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Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Sanders 3rd EditionCh. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization문제 B.11c
10장, 문제 B.11c

The most common reason a physician might recommend that a woman have maternal serum screening and a karyotype analysis is concern that her fetus may have Down syndrome. Go to the OMIM website at www.ncbi.nlm.nih.gov/omim and look up Down syndrome (OMIM 190685).
Summarize what is known about the location and genes found within the DSCR.

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Step 1: Understand the context of the problem by recognizing that Down syndrome is a genetic disorder caused primarily by trisomy of chromosome 21, and that the Down Syndrome Critical Region (DSCR) is a specific segment on chromosome 21 believed to contain genes contributing to the characteristic features of the syndrome.
Step 2: Visit the OMIM website at www.ncbi.nlm.nih.gov/omim and enter the OMIM number 190685 to access detailed information about Down syndrome, including genetic and molecular data.
Step 3: Locate the section or references within the OMIM entry that describe the DSCR, noting its chromosomal location on chromosome 21, typically within the region 21q22.1 to 21q22.3.
Step 4: Identify and list the key genes found within the DSCR as described in the OMIM entry, such as DYRK1A, DSCR1 (RCAN1), and others, and understand their proposed roles in the development of Down syndrome phenotypes.
Step 5: Summarize the information by explaining that the DSCR is a critical segment on chromosome 21 containing multiple genes whose overexpression due to trisomy contributes to the clinical features of Down syndrome.

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Down Syndrome Critical Region (DSCR)

The DSCR is a specific segment on chromosome 21 believed to contain key genes responsible for the characteristic features of Down syndrome. It is a focus for research because duplications in this region are linked to the syndrome's phenotypes, helping to pinpoint which genes contribute to developmental and cognitive effects.
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가이드 코스
09:31
Robertsonian Translocations

Maternal Serum Screening and Karyotype Analysis

Maternal serum screening tests measure specific proteins and hormones in a pregnant woman's blood to assess the risk of chromosomal abnormalities like Down syndrome. Karyotype analysis involves examining the fetus's chromosomes to detect trisomy 21, confirming the diagnosis by identifying an extra copy of chromosome 21.
추천 영상:
가이드 코스
03:38
Maternal Effect

Genes Located Within the DSCR

Several genes within the DSCR, such as DYRK1A, DSCR1, and APP, are implicated in Down syndrome. These genes influence brain development, cell signaling, and other biological processes, and their overexpression due to trisomy 21 contributes to the syndrome's clinical features.
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가이드 코스
11:19
Segmentation Genes
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교과서 질문

The most common reason a physician might recommend that a woman have maternal serum screening and a karyotype analysis is concern that her fetus may have Down syndrome. Go to the OMIM website at www.ncbi.nlm.nih.gov/omim and look up Down syndrome (OMIM 190685).

List the main symptoms of Down syndrome.

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교과서 질문

A researcher interested in studying a human gene on chromosome 21 and another gene on the X chromosome uses FISH probes to locate each gene. The chromosome 21 probe produces green fluorescent color, and the X chromosome probe produces red fluorescent color.

If the subject studied is male, how many green and red spots will be detected? Explain your answer.

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교과서 질문

In what way does position effect variegation (PEV) of Drosophila eye color indicate that chromatin state can affect gene transcription?

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교과서 질문

The most common reason a physician might recommend that a woman have maternal serum screening and a karyotype analysis is concern that her fetus may have Down syndrome. Go to the OMIM website at www.ncbi.nlm.nih.gov/omim and look up Down syndrome (OMIM 190685).

How might those genes lead to the main symptoms of Down syndrome?

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교과서 질문

A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):

Chromosome 1RNMDHBGKWU

Chromosome 2RNMDHBDHBGKWU

What term best describes this situation?

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교과서 질문

The most common reason a physician might recommend that a woman have maternal serum screening and a karyotype analysis is concern that her fetus may have Down syndrome. Go to the OMIM website at www.ncbi.nlm.nih.gov/omim and look up Down syndrome (OMIM 190685).

Look at the 'Mapping' and 'Molecular Genetics' sections and describe what is meant by the Down syndrome critical region (DSCR).

552
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