Related Experiment Video
Updated: Aug 1, 2025

07:42
Chromosome Preparation From Cultured Cells
Published on: January 28, 2014
81.5K
Alagille-like syndrome with surprising karyotype: a case report
S Amimoto1, M Ishii2, K Tanaka3
1Department of Obstetrics and Gynecology, University of Occupational and Environmental Health, Kitakyushu, Japan.
Journal of Medical Case Reports
|April 26, 2023
Summary
A preterm infant with a rare chromosomal abnormality was diagnosed with incomplete Alagille syndrome. This case suggests that genetic mutations beyond JAG1 and NOTCH2 may cause Alagille syndrome.
Area of Science:
- Genetics
- Pediatrics
- Medical Genetics
Background:
- Alagille syndrome is a multisystem disorder characterized by liver dysfunction, cardiac, skeletal, and ophthalmologic abnormalities.
- It is typically caused by mutations in JAG1 or NOTCH2 genes.
- Liver dysfunction is not a common symptom of chromosome 5p partial monosomy or 6p partial trisomy.
Related Concept Videos
Karyotyping
62.0K
Overview
62.0K
Nondisjunction
3.9K
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...
3.9K
Polytene Chromosomes
10.1K
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...
10.1K
Meiosis I
40.9K
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
40.9K

