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Karyotyping

Karyotyping

Histone Variants at the Centromere

Histone Variants at the Centromere

Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...

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Related Experiment Video

Updated: May 9, 2026

Chromosome Preparation From Cultured Cells

Chromosome Preparation From Cultured Cells

Published on: January 28, 2014

Subjectivity in chromosome band-level estimation: a multicenter study.

Katherine B Geiersbach¹, Anna E Gardiner², Andrew Wilson²

¹1] Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA [2] Cytogenetics Laboratory, ARUP Laboratories, Salt Lake City, Utah, USA.

Genetics in Medicine : Official Journal of the American College of Medical Genetics

|July 27, 2013

Summary

For G-banded chromosome analysis, consistent use of a single band-level estimation method is key for quality control. This multicenter study found high correlation but also significant reader subjectivity, emphasizing method consistency over specific technique choice.

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Last Updated: May 9, 2026

Chromosome Preparation From Cultured Cells

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Published on: January 28, 2014

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Published on: February 3, 2012

Area of Science:

Cytogenetics
Genetics
Molecular Biology

Background:

Chromosome band level is a critical quality indicator in G-banded metaphase chromosome analysis.
Current guidelines specify minimum band levels for constitutional studies, but comparative performance of estimation methods is unstudied.

Purpose of the Study:

To compare the performance of five different band-level estimation methods.
To assess the impact of different methods on karyotype quality assessment.

Main Methods:

A multicenter study involving 82 readers from 7 laboratories.
Evaluation of 10 karyotypes (5 amniotic fluid, 5 peripheral blood) using five distinct band-level estimation methods (Stallard, Vancouver, Welborn, UK EQA Scheme, Ford).

Main Results:

High correlation (94%) observed among the five band-level estimation methods.
The Welborn method showed significantly lower scores for amniotic fluid karyotypes.
Reader subjectivity was high, with no clear correlation to experience or study center, except for one laboratory.

Conclusions:

Consistent application of a single band-level estimation method is more critical for karyotype quality monitoring than the specific method chosen.
Standardization of method selection is recommended for reliable G-banded chromosome analysis.