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The official name of this gene is “cirrhosis, autosomal recessive 1A (cirhin).”
CIRH1A is the gene's official symbol. The CIRH1A gene is also known by other names, listed below.
The CIRH1A gene provides instructions for making a protein called cirhin, whose precise function is unknown. This protein is found in many different tissues and organs. Within cells, cirhin is located in a structure called the nucleolus, which is a small region inside the nucleus where ribosomal RNA (rRNA) is produced. A chemical cousin of DNA, rRNA is a molecule that helps assemble protein building blocks (amino acids) into functioning proteins. Researchers believe that cirhin may play a role in processing rRNA.
Studies also suggest that cirhin interacts with other proteins, and it may function as part of a protein complex (a group of proteins that work together). The significance of these protein interactions is unknown.
The CIRH1A gene belongs to a family of genes called WDR (WD repeat domain containing).
A gene family is a group of genes that share important characteristics. Classifying individual genes into families helps researchers describe how genes are related to each other. For more information, see What are gene families? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genefamilies) in the Handbook.
At least one mutation in the CIRH1A gene has been found to cause North American Indian childhood cirrhosis, a chronic liver disease identified in a Native American population in Quebec. The known mutation replaces the amino acid arginine with the amino acid tryptophan at protein position 565 (written as Arg565Trp or R565W). This genetic change likely alters the structure and function of cirhin. However, it is unclear why the effects of the CIRH1A gene mutation are limited to the liver or how they cause the progressive liver damage characteristic of this disorder.
Cytogenetic Location: 16q22.1
Molecular Location on chromosome 16: base pairs 69,132,595 to 69,169,033
The CIRH1A gene is located on the long (q) arm of chromosome 16 at position 22.1.
More precisely, the CIRH1A gene is located from base pair 69,132,595 to base pair 69,169,033 on chromosome 16.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about CIRH1A helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
acids ; amino acid ; arginine ; autosomal ; autosomal recessive ; chronic ; cirrhosis ; DNA ; expressed ; gene ; molecule ; mutation ; nucleolus ; nucleus ; population ; protein ; recessive ; ribosomal RNA ; RNA ; testis ; tryptophan
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://www.ghr.nlm.nih.gov/glossary).
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.