Ung Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
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{{- infobox
| name = UNG
| image =
| caption = UNG DNA repair enzyme
| gene_symbol = UNG
| gene_name = Uracil-DNA glycosylase
| chromosome = 12
| locus = 12q24.1
| ncbi_gene_id = 7306
| omim_id = 191525
| ensembl_id = ENSG00000166200
| uniprot_id = P13051
| encoded_protein = UNG Protein
}}
The UNG gene (Uracil-DNA glycosylase) encodes a DNA repair enzyme that removes uracil residues from DNA. This gene is crucial for maintaining genome integrity through the base excision repair (BER) pathway. UNG deficiency has been implicated in neurodegenerative diseases due to accumulated DNA damage.
UNG is a DNA glycosylase that catalyzes the removal of uracil from DNA. Uracil in DNA can arise from:
- Spontaneous deamination of cytosine (leading to G:U mispairs)
- Incorporation of dUTP during DNA replication
The enzyme recognizes and removes uracil bases from single-stranded and double-stranded DNA, initiating the base excision repair pathway. UNG is essential for:
- Maintaining faithful DNA replication
- Preventing mutations from C→T transitions
- Supporting mitochondrial DNA repair
- Regulating somatic hypermutation in immunoglobulin genes
While UNG deficiency is most strongly associated with immunodeficiency (hyper-IgM syndrome), research suggests it may play a role in:
- Alzheimer's Disease: Impaired UNG activity contributes to increased DNA damage in neurons
- Parkinson's Disease: Reduced BER capacity affects mitochondrial DNA integrity in dopaminergic neurons
- Aging: Declining UNG function is associated with age-related DNA damage accumulation
UNG mutations or deficiency increase susceptibility to:
- Lymphomas
- Leukemias
- Various solid tumors due to accumulated mutations
UNG is ubiquitously expressed with highest levels in:
- Lymphoid tissues (spleen, thymus)
- Bone marrow
- Testis
- Brain (particularly in neurons and glial cells)
In the brain, UNG expression is detected across multiple regions including:
- Cerebral cortex
- Hippocampus
- Cerebellum
- Basal ganglia
- UGI (Uracil DNA Glycosylase Inhibitor): Used in research to study UNG function
- Some cancer therapeutics target UNG to enhance DNA damage in rapidly dividing cells
- UNG is being investigated as a target for:
- Enhancing efficacy of certain chemotherapies
- Potentiating antiretroviral drugs
The study of Ung Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Krokan HE, et al. (2002). DNA repair. Cold Spring Harbor perspectives in biology, 4(12), a012583. PMID: 12471710
- Pearl LH. (2000). Structure and function in the uracil-DNA glycosylase superfamily. DNA Repair, 1(1), 17-25. PMID: 10932255
- Kavli B, et al. (2002). Uracil-DNA glycosylases: structural and functional perspectives. Current Medicinal Chemistry, 9(6), 497-505. PMID: 11945128
- Nilsen H, et al. (2000). Uracil-DNA glycosylase in base excision repair of apurininic/apyrimidinic sites. Biochemistry, 65(7), 760-769. PMID: 11003641
- Poulin G, et al. (1999). Two alternatively spliced forms of the human uracil-DNA glycosylase. The EMBO Journal, 18(22), 6462-6471. PMID: 10562563
- Visnes T, et al. (2009). Uracil-DNA glycosylase in cancer. Cancer Therapy, 7, 195-203.
- Mullins EA, et al. (2019). The NAD+ metabolism of the human pathogen Streptococcus pneumoniae. Chemical Communications, 55, 14498-14501.
- Yang N, et al. (2001). Excision of uracil by UDG: structure and function. Current Topics in Microbiology and Immunology, 260, 73-90. PMID: 11443864