Related Experiment Video
Updated: Jun 27, 2025
00:09
Semiconductor Sequencing for Preimplantation Genetic Testing for Aneuploidy
Published on: August 25, 2019
9.4K
Assessing autosomal aneuploidy in ancient genomes
1German Archaeological Institute, Division of Natural Sciences, Berlin, Germany.
Trends in Genetics : TIG
|April 25, 2024
Summary
Genetic analysis of ancient human remains reveals past aneuploidies, offering the sole reliable evidence of their historical presence. This breakthrough allows for exploring the history of rare diseases and the lives of affected individuals.
Area of Science:
- Paleogenetics
- Human Genetics
- Medical History
Background:
- Aneuploidies, or abnormal chromosome numbers, are historically challenging to study in ancient populations.
- Previous methods lacked the precision to reliably detect aneuploidies in ancient DNA.
Purpose of the Study:
- To establish a reliable method for detecting aneuploidies in ancient human remains.
- To enable the exploration of the historical prevalence and context of rare diseases.
Main Methods:
- Utilizing advanced genetic techniques on ancient human skeletal or soft tissues.
- Employing molecular assays to identify chromosomal abnormalities.
Main Results:
- Successfully detected aneuploidies in ancient human samples, confirming their past existence.
- Provided a foundation for investigating the historical trajectory of genetic disorders.
Conclusions:
- Genetic analysis of ancient remains is the only definitive method to ascertain past aneuploidies.
- This approach opens new avenues for understanding the social and historical dimensions of rare diseases.
Related Concept Videos
01:21Nondisjunction
3.8K
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
3.8K
01:17Karyotyping
60.1K
Overview
60.1K
02:45The Ratio of X Chromosome to Autosomes
8.5K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
8.5K
02:04Polytene Chromosomes
10.0K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
10.0K
01:11Genome-wide Association Studies-GWAS
13.4K
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
13.4K
02:32X and Y Chromosomes
25.9K
Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
25.9K