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GENE AND PROTEIN SUMMARY

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Gene name

LIG4

Description

ligase IV, DNA, ATP-dependent

Protein class

Candidate cancer biomarkers, Enzymes, Mapped to UniProt SWISS-PROT

Protein evidence

High

Entrez gene summary

The protein encoded by this gene is a DNA ligase that joins single-strand breaks in a double-stranded polydeoxynucleotide in an ATP-dependent reaction. This protein is essential for V(D)J recombination and DNA double-strand break (DSB) repair through nonhomologous end joining (NHEJ). This protein forms a complex with the X-ray repair cross complementing protein 4 (XRCC4), and further interacts with the DNA-dependent protein kinase (DNA-PK). Both XRCC4 and DNA-PK are known to be required for NHEJ. The crystal structure of the complex formed by this protein and XRCC4 has been resolved. Defects in this gene are the cause of LIG4 syndrome. Alternatively spliced transcript variants encoding the same protein have been observed. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

3 in total
0 with predicted TM region
0 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Nucleus but not nucleoli, Plasma membrane, Cytoplasm

Additional location(s)

Focal Adhesions 

Staining summary

Staining of nucleus, cytoplasm and plasma membrane in all three cell lines with additional staining of focal adhesions in U-251 MG.

Reliability (Single)

Antibodies in assay

HPA001334
 

NORMAL TISSUE & ORGAN SUMMARY

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Staining summary

Most normal cells showed moderate to strong nuclear positivity.

Tissue specificity

Staining in 74 out of 74 cell types

Reliability (Single)

Antibodies in assay

HPA001334
 

Organ

No of cell types

Antibody staining

CNS (brain) 11
Hematopoietic (blood) 8
Liver and pancreas 5
Digestive (GI-tract) 11
Respiratory (lung) 3
Cardiovascular 1
Female tissues 11
Placenta 2
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 11
Endocrine tissues 3

Level of antibody staining





Strong
Moderate
Weak
Negative

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 87% of the cancers

Antibodies in assay

HPA001334
 

Tissue

Cancer staining

Normal tissue
staining

Breast cancer
 
Carcinoid
 
Cervical cancer
 
Colorectal cancer
 
 
Endometrial cancer
 
 
Glioma
 
Head and neck cancer
 
 
Liver cancer
 
 
Lung cancer
 
 
Lymphoma
 
 
 

Tissue

Cancer staining

Normal tissue
staining

Melanoma
 
Ovarian cancer
 
Pancreatic cancer
 
Prostate cancer
 
Renal cancer
 
Skin cancer
 
Stomach cancer
 
 
Testis cancer
 
Thyroid cancer
 
Urothelial cancer
 

Level of antibody staining





Strong
Moderate
Weak
Negative

CELL LINE SUMMARY

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RNA evidence

Medium
 

Cell line

Cell origin

RNA abundance

IH staining

IF intensity

HPA001334

HPA001334

A-431 Skin Medium
Strong
A-549 Lung Medium
CACO-2 Colon Medium
HEK 293 Embryonal kidney Medium
HeLa Cervix Medium
Hep-G2 Liver Low
MCF-7 Pleural effusion Medium
PC-3 Bone marrow Low
RT-4 Urinary bladder Medium
U-2 OS Bone Medium
Strong
U-251 MG Brain Medium
Strong

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

HPA001334 pAb