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LMX1B gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

LMX1B gene

The LMX1B gene provides instructions for producing a transcription factor that is essential for the early development of the limbs, kidneys, and eyes.

Normal Function

The LMX1B gene provides instructions for producing a protein that attaches (binds) to specific regions of DNA and regulates the activity of other genes. On the basis of this role, the LMX1B protein is called a transcription factor. The LMX1B protein appears to be particularly important during early embryonic development of the limbs, kidneys, and eyes.

Health Conditions Related to Genetic Changes

Nail-patella syndrome

At least 145 mutations in the LMX1B gene have been found to cause nail-patella syndrome. Most mutations result in the production of an abnormally short, nonfunctional version of the LMX1B protein or change a single protein building block (amino acid). Mutations that substitute one amino acid for another amino acid reduce or eliminate the protein's ability to bind to DNA, disrupting the regulation of other genes during early development. Deletions of the entire LMX1B gene or large portions of the gene have also been shown to cause nail patella syndrome. It is unclear exactly how mutations in the LMX1B gene lead to the signs and symptoms of nail-patella syndrome.

Other Names for This Gene

  • LIM homeo box transcription factor 1, beta
  • LIM homeobox transcription factor 1, beta
  • LMX1.2
  • LMX1B_HUMAN
  • MGC138325
  • MGC142051
  • NPS1

Genomic Location

The LMX1B gene is found on chromosome 9.

Frequently Asked Questions

The mutation can lead to focal segmental glomerulosclerosis or other kidney abnormalities. Regular monitoring includes annual urinalysis for proteinuria, serum creatinine and estimated glomerular filtration rate (eGFR), and blood pressure checks. If proteinuria is detected, a nephrology referral and possibly a kidney biopsy may be warranted.
While the genetic defect cannot be reversed, early interventions can mitigate complications. Maintaining a healthy weight, avoiding high‑impact sports that stress the knees, and using orthotic devices can reduce joint pain. For kidney involvement, controlling blood pressure, limiting salt intake, and using ACE inhibitors or ARBs can slow progression. Regular ophthalmologic exams and early treatment of eye issues also improve quality of life.
Common early indicators include absent or under‑developed nails, especially on the thumbs and big toes, and mild knee joint abnormalities that may cause limping or a “patellar” deformity. Some children also exhibit mild eye changes or mild kidney issues that become apparent during routine pediatric check‑ups.
Targeted sequencing of the LMX1B gene is the standard test. If a pathogenic variant is found, a cascade testing approach can identify at‑risk relatives. For family planning, options include pre‑implantation genetic testing (PGT) with IVF, prenatal testing via chorionic villus sampling or amniocentesis, or natural conception with post‑natal screening. Discussing these options with a genetic counselor is essential.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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