Systems approaches identify the consequences of monosomy in somatic human cells

Area of Science:

• Genetics
• Cancer Biology
• Molecular Biology

Background:

• Chromosome loss leading to monosomy is common in cancers but detrimental to cell viability.
• The mechanisms by which cancer cells survive monosomy remain largely unknown.

Purpose of the Study:

• To investigate how cancer cells survive monosomy.
• To understand the molecular and cellular consequences of monosomy in human cells.
• To explore the relationship between monosomy, p53, and ribosome biogenesis in cancer.

Main Methods:

• Utilized p53-deficient monosomic cell lines for experimentation.
• Performed transcriptome and proteome analysis to assess gene expression changes.
• Conducted pathway enrichment analysis to identify affected biological processes.
• Investigated protein synthesis and ribosome assembly in monosomic cells.

Main Results:

• Monosomy impairs cell proliferation and genomic stability.
• Reduced expression of genes on the affected chromosome was observed, with partial compensation in some cases.
• Monosomy globally alters gene expression, downregulating ribosome biogenesis and translation pathways.
• Monosomic cells exhibit defects in protein synthesis and ribosome assembly.
• Monosomy is incompatible with p53 expression, linked to ribosome biogenesis defects.

Conclusions:

• Impaired ribosome biogenesis and p53 inactivation are associated with monosomy in cancer.
• This study elucidates the detrimental effects of monosomy and highlights the critical role of p53 in its occurrence within cancer cells.