Spontaneous chromosomal aberration levels in human peripheral lymphocytes

Area of Science:

• Cytogenetics
• Human genetics
• Environmental health

Background:

• Spontaneous structural chromosomal aberrations in human peripheral lymphocytes are indicators of genomic instability.
• Understanding baseline aberration rates is crucial for biomonitoring and risk assessment.

Purpose of the Study:

• To determine the spontaneous frequency of structural chromosomal aberrations in human peripheral lymphocytes.
• To investigate potential differences in aberration rates based on sex and age.

Main Methods:

• Cytogenetic analysis of metaphase spreads from peripheral lymphocytes of 49 female and 56 male subjects.
• Quantification of various aberration types including chromatid fragments, chromosome fragments, dicentrics, chromatid exchanges, and rings.
• Statistical comparison of aberration yields between different age groups and sexes.

Main Results:

• A total of 16,267 metaphase spreads were analyzed, revealing an overall spontaneous aberration rate of 1.17%.
• The most frequent aberrations were chromosome fragments (0.71%) and chromatid fragments (0.39%).
• Significant age-related differences in aberration yields were observed in females (20-29 vs. 60-70 years), but not in males (20-50 years).
• Significant sex-based differences were found in the frequencies of chromatid fragments, chromosome fragments, and overall aberrant cells.

Conclusions:

• Spontaneous chromosomal aberration rates in human lymphocytes vary with age, particularly in females.
• Sex is a significant factor influencing the frequency of specific chromosomal aberrations.
• These findings contribute to establishing baseline data for human biomonitoring studies.