys. The TYR coding sequence in mammals consists of five exons. We were able to partially amplify and sequence the five exons of the albino and the non-albino capuchin monkeys, with some gaps between the exon junctions (Additional file 2). No variation was observed among the TYR coding sequences analyzed of the six normal phenotype capuchins. The estimated TYR coding sequence had a total length of 1590 bp that together encode a 530 amino acid TYR protein. The length of the TYR coding sequence varies slightly among species, with 529 amino acids in humans and 530 in the rhesus monkey and the black-capped squirrel monkey (GenBank accession numbers: NM000372.4, XM_001105033.3 and XM_003935082.1, respectively). The TYR coding sequence of normal phenotype Sapajus apella capuchin monkey was deposited in GenBank database (KY990734).

Tyrosinase gene mutation

The TYR gene sequences from the albino and normal phenotype capuchin monkeys were aligned and analyzed to determine if there were polymorphisms in the gene sequences. We found no polymorphisms, except a homozygous C-to-T transition at position +64 within the first exon (Fig. 3), which leads to the conversion of an arginine codon (CGA) into a stop codon (TGA) in the albino primate only. This premature stop codon (R22X) produces a truncated TYR protein with only 22 amino acids and has not been described in other species. Notwithstanding, nonsense mutations in exon 1 have been described in human (W128X) [38], rhesus monkey (S184X) [23] and mink (C46X) [39], and all resulted in the OCA type 1 phenotype. Albinism was also associated with frameshift mutations in codon 316 in cattle [17] and at codon 325 in cats, which caused a premature stop codon nine codons downstream of the deletion [19].

Fig. 3
figure 3

Normal and mutant sequences of the TYR gene in the region of the R22X nonsense mutation of capuchin monkeys Sapajus apella

Full size image

Conclusions

We detected a nonsense mutation (C64T) in exon 1, which generated a premature stop codon (R22X) in the TYR gene of the albino capuchin monkey Sivuca. This mutation generates a truncated TYR protein, which is responsible for the OCA1 phenotype in this individual. Sivuca was classified as Sapajus apella, based on the phylogenetic reconstruction of the D-loop and Cytochrome b regions of mitochondrial DNA. Thus, this study provides the identification and description of a new nonsense mutation causing OCA1 albinism and describes the tyrosinase gene in normal phenotype capuchin monkeys, Sapajus apella.

Abbreviations

BIC:

Bayesian information criterion

EEP:

Experimental School for Primates

bp:

base pairs

MCMC:

Markov Chain Monte Carlo

OCA:

Oculocutaneous Albinism

pp:

posterior probability

TYR:

Tyrosinase

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Acknowledgments

The authors are grateful to Klena Sarges for animal care and blood extraction and to Cristina E. Sippli for experimental contribution.

Funding

This work was supported by the Foundation of Research Support in the State of São Paulo (FAPESP) with fellowships to EH (PhD 2010/51670-8; postdoc 2014/25743-9), DMOB (postdoc 2011/17423-6) and research grants to DFV (Projetos Temáticos 2008/58731-2; 2015/26818-2 and Projeto Regular 2009/06026-6), and by CNPq with fellowships to DMOB (Projeto Universal MCTI/CNPq n.14/2014 - 456746/2014-5). DFV is a CNPq 1 A Productivity Fellow.

Availability of data and materials

DNA sequences will be deposited into the GenBank® NIH genetic sequence database, and accessions numbers will be provided upon acceptance.

Authors’ contributions

FTGRV performed molecular genetic analyses, wrote the manuscript and conceived the study; LDH performed molecular genetic analyses; EH performed molecular genetic analyses and wrote the manuscript; JLA performed phylogenetic analyses; PRKG and OFG provided animal sample and behavioral data; GSS, LCLS, RYS and DFV helped in the experiment design; DMOB conceived the study and supervised project. All the authors discussed the results and contributed to the manuscript. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

The feeding, health, and management protocols, designed and supervised by a veterinary physician, were approved by the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA#207419; Unity Code/Agreement 381.201–4) and by the institutional Ethical Committee (CEPAE/UFPA/#040–2015). Blood collection and transportation was authorized by the Brazilian Institute of Biodiversity Conservation (ICMBio/SISBIO#32763-3/2015).

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Authors and Affiliations

  1. Departamento de Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, Av. Professor Mello Moraes 1721 Bloco A Sala D9 – Butantã, São Paulo, SP, Brazil, 05508-030

    Felipe Tadeu Galante Rocha de Vasconcelos, Einat Hauzman, Leonardo Dutra Henriques, Ronaldo Yuiti Sano, Dora Fix Ventura & Daniela Maria Oliveira Bonci

  2. Instituto Israelita de Ensino e Pesquisa Albert Einstein, Hospital Israelita Albert Einstein, São Paulo, São Paulo, Brazil

    Einat Hauzman, Dora Fix Ventura & Daniela Maria Oliveira Bonci

  3. Núcleo de Teoria e Pesquisa do Comportamento, Universidade Federal do Pará, Rua Augusto Corrêa, 01 - Guamá, Belém, PA, Brazil, 66075-110

    Paulo Roney Kilpp Goulart & Olavo de Faria Galvão

  4. Departamento de Oftalmologia, Santa Casa de Misericórdia de São Paulo, São Paulo, São Paulo, Brazil

    Ronaldo Yuiti Sano

  5. Instituto de Ciências Biológicas, Universidade Federal do Pará, Rua Augusto Corrêa, 01 - Guamá, Belém, PA, Brazil, 66075-110

    Givago da Silva Souza & Luis Carlos de Lima Silveira

  6. Núcleo de Medicina Tropical, Universidade Federal do Pará, Belém, Pará, Brazil

    Givago da Silva Souza & Luis Carlos de Lima Silveira

  7. Institute for Society and Genetics, University of California Los Angeles, Box 957221, 3360 LSB, Los Angeles, CA, USA, 90095-7221

    Jessica Lynch Alfaro

  8. Department of Anthropology, University of California Los Angeles, Los Angeles, CA, USA

    Jessica Lynch Alfaro

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  1. Felipe Tadeu Galante Rocha de Vasconcelos
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  2. Einat Hauzman
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  9. Luis Carlos de Lima Silveira
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Corresponding author

Correspondence to Daniela Maria Oliveira Bonci.

Additional files

Additional file 1:

GenBank accession numbers and geographic coordinates for robust capuchin samples from GenBank used in this study. (PDF 95 kb)

Additional file 2:

Alignment of the amino acid sequences of the TYR proteins of human (XM_011542970.2), rhesus monkey (XM001105033.3), marmoset (XM_002754705.2), squirrel monkey (XM_003935082.1) and the capuchin monkey. Identical residues are indicated by dots. The position of the nonsense mutation in the albino capuchin monkey, Sivuca, is shown by a star. (TIF 1166 kb)

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Galante Rocha de Vasconcelos, F.T., Hauzman, E., Dutra Henriques, L. et al. A novel nonsense mutation in the tyrosinase gene is related to the albinism in a capuchin monkey (Sapajus apella). BMC Genet 18, 39 (2017). https://doi.org/10.1186/s12863-017-0504-8

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  • DOI: https://doi.org/10.1186/s12863-017-0504-8

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BMC Genomic Data

ISSN: 2730-6844

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