ALTERACIONES CROMOSOMICAS PDF

Identificación de alteraciones cromosómicas en pacientes con esquizofrenia en la población cubana / Identification of chromosomal aberrations in Cuban. Download scientific diagram | Clasificación de las alteraciones cromosómicas numéricas. from publication: The utility of cytogenetics in modern medicine. Deleciones cromosómicas, a veces conocidas como monosomías parciales, tipos de pruebas genéticas que pueden identificar alteraciones cromosómicas.

Author: Vudor Kajiktilar
Country: Lithuania
Language: English (Spanish)
Genre: Art
Published (Last): 9 August 2013
Pages: 30
PDF File Size: 17.25 Mb
ePub File Size: 7.44 Mb
ISBN: 926-7-15607-987-9
Downloads: 56509
Price: Free* [*Free Regsitration Required]
Uploader: Vizilkree

GENETICA Y SEXOLOGIA INTEGRAL: ALTERACIONES CROMOSOMICAS EN CANCER

As a result, binding of the chimeric transcription factors to their target genes, which include genes required for normal myeloid differentiation, causes altteraciones transcriptional repression, thereby contributing to the accumulation of immature myeloid cells in acute myeloid leukemia. Jpn J Cancer Res ; Chromosomal imbalances can be categorized into genomic gains and genomic losses.

Insights into molecular mechanisms underlying the formation of chromosomal aberrations have been gained from studies of rare cancer-predisposing chromosomal instability syndromes, such as the inherited bone marrow failure syndromes, 2 in which genetic changes that are associated with the development of leukemia can be followed over time.

Effect of smoking habit on the frequency of micronuclei in human lymphocytes: Environ Mol Mutagen ; Second, the aberrant tyrosine kinase signaling in chronic myeloid leukemia led to the use of a selective tyrosine kinase inhibitor, imatinib mesylate, to treat the disease.

Genomic Gains Most recurrent genomic gains probably alteracioens to tumorigenesis by enhancing the activity of specific genes in the affected chromosomal regions. The production of micronuclei from chromosome aberrations in irradiated cultures of human lymphocytes.

The formation of a chimeric fusion gene results in the expression of a chimeric protein with new or altered activity. Origins of chromosome translocations in childhood leukaemia. There are several factors able to modify the number of micronuclei present in a given cell, among them are age, gender, vitamins, medical treatments, daily exposure to genotoxic agents, etc.

The Philadelphia chromosome is the result of a reciprocal translocation, t cromosomidas q The examples described here illustrate that many of these alterations are mediated by genetic changes associated with chromosomal abnormalities. One way to “filter” the genes within regions of DNA copy-number gain is to identify those that are also altered at the RNA or protein level, assuming that genes whose increased dosage translates into increased expression are most likely to be involved in malignant transformation.

  HISTORIA DE AMERICA LATINA LESLIE BETHELL TOMO 2 PDF

These two drugs are remarkably effective in acute promyelocytic leukemia. Chromosomal instability in amniocytes cromosomjcas fetuses of mothers who smoke. Genes Chromosomes Cancer ; Contributions to the development of a protocol suitable for regulatory submissions from an examination of 16 chemicals with different mechanisms of action and different levels of activity. Chromosomal rearrangements that entail aberrant transcriptional repression occur in a substantial proportion of patients with acute myeloid leukemia.

Functional Consequences of Balanced Chromosomal Rearrangements. In the majority of cases, only one of the two fusion genes generated and not the reciprocal counterpart indicated by the dashed arrows contributes to cancer pathogenesis.

Alteraciones Cromosomicas by alfredo castro on Prezi

Int J Cancer ; For instance, certain translocations that are associated with childhood leukemia arise in utero, years before the appearance of overt disease. Most recurrent genomic losses probably contribute to malignant transformation by reducing the function of specific genes in the affected chromosomal regions.

There is substantial evidence that these alterations are early or even initiating events in tumorigenesis. Contribution of sex, age, and lifestyle.

This abnormality is exemplified by the reciprocal translocations associated with Burkitt’s lymphoma, in which the enhancer of an immunoglobulin gene IGHG1, band 14q The position of the in vitro micronucleus test within the battery of screening for alterzciones potential determination and the regulatory guidelines.

Monoallelic deletions can completely inactivate tumor-suppressor genes that fromosomicas located on the X chromosome because humans carry only one functional copy of all X-linked genes.

Zalacain 1L. Panels A through C illustrate the functional consequences of different chromosomal rearrangements that result in the formation of a chimeric fusion gene.

  KENNETH OPPEL SILVERWING PDF

Rearrangements leading to the expression of a chimeric protein with constitutive tyrosine kinase activity in the absence of physiologic activating signals are represented by the translocation t 9;22 q Furthermore, the molecular characterization of cytogenetic abnormalities has provided insights into the mechanisms of tumorigenesis and alteeaciones, in a few instances, led to treatment that targets a specific genetic abnormality.

Genomic losses include monosomies and large-scale or submicroscopical deletions. Large-Scale Genomic Losses Extensive genomic deletions affecting multiple genes are frequent in tumors, making it difficult to identify which lost gene contributes alteraiones the development of the cancer.

There was a problem providing the content you requested

This article cromoomicas examples of two main classes of chromosomal abnormalities — balanced chromosomal rearrangements and chromosomal imbalances Figure 1 and Figure 2 — with particular focus on their functional consequences and their implications actual or potential for the development of effective anticancer therapies.

Cases of the myelodysplastic syndrome or acute myeloid leukemia arising in patients with Fanconi’s anemia, for example, typically have complex, unbalanced chromosomal abnormalities, which are thought to result from inactivation of components of the Fanconi’s anemia pathway that regulates the recognition and repair of damaged DNA.

The micronuclei assay is considered a practical, universally validated and technically feasible protocol which is useful to evaluate the genetic instability induced by genotoxic agents. Al contrario, varias publicaciones han detectado diferencias entre grupos de fumadores y no fumadores: Micronucleus cromosojicas of a floriculturist population from western Liguria, Italy.

The two main classes of chromosomal abnormalities found in human cancer are shown. Candidate genes from this region are then screened for deletions, mutations, or epigenetic modifications that inactivate the remaining allele. Structure of a Human Chromosome.

Author: admin