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1.
Nat Commun ; 10(1): 2884, 2019 06 28.
Artigo em Inglês | MEDLINE | ID: mdl-31253780

RESUMO

Hereditary retinal degenerations (HRDs) are Mendelian diseases characterized by progressive blindness and caused by ultra-rare mutations. In a genomic screen of 331 unrelated Japanese patients, we identify a disruptive Alu insertion and a nonsense variant (p.Arg1933*) in the ciliary gene RP1, neither of which are rare alleles in Japan. p.Arg1933* is almost polymorphic (frequency = 0.6%, amongst 12,000 individuals), does not cause disease in homozygosis or heterozygosis, and yet is significantly enriched in HRD patients (frequency = 2.1%, i.e., a 3.5-fold enrichment; p-value = 9.2 × 10-5). Familial co-segregation and association analyses show that p.Arg1933* can act as a Mendelian mutation in trans with the Alu insertion, but might also associate with disease in combination with two alleles in the EYS gene in a non-Mendelian pattern of heredity. Our results suggest that rare conditions such as HRDs can be paradoxically determined by relatively common variants, following a quasi-Mendelian model linking monogenic and complex inheritance.


Assuntos
Ciliopatias/genética , Proteínas do Olho/genética , Predisposição Genética para Doença , Doenças Retinianas/genética , Elementos Alu/genética , Grupo com Ancestrais do Continente Asiático/genética , Genômica , Humanos , Japão , Mutação , Linhagem
2.
Am J Hum Genet ; 101(4): 623-629, 2017 Oct 05.
Artigo em Inglês | MEDLINE | ID: mdl-28985496

RESUMO

In contrast to recessive conditions with biallelic inheritance, identification of dominant (monoallelic) mutations for Mendelian disorders is more difficult, because of the abundance of benign heterozygous variants that act as massive background noise (typically, in a 400:1 excess ratio). To reduce this overflow of false positives in next-generation sequencing (NGS) screens, we developed DOMINO, a tool assessing the likelihood for a gene to harbor dominant changes. Unlike commonly-used predictors of pathogenicity, DOMINO takes into consideration features that are the properties of genes, rather than of variants. It uses a machine-learning approach to extract discriminant information from a broad array of features (N = 432), including: genomic data, intra-, and interspecies conservation, gene expression, protein-protein interactions, protein structure, etc. DOMINO's iterative architecture includes a training process on 985 genes with well-established inheritance patterns for Mendelian conditions, and repeated cross-validation that optimizes its discriminant power. When validated on 99 newly-discovered genes with pathogenic mutations, the algorithm displays an excellent final performance, with an area under the curve (AUC) of 0.92. Furthermore, unsupervised analysis by DOMINO of real sets of NGS data from individuals with intellectual disability or epilepsy correctly recognizes known genes and predicts 9 new candidates, with very high confidence. In summary, DOMINO is a robust and reliable tool that can infer dominance of candidate genes with high sensitivity and specificity, making it a useful complement to any NGS pipeline dealing with the analysis of the morbid human genome.


Assuntos
Genes Dominantes , Doenças Genéticas Inatas/genética , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Aprendizado de Máquina , Mutação , Software , Bases de Dados Genéticas , Genoma Humano , Genômica , Humanos
3.
Am J Hum Genet ; 99(5): 1190-1198, 2016 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-27745836

RESUMO

Uveal melanoma (UM) is a rare intraocular tumor that, similar to cutaneous melanoma, originates from melanocytes. To gain insights into its genetics, we performed whole-genome sequencing at very deep coverage of tumor-control pairs in 33 samples (24 primary and 9 metastases). Genome-wide, the number of coding mutations was rather low (only 17 variants per tumor on average; range 7-28), thus radically different from cutaneous melanoma, where hundreds of exonic DNA insults are usually detected. Furthermore, no UV light-induced mutational signature was identified. Recurrent coding mutations were found in the known UM drivers GNAQ, GNA11, BAP1, EIF1AX, and SF3B1. Other genes, i.e., TP53BP1, CSMD1, TTC28, DLK2, and KTN1, were also found to harbor somatic mutations in more than one individual, possibly indicating a previously undescribed association with UM pathogenesis. De novo assembly of unmatched reads from non-coding DNA revealed peculiar copy-number variations defining specific UM subtypes, which in turn could be associated with metastatic transformation. Mutational-driven comparison with other tumor types showed that UM is very similar to pediatric tumors, characterized by very few somatic insults and, possibly, important epigenetic changes. Through the analysis of whole-genome sequencing data, our findings shed new light on the molecular genetics of uveal melanoma, delineating it as an atypical tumor of the adult for which somatic events other than mutations in exonic DNA shape its genetic landscape and define its metastatic potential.


Assuntos
Estudo de Associação Genômica Ampla , Melanoma/genética , Neoplasias Uveais/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos de Casos e Controles , Variações do Número de Cópias de DNA , Fator de Iniciação 1 em Eucariotos/genética , Fator de Iniciação 1 em Eucariotos/metabolismo , Éxons , Feminino , Subunidades alfa de Proteínas de Ligação ao GTP/genética , Subunidades alfa de Proteínas de Ligação ao GTP/metabolismo , Subunidades alfa Gq-G11 de Proteínas de Ligação ao GTP/genética , Subunidades alfa Gq-G11 de Proteínas de Ligação ao GTP/metabolismo , Humanos , Masculino , Melanócitos/patologia , Melanoma/diagnóstico , Proteínas de Membrana/genética , Proteínas de Membrana/metabolismo , Pessoa de Meia-Idade , Mutação , Fosfoproteínas/genética , Fosfoproteínas/metabolismo , Fatores de Processamento de RNA/genética , Fatores de Processamento de RNA/metabolismo , Neoplasias Cutâneas , Proteínas Supressoras de Tumor/genética , Proteínas Supressoras de Tumor/metabolismo , Proteína 1 de Ligação à Proteína Supressora de Tumor p53/genética , Proteína 1 de Ligação à Proteína Supressora de Tumor p53/metabolismo , Ubiquitina Tiolesterase/genética , Ubiquitina Tiolesterase/metabolismo , Ubiquitina-Proteína Ligases/genética , Ubiquitina-Proteína Ligases/metabolismo , Neoplasias Uveais/diagnóstico
4.
Am J Hum Genet ; 99(3): 770-776, 2016 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-27588451

RESUMO

Cone-rod degeneration (CRD) belongs to the disease spectrum of retinal degenerations, a group of hereditary disorders characterized by an extreme clinical and genetic heterogeneity. It mainly differentiates from other retinal dystrophies, and in particular from the more frequent disease retinitis pigmentosa, because cone photoreceptors degenerate at a higher rate than rod photoreceptors, causing severe deficiency of central vision. After exome analysis of a cohort of individuals with CRD, we identified biallelic mutations in the orphan gene CEP78 in three subjects from two families: one from Greece and another from Sweden. The Greek subject, from the island of Crete, was homozygous for the c.499+1G>T (IVS3+1G>T) mutation in intron 3. The Swedish subjects, two siblings, were compound heterozygotes for the nearby mutation c.499+5G>A (IVS3+5G>A) and for the frameshift-causing variant c.633delC (p.Trp212Glyfs(∗)18). In addition to CRD, these three individuals had hearing loss or hearing deficit. Immunostaining highlighted the presence of CEP78 in the inner segments of retinal photoreceptors, predominantly of cones, and at the base of the primary cilium of fibroblasts. Interaction studies also showed that CEP78 binds to FAM161A, another ciliary protein associated with retinal degeneration. Finally, analysis of skin fibroblasts derived from affected individuals revealed abnormal ciliary morphology, as compared to that of control cells. Altogether, our data strongly suggest that mutations in CEP78 cause a previously undescribed clinical entity of a ciliary nature characterized by blindness and deafness but clearly distinct from Usher syndrome, a condition for which visual impairment is due to retinitis pigmentosa.


Assuntos
Proteínas de Ciclo Celular/genética , Cílios/patologia , Distrofias de Cones e Bastonetes/complicações , Distrofias de Cones e Bastonetes/genética , Perda Auditiva Neurossensorial/genética , Perda Auditiva Neurossensorial/patologia , Mutação/genética , Idoso , Alelos , Animais , Cadáver , Proteínas de Ciclo Celular/metabolismo , Estudos de Coortes , Distrofias de Cones e Bastonetes/patologia , Distrofias de Cones e Bastonetes/fisiopatologia , Exoma/genética , Olho/embriologia , Olho/metabolismo , Proteínas do Olho/metabolismo , Feminino , Fibroblastos/patologia , Grécia , Perda Auditiva Neurossensorial/complicações , Perda Auditiva Neurossensorial/fisiopatologia , Heterozigoto , Homozigoto , Humanos , Íntrons/genética , Masculino , Camundongos , Pessoa de Meia-Idade , Linhagem , Ligação Proteica , RNA Mensageiro/análise , Suécia , Transcriptoma , Síndromes de Usher/patologia
5.
Anim Biotechnol ; 24(4): 268-77, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23947663

RESUMO

In this study we resequenced 1729 bp of the rabbit melanocortin 4 receptor (MC4 R) gene in 31 rabbits from different breeds/lines and identified ten polymorphisms: one was an indel and 9 were single nucleotide polymorphisms (SNPs). The indel and 5 SNPs were in the 5'-flanking region, 3 were synonymous SNPs and one was a missense mutation (c.101G>A; p.G34D), located in a conserved position of the extracellular tail of the MC4 R protein. The missense mutation was analyzed in a panel of 74 rabbits of different breeds and in 516 performance tested rabbits of a commercial paternal line under selection for growth efficiency. Association analysis indicated that rabbits with the less frequent genotype in this population (DD) had a lighter weight at 70 postnatal days than animals with genotype GD (P < 0.10) and animals with genotype GG (P < 0.05). This is the third study on candidate genes, after those on GH1 and IGF2 that reported a marker associated with finishing weight. Therefore, it seems that a candidate gene approach in rabbit based on previous information accumulated in other livestock species could be useful to identify genes explaining a fraction of variability of performance traits with potential application on rabbit breeding and selection.


Assuntos
Peso Corporal/genética , Carne , Mutação de Sentido Incorreto , Receptor Tipo 4 de Melanocortina/genética , Sequência de Aminoácidos , Animais , Simulação por Computador , Feminino , Gado/genética , Masculino , Anotação de Sequência Molecular , Dados de Sequência Molecular , Fenótipo , Polimorfismo de Nucleotídeo Único , Coelhos
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