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Reviewed August 2013

What is the official name of the MFSD8 gene?

The official name of this gene is “major facilitator superfamily domain containing 8.”

MFSD8 is the gene's official symbol. The MFSD8 gene is also known by other names, listed below.

Read more about gene names and symbols on the About page.

What is the normal function of the MFSD8 gene?

The MFSD8 gene provides instructions for making a protein whose function is unknown. The MFSD8 protein is found in cell compartments called lysosomes, which digest and recycle different types of molecules. The MFSD8 protein belongs to a large group of related proteins called the major facilitator superfamily of secondary active transporter proteins. Proteins in this family move certain molecules between structures in cells or in and out of cells. While it is likely that the MFSD8 protein transports molecules, the specific molecules it moves are unknown. The MFSD8 protein probably transports substances across the membranes of lysosomes.

How are changes in the MFSD8 gene related to health conditions?

late-infantile neuronal ceroid lipofuscinosis - caused by mutations in the MFSD8 gene

More than 30 mutations in the MFSD8 gene have been found to cause late-infantile neuronal ceroid lipofuscinosis (NCL). This condition impairs motor and mental development beginning in early childhood, causing movement disorders and a decline in intellectual function. In addition, affected children often develop recurrent seizures (epilepsy) and vision impairment. The MFSD8 gene mutations that cause late-infantile NCL result in the production of a protein with decreased or altered function. In the Roma population of the Czech Republic, one MFSD8 gene mutation is responsible for almost all cases of late-infantile NCL. This mutation replaces the protein building block (amino acid) threonine with the amino acid lysine at position 294 in the MFSD8 protein (written as T294K).

Fatty substances called lipopigments accumulate in the lysosomes of people with late-infantile NCL. These accumulations can result in cell dysfunction and eventually cause cell death, especially in brain cells, which are particularly vulnerable to damage caused by lipopigments. However, it is unclear how mutations in the MFSD8 gene are involved in the buildup of lipopigments and the signs and symptoms of late-infantile NCL.

Where is the MFSD8 gene located?

Cytogenetic Location: 4q28.2

Molecular Location on chromosome 4: base pairs 127,917,805 to 127,965,984

(Homo sapiens Annotation Release 107, GRCh38.p2) (NCBIThis link leads to a site outside Genetics Home Reference.)

The MFSD8 gene is located on the long (q) arm of chromosome 4 at position 28.2.

The MFSD8 gene is located on the long (q) arm of chromosome 4 at position 28.2.

More precisely, the MFSD8 gene is located from base pair 127,917,805 to base pair 127,965,984 on chromosome 4.

See How do geneticists indicate the location of a gene? in the Handbook.

Where can I find additional information about MFSD8?

You and your healthcare professional may find the following resources about MFSD8 helpful.

You may also be interested in these resources, which are designed for genetics professionals and researchers.

What other names do people use for the MFSD8 gene or gene products?

  • ceroid-lipofuscinosis neuronal protein 7
  • CLN7
  • major facilitator superfamily domain-containing protein 8
  • MGC33302

Where can I find general information about genes?

The Handbook provides basic information about genetics in clear language.

These links provide additional genetics resources that may be useful.

What glossary definitions help with understanding MFSD8?

amino acid ; cell ; ceroid ; domain ; epilepsy ; gene ; lysine ; motor ; mutation ; population ; protein ; threonine

You may find definitions for these and many other terms in the Genetics Home Reference Glossary.

See also Understanding Medical Terminology.

References (5 links)


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? in the Handbook.

Reviewed: August 2013
Published: February 8, 2016