Genomic instability Archives - Laboratory Notes

Hutchinson–Gilford Progeria Syndrome

admin — Sat, 22 Aug 2026 17:38:44 +0000

Hutchinson–Gilford progeria syndrome is a rare genetic disorder caused by LMNA mutations that generate progerin, a toxic protein disrupting nuclear structure and accelerating ageing. Children develop rapid cardiovascular decline, growth failure and systemic tissue deterioration, making HGPS one of the most important models for understanding human ageing.

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Dyskeratosis Congenita

admin — Sat, 22 Aug 2026 16:52:52 +0000

Dyskeratosis congenita is a rare inherited telomere‑maintenance disorder caused by mutations in DKC1, TERT, TERC and POT1. Accelerated telomere shortening leads to premature cellular ageing, bone‑marrow failure, mucocutaneous abnormalities and multisystem disease. The condition provides key insight into how telomere biology shapes human ageing and tissue regeneration.

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Progeroid Syndromes

admin — Sat, 22 Aug 2026 16:44:18 +0000

Progeroid syndromes are rare genetic disorders that cause premature ageing due to defects in nuclear‑lamina structure, telomere maintenance and DNA‑repair pathways. Mutations in genes such as LMNA, WRN and TERT accelerate cellular decline, leading to early onset of ageing features and increased susceptibility to cardiovascular, metabolic and degenerative diseases.

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Retinoblastoma Protein (pRb)

admin — Wed, 19 Aug 2026 12:55:16 +0000

pRb is a major tumour‑suppressor that governs the G1–S transition by restraining E2F transcription factors and maintaining a repressive chromatin state. When pRb becomes hyperphosphorylated, cells commit to DNA replication. Loss of pRb function leads to uncontrolled proliferation, replication stress and genomic instability, making it a key player in cancer development.

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Ubiquitin–Proteasome System (UPS) in Cancer

admin — Tue, 18 Aug 2026 23:00:39 +0000

The ubiquitin–proteasome system (UPS) regulates protein turnover and controls cell‑cycle progression, DNA repair, apoptosis and oncogenic signalling. In cancer, UPS components become dysregulated, leading to excessive degradation of tumour suppressors and stabilisation of oncogenic proteins. This imbalance drives tumour growth and makes UPS a powerful therapeutic target.

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Genomic Instability

admin — Mon, 17 Aug 2026 06:21:08 +0000

Genomic instability describes the increased tendency of cells to accumulate genetic alterations due to failures in DNA repair, replication fidelity, and chromosome segregation. It plays a central role in cancer development, ageing, and hereditary disorders.

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SYCP2

admin — Wed, 12 Aug 2026 08:36:45 +0000

SYCP2 is a meiosis‑specific protein that forms the lateral elements of the synaptonemal complex. Its interaction with SYCP3 is essential for chromosome pairing, recombination, and fertility.

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SYCP1

admin — Wed, 12 Aug 2026 08:33:01 +0000

SYCP1 is a meiosis‑specific protein that forms the transverse filaments of the synaptonemal complex. Its correct assembly is essential for homologous chromosome pairing, recombination, and fertility.

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SYCP3

admin — Tue, 11 Aug 2026 14:52:39 +0000

SYCP3 is a meiosis‑specific protein essential for chromosomal synapsis and the formation of the synaptonemal complex. Mutations in SYCP3 are linked to meiotic arrest, infertility, and genomic instability.

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Synaptonemal Complex

admin — Tue, 11 Aug 2026 08:03:39 +0000

The synaptonemal complex is a meiosis‑specific protein structure essential for homologous chromosome pairing, recombination, and fertility. Its disruption leads to meiotic arrest, aneuploidy, and reproductive disorders.

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