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Karyotyping

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Meiosis I

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...

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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.

Genomic Imprinting and Inheritance

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...

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Case report: partial trisomy 4q27q35 syndrome.

S Arayici, V Topcu, G Kadioglu Simsek

Genetic Counseling (Geneva, Switzerland)

|March 26, 2015

Summary

This summary is machine-generated.

This study reports the first case of partial trisomy 4q27q35 in a newborn with Hirschsprung's disease. This rare chromosomal abnormality often causes developmental delays and distinct facial features.

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Area of Science:

Genetics
Developmental Biology
Pediatrics

Background:

Partial trisomy 4q is a rare chromosomal abnormality characterized by variable clinical manifestations.
Common features include growth delay, developmental delay, intellectual disability, and dysmorphic features.

Observation:

A newborn diagnosed with partial trisomy 4q27q35 was monitored in the neonatal intensive care unit.
The infant presented with Hirschsprung's disease, a congenital condition affecting the large intestine.

Findings:

This case represents the first documented instance of partial trisomy 4q27q35 co-occurring with Hirschsprung's disease.
The specific chromosomal region involved is 4q27q35.

Implications:

This report expands the understanding of phenotypic variability in partial trisomy 4q.
Highlights the importance of considering gastrointestinal anomalies, such as Hirschsprung's disease, in infants with this chromosomal abnormality.
Contributes to the literature on rare genetic disorders and their complex presentations.