Methods for identifying heterozygous carriers of autosomal recessive diseases

a technology of autosomal recessive diseases and heterozygous carriers, applied in the field of dna microarray technology, can solve the problems of shortened lifespan, elevated risk of cancer, and inability to precisely identify the diagnostic assay, and achieve the effect of facilitating hybridization

Inactive Publication Date: 2005-08-25
CHEUNG VIVIAN G +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In accordance with the present invention, a novel method for identifying heterozygous carriers of autosomal recessive disorders is provided. The method comprises identifying a genetic signature for heterozygous carriers of autosomal recessive disorders by obtaining nucleic acid samples from cells of heterozygous carriers and normal individuals, generating detectably labeled probes from these nucleic acid samples, contacting cDNA microarrays with the detectably labeled probes under conditions that facilitate hybridization between complementary nucleic acids, analyzing the cDNA microarrays for cDNA hybrids, and comparing the hybridization profiles from the heterozygous carriers and normal individuals to generate a genetic signature. The genetic signature (consisting of a plurality of differentially expressed genes) differentiates carriers of an autosomal recessive disorder from normal controls.

Problems solved by technology

Although AT is a recessive disease, epidemiological studies have shown that AT carriers have shortened lifespans and elevated risks for cancer, especially breast cancer.
Despite the importance of detecting AT carriers, there is no precise diagnostic assay for identifying them.
ATM is a large gene (approximately 150 kb) and has no common mutations which makes it difficult to design sequence-based diagnostic methods for identifying carriers of AT (Gilad et al, 1996; Wright et al, 1996; Concannon & Gatti, 1997).
In addition, existing protein and cell-based assays are inaccurate for identifying heterozygous carriers, and are also time- and labor-intensive (Telatar et al, 1996).

Method used

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  • Methods for identifying heterozygous carriers of autosomal recessive diseases
  • Methods for identifying heterozygous carriers of autosomal recessive diseases
  • Methods for identifying heterozygous carriers of autosomal recessive diseases

Examples

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example 1

Expression Analysis Reveals Cellular Phenotype of Heterozygous Carriers of ATM Mutations

[0032] Using cDNA microarrays to monitor gene expression levels, it was determined that alterations in gene expression patterns differentiate heterozygous carriers of Ataxia Telangiectasia (AT) from normal individuals. The differences are manifested in both baseline expression levels and in response to ionizing radiation (IR). These findings provide a novel approach to diagnose AT carriers and may also facilitate an understanding of the molecular basis of their increased risk to cancer.

I. Materials and Methods:

[0033] The following protocols are provided to facilitate the practice of the present invention.

[0034] Baseline expression levels: Lymphoblastoid cell lines were obtained from 10 obligate AT carriers (GM08931, GM03334, GM03382, GM03188, GM09588, GM00736, GM02781, GM09585, GM09583, GM09579) and 10 normal control individuals (GM06995, GM06997, GM07014, GM10832, GM10835, GM10848, GM10849,...

example 2

Methods for Identifying Heterozygous Carrier of Autosomal Recessive Disorders

[0068] The method described in Example 1 for identifying AT carriers from normal individuals based on altered gene expression patterns may be adapted to identify heterozygous carriers of a variety of other autosomal recessive disorders including, but not limited to Cystic Fibrosis (CF), Sickle Cell Anemia, Tay-Sachs disease, Phenylketonuria (PKU), Oculocutaneous Albinism (OCA), Hereditary Haemochromatosis (HH), AAT deficiency, ADA deficiency, β-thalassemia, alpha-1 antitrypsin deficiency, Spinal Muscular Atrophy, Friedreich's Atoxia, and Congenital Adrenal Hyperplasia.

[0069] To identify heterozygous carriers of autosomal recessive disorders, cDNA microarrays may be used to examine the expression profiles of total RNA from lymphoblastoid cell lines of heterozygous carriers for any one of the autosomal recessive disorders which have been previously identified by conventional means and lymphoblastoid cell li...

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Abstract

Novel methods are provided for identifying heterozygous carriers of autosomal recessive disorders such as Ataxia telangiectasia.

Description

[0001] This application claims priority to U.S. Provisional Application 60 / 316,367 filed Aug. 31, 2001, the entire disclosure of which is incorporated by reference herein.[0002] Pursuant to 35 U.S.C. Section 202(c), it is acknowledged that the United States Government has certain rights in the invention described herein, which was made in part with funds from the National Institutes of Health, Grant Nos. DC00154, HGO1880, DK55227 and DK46618.FIELD OF THE INVENTION [0003] This invention relates generally to DNA microarray technology, and more specifically to methods for identifying heterozygous carriers of autosomal recessive diseases, Ataxia telangiectasia being exemplified herein. BACKGROUND OF THE INVENTION [0004] Several publications and patent are referenced in this application by author name and year of publication in parentheses in order to more fully describe the state of the art to which this invention pertains. Full citations for these references are found at the end of the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68C12Q1/6883
CPCC12Q2600/158C12Q1/6883
Inventor CHEUNG, VIVIAN G.SPIELMAN, RICHARD S.
Owner CHEUNG VIVIAN G
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