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LYST
lysosomal trafficking regulator
The LYST gene provides instructions for producing the lysosomal trafficking regulator protein, which is critical for the proper function and movement of lysosomes within cells. The LYST gene is responsible for creating a protein involved in the transport of materials within cells, particularly to structures called lysosomes.
LYST is located on the long (q) arm of chromosome 1, at band 1q42.3. Arm ratio per GRCh38 - banding schematic.
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Overview
The LYST gene, also known as CHS1, codes for the lysosomal trafficking regulator protein. This protein is believed to play a critical role in how cellular materials are transported, particularly their movement towards and within lysosomes.
Lysosomes operate as the cell's recycling centres, utilising digestive enzymes to break down toxic substances, eliminate invading bacteria, and refurbish worn-out cellular components. While its precise mechanisms are still being fully elucidated, the LYST protein is integral to normal lysosomal function, potentially influencing their size and movement within the cell.
What the gene does
The LYST gene directs the synthesis of the lysosomal trafficking regulator protein, a crucial component for cellular housekeeping processes. This protein is thought to facilitate the transport or 'trafficking' of various substances into lysosomes. Lysosomes themselves are vital organelles that house digestive enzymes responsible for breaking down cellular waste, pathogens, and damaged cell parts.
Although the exact molecular role of the LYST protein remains an area of ongoing research, evidence suggests it contributes to determining the appropriate size of lysosomes and regulates their dynamic movement throughout the cell. Proper functioning of this protein ensures that lysosomes can efficiently perform their roles in cellular detoxification and recycling.
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Chromosome location
The LYST gene is located on the long arm of chromosome 1, specifically at position 1q42.3. This precise location indicates its physical address within the human genome, helping researchers understand its genetic context and how it might be inherited or interact with other genes.
Protein structure
The LYST protein is composed of 3801 amino acids and features a complex domain architecture. It includes several disordered regions, found at amino acids 148-173, 1181-1203, 1221-1256, and 2205-2224. Additionally, the protein contains multiple WD repeats, specifically WD 1 (amino acids 662-700), WD 2 (amino acids 1582-1626), WD 3 (amino acids 3563-3602), WD 4 (amino acids 3614-3653), WD 5 (amino acids 3656-3699), WD 6 (amino acids 3700-3744), and WD 7 (amino acids 3749-3788). Key functional domains include a BEACH-type PH domain (amino acids 3009-3115) and a larger BEACH domain (amino acids 3120-3422).
Key variants
Variants within the LYST gene can alter the function of the lysosomal trafficking regulator protein, impacting cellular processes. These genetic changes can range from small alterations in DNA building blocks to larger structural rearrangements. The specific impact of a variant often depends on its location within the gene and how it affects the protein's overall structure and function.
Sample of pathogenic variants
10 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.10643T>A | p.Leu3548Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.10883dup | p.Tyr3628Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.2016C>A | p.Tyr672Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.3996del | p.Asp1333fs | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.4433G>A | p.Trp1478Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.484C>T | p.Gln162Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.6077dup | p.Tyr2026Ter | Pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.8156C>G | p.Ser2719Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.8425G>T | p.Glu2809Ter | Pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
c.9219_9222del | p.Glu3074fs | Pathogenic/Likely pathogenic | ★★☆☆ | Chédiak-Higashi syndrome |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
Pathogenic variants in the LYST gene are associated with inherited conditions, primarily Chediak-Higashi syndrome and Chediak-Higashi-like (LYST). These conditions are typically inherited in an autosomal recessive manner. In Chediak-Higashi syndrome, LYST variants impair the normal function of the lysosomal trafficking regulator protein, leading to disruptions in the size, structure, and function of lysosomes and related cellular structures.
- Chediak-Higashi-like (LYST)
- Chediak-Higashi syndrome Dedicated page coming soon
Inheritance pattern
Conditions caused by pathogenic LYST variants typically follow autosomal recessive inheritance.
When both parents are carriers, each child has a 25% chance of being affected, 50% of being a carrier, and 25% of being unaffected.
UK clinical status
The LYST gene is assessed on several UK NHS national genomic testing panels, indicating its clinical relevance in the UK. It is included in panels such as Albinism or congenital nystagmus, Bleeding and platelet disorders, and Primary immunodeficiency or monogenic inflammatory bowel disease, among others. Its presence across these diverse panels highlights its role in a variety of complex health conditions.
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What is the primary role of the LYST gene?
The LYST gene provides instructions for making the lysosomal trafficking regulator protein, which is believed to be important for transporting materials into cellular structures called lysosomes. Lysosomes act as recycling centres, breaking down waste and foreign substances.
What condition is most commonly associated with LYST gene variants?
Variants in the LYST gene are most commonly associated with Chediak-Higashi syndrome. This condition affects the normal function of the lysosomal trafficking regulator protein, leading to problems with lysosome structure and function within cells.
How is Chediak-Higashi syndrome inherited?
Chediak-Higashi syndrome, linked to the LYST gene, is typically inherited in an autosomal recessive manner. This means an individual must inherit two copies of the altered gene (one from each parent) to develop the condition.
References
- Kaplan J, De Domenico I, Ward DM. Chediak-Higashi syndrome. Current opinion in hematology. 2008. PMID: 18043242
- Westbroek W, Adams D, Huizing M. Cellular defects in Chediak-Higashi syndrome correlate with the molecular genotype and clinical phenotype. The Journal of investigative dermatology. 2007. PMID: 17554367
- Karim MA, Suzuki K, Fukai K. Apparent genotype-phenotype correlation in childhood, adolescent, and adult Chediak-Higashi syndrome. American journal of medical genetics. 2002. PMID: 11857544
- Tchernev VT, Mansfield TA, Giot L. The Chediak-Higashi protein interacts with SNARE complex and signal transduction proteins. Molecular medicine (Cambridge, Mass.). 2002. PMID: 11984006
- Ward DM, Shiflett SL, Kaplan J. Chediak-Higashi syndrome: a clinical and molecular view of a rare lysosomal storage disorder. Current molecular medicine. 2002. PMID: 12125812
- Huizing M, Anikster Y, Gahl WA. Hermansky-Pudlak syndrome and Chediak-Higashi syndrome: disorders of vesicle formation and trafficking. Thrombosis and haemostasis. 2001. PMID: 11487012
- Introne W, Boissy RE, Gahl WA. Clinical, molecular, and cell biological aspects of Chediak-Higashi syndrome. Molecular genetics and metabolism. 1999. PMID: 10527680