Peters Plus Syndrome: Causes, Symptoms & Management

Peters Plus syndrome is a rare genetic condition that affects the eyes, skeleton, face, and often several internal organs. It is caused by mutations in a single gene called B3GLCT (formerly known as B3GALTL), inherited in an autosomal recessive pattern, meaning a child must receive a faulty copy from each parent to develop the condition. Because it touches so many body systems at once, the syndrome can look different from one person to the next, and managing it requires coordination among multiple medical specialists.

The Genetic Root of the Syndrome

Peters Plus syndrome traces back to loss-of-function mutations in the B3GLCT gene. That gene provides the instructions for an enzyme whose job is to attach a glucose molecule to a specific sugar structure already sitting on certain proteins. Those proteins, which carry structures called thrombospondin type 1 repeats, play roles in cell signaling and tissue development throughout the body.¹ When the enzyme does not work, that sugar modification never happens, and the downstream effects ripple through multiple developing tissues, especially during fetal growth.

The condition is autosomal recessive, which means both parents are typically unaffected carriers who each carry one working copy and one broken copy of the gene. In families where both parents are carriers, each pregnancy carries a one-in-four chance of producing an affected child. Consanguinity, or parents being blood relatives, increases the odds that both carry the same mutation, and several reported families have had that history.²

One Mutation Accounts for Most Cases

Although researchers have identified several different mutations in B3GLCT, one particular splice-site change, labeled c.660+1G>A, dominates. In the largest mutation analysis of Peters Plus patients, that single variant accounted for about 75% of all disease-causing copies of the gene.³ Additional mutations have been found, but they are much rarer and likewise lead to a truncated, nonfunctional protein. In the landmark study that first linked the gene to the syndrome, researchers found biallelic truncating mutations in all 20 patients tested, confirming that Peters Plus is driven by this single gene.⁴

That genetic uniformity is both a scientific convenience and a clinical one. It makes molecular diagnosis relatively straightforward compared with syndromes caused by dozens of scattered mutations across large genes. When genetic testing finds two copies of the c.660+1G>A variant, the diagnosis is essentially confirmed.

There is a wrinkle, though. Some patients have a clinical picture that looks very much like Peters Plus syndrome but carry no detectable B3GLCT mutation. In one prenatal case, ultrasound and autopsy findings were consistent with the syndrome, yet microarray and gene analysis came back normal, leading clinicians to describe the presentation as “Peters Plus-like.”⁵ This suggests that other, still-unidentified genes may produce overlapping features, a reminder that clinical overlap between genetic conditions is common.

Eye Problems Are the Hallmark

The feature that usually draws attention first is Peters anomaly, a developmental defect of the front part of the eye. In Peters anomaly, the cornea (the clear window at the front of the eye) fails to develop normally, producing an opacity that can range from a faint haze to a dense, white scar. In Peters Plus syndrome, these opacities often have a characteristic pattern: a ring-shaped clouding around the center of the cornea with relative clearing in the middle, caused by abnormal attachments between the iris and the inner surface of the cornea.⁶ Not every eye follows that pattern, though. Some develop large, blood-vessel-filled central opacities instead, and the severity can differ between a patient’s two eyes.

One particularly severe case involved a premature infant whose corneas were so thin and compromised that perforation was suspected, requiring corneal transplants on both eyes within the first weeks of life. Tissue analysis showed that in one eye, all corneal layers except the surface epithelium were missing centrally, while the other eye lacked the inner lining and its supporting membrane.⁷ Cases like this illustrate the extreme end of the spectrum.

Glaucoma, a buildup of pressure inside the eye that damages the optic nerve, occurs in a substantial proportion of patients with Peters anomaly. Estimates suggest it affects somewhere between 30% and 70% of individuals, and up to half may have additional vision-threatening complications beyond the corneal opacity itself.⁸ Managing the eye problems early is critical, because in infants and young children, anything that blocks a clear image from reaching the retina can trigger amblyopia, a form of vision loss that becomes harder to reverse with age.

Skeletal and Growth Features

Short stature is one of the major features of Peters Plus syndrome, and it tends to be disproportionate, meaning the limbs are short relative to the trunk rather than the whole body being uniformly small.⁴ Prenatal growth restriction often shows up on ultrasound before birth, and after delivery children typically remain well below average height curves. Limb shortening can specifically be rhizomelic, affecting the upper parts of the arms and legs more than the lower parts.⁹

Brachydactyly, the medical term for unusually short fingers and toes, is another common finding. Hands and feet tend to appear broad.¹⁰ These skeletal differences are rarely painful or functionally disabling in themselves, but they can affect fine motor skills and dexterity, making occupational therapy helpful for some children as they learn to write, button clothes, or use tools.

Craniofacial Features

Children with Peters Plus syndrome often share a recognizable set of facial features. The most distinctive is a pronounced cupid’s bow shape to the upper lip, which clinicians familiar with the syndrome can spot quickly. Cleft lip and/or cleft palate occur frequently and can be unilateral or bilateral.¹⁰ A small or receding jaw (retrognathia) and closely spaced eyes (hypotelorism) have also been described in prenatal imaging.⁵

When a cleft is present, it needs to be addressed through the standard staged surgical approach used for cleft repair in any child, with input from a cleft lip and palate team that includes surgeons, speech therapists, and dentists. Feeding difficulties in infancy are common when a cleft palate is involved, and families often need early support from lactation specialists or specialized feeding equipment.

Brain and Developmental Involvement

Developmental delay and intellectual disability are part of the syndrome for many, though not all, affected individuals. The degree varies widely, from mild learning differences to more substantial cognitive impairment. Structural brain differences can accompany the developmental picture. In a study that screened fetuses with prenatally diagnosed hydrocephalus (excess fluid in the brain), a subset turned out to have Peters Plus syndrome, and the combination of hydrocephalus, absence of the corpus callosum (the band of nerve fibers connecting the brain’s two hemispheres), and cleft lip or palate was highlighted as a frequent cluster of findings in affected fetuses.¹¹

Not every child with Peters Plus syndrome has structural brain abnormalities, and the presence of hydrocephalus or corpus callosum agenesis does not by itself predict how a child’s cognition will develop. Still, when these features are detected prenatally or at birth, families should expect closer neurodevelopmental monitoring and early intervention services.

Heart, Kidney, and Other Organ Involvement

Peters Plus syndrome is not limited to the eyes, skeleton, and brain. Congenital heart defects show up in roughly 30% of cases. In one single-center study of 11 patients, four had cardiac findings including bicuspid aortic valve, atrial and ventricular septal defects, patent foramen ovale, and pulmonary stenosis.¹² Many of these heart defects are the same types seen commonly in the general population of children with congenital heart disease, and they are managed with standard cardiologic approaches ranging from monitoring to surgical repair depending on severity.

Genitourinary abnormalities have been reported in an estimated 10% to 19% of patients with Peters anomaly more broadly. These include conditions like hydronephrosis, kidney duplication, underdeveloped kidneys, and multicystic dysplastic kidneys.¹³ In at least one documented case, a patient was found to be missing a kidney entirely, a finding not previously reported in the literature.¹⁴ Reports like these keep expanding the recognized range of the syndrome, and they underscore why a thorough workup at diagnosis, including cardiac and renal imaging, matters even when a child’s presenting complaint is purely ocular.

Hearing loss, anal anomalies, and sacral agenesis have also been described in individual families, pushing the boundaries of the known clinical spectrum.¹³ With a condition this rare, every new case report has the potential to add a feature to the list.

How the Diagnosis Is Made

Diagnosis can happen at different points. Prenatally, certain ultrasound findings may raise suspicion. Intrauterine growth restriction combined with rhizomelic limb shortening, craniofacial anomalies, and central nervous system findings like mild ventriculomegaly can point toward the syndrome, but none of these findings is specific enough on its own to clinch the diagnosis.¹⁵ Family history helps: if a prior child was affected or the parents are known carriers, ultrasound findings carry much more weight.

Definitive prenatal diagnosis now relies on genetic testing. In a recent case involving a monochorionic diamniotic twin pregnancy, standard chromosome testing and microarray came back normal, but prenatal exome sequencing identified the homozygous c.660+1G>A splice-site variant in B3GLCT in both twins, confirming the diagnosis before birth.⁹ This type of extended genetic testing is becoming more accessible and is especially valuable for rare conditions where ultrasound alone cannot distinguish between several possible diagnoses.

After birth, the combination of Peters anomaly (visible on eye exam) with short stature, brachydactyly, and characteristic facial features usually prompts clinical suspicion. Genetic testing of B3GLCT confirms the diagnosis. Next-generation sequencing panels that cover multiple genes associated with anterior segment eye defects are often the first-line molecular test, with whole-exome sequencing available if initial panels are uninformative.¹²

Managing the Eyes

There is no way to fix the underlying genetic defect, so treatment focuses on managing individual symptoms. The eyes get the most urgent attention because the window for preventing amblyopia in infants is narrow. When corneal opacification is severe enough to block visual development in both eyes, penetrating keratoplasty (a full-thickness corneal transplant) is the primary surgical option.⁸ Pediatric corneal transplants are technically demanding and carry a higher rejection rate than adult transplants, but when the alternative is bilateral blindness, the risk-benefit calculation is clear.

In cases where the opacity does not cover the full visual axis, less invasive alternatives may preserve useful vision. Optical sector iridectomy (cutting a new opening in the iris to let light bypass the opacity), pharmacologic pupil dilation, and cornea rotation have all been used.⁸ In certain refractory cases, keratoprosthesis, an artificial cornea device, has been described with satisfactory outcomes. After any procedure, the postoperative goal is keeping the optical pathway clear and aggressively treating amblyopia through patching or other standard methods.

Glaucoma in these children requires its own management track, often involving pressure-lowering eye drops, laser treatment, or surgical drainage procedures. Monitoring needs to continue throughout life, because glaucoma in the setting of anterior segment dysgenesis can be difficult to control and may require multiple interventions over time.

Multidisciplinary Care Beyond the Eyes

Because Peters Plus syndrome touches so many systems, no single specialist can manage it alone. Recommended care involves ophthalmology for the eye anomalies, low-vision services when needed, orthopedics and physical therapy for skeletal issues, occupational therapy for fine motor challenges, educational support for developmental delays, a cleft lip and palate team when relevant, cardiology screening, renal imaging, and social services to help families plan for long-term needs including the transition from pediatric to adult care.¹⁶

For families, the practical reality is a lot of appointments. Coordinating care through a geneticist or a medical home model, where one provider keeps track of the big picture, can reduce the burden and prevent things from falling through the cracks. Early intervention programs for developmental delay are especially important, since children with visual impairment and cognitive differences benefit from structured support as early as possible.

What Prenatal Testing Means for Families

For couples who already have an affected child or who are known carriers, preimplantation genetic testing during in vitro fertilization or prenatal diagnosis through chorionic villus sampling or amniocentesis can identify whether a future pregnancy is affected. The dominance of the c.660+1G>A mutation makes targeted testing straightforward when the family’s mutation is already known.³

For pregnancies without a known family history, the syndrome is almost always unexpected. Ultrasound may show growth restriction and limb shortening, prompting broader genetic workup. The increasing availability of prenatal exome sequencing has improved the chances of reaching a diagnosis before birth even in these first-occurrence cases, though the technology is still not universally offered and can take weeks to return results. When a prenatal diagnosis is made, it gives families and their medical teams time to plan delivery at a center equipped to handle the eye, cardiac, and surgical needs the baby may have from day one.

How Variable the Syndrome Can Be

One of the most disorienting things for families reading about Peters Plus syndrome is the range of severity. Some individuals have relatively mild corneal clouding, near-normal stature, and only modest learning differences. Others have dense bilateral corneal opacities, severe short stature, structural brain abnormalities, heart defects, and kidney problems. Even siblings carrying identical mutations can differ in their clinical presentation, which means the genotype alone does not reliably predict how an individual child will be affected.

This variability likely reflects the role of modifier genes, environmental factors during fetal development, and the inherent randomness in how developmental programs unfold when a key enzyme is missing. For clinicians, it means every child needs a full individual assessment rather than assumptions based on a textbook description. For families, it means prognosis discussions early in life should be cautious and grounded in what the child actually shows, not in the most severe case reports in the literature.

The rarity of the condition, with probably only a few hundred cases described worldwide since it was first recognized, also means that the published literature skews toward more severe presentations. Milder cases may go undiagnosed or be attributed to isolated Peters anomaly without the “Plus” label, which could make the syndrome appear more uniformly severe than it actually is across the full population of affected individuals.

1
PubMed Central. Functional characterization of zebrafish orthologs of the human Beta 3-Glucosyltransferase B3GLCT gene mutated in Peters Plus Syndrome
2
BMJ Journals. Short stature, brachydactyly, and Peters’ anomaly (Peters’-plus syndrome): confirmation of autosomal recessive inheritance
3
PubMed Central. Mutation analysis of B3GALTL in Peters Plus syndrome
4
American Journal of Human Genetics. Peters Plus Syndrome Is Caused by Mutations in B3GALTL, a Putative Glycosyltransferase
5
PubMed Central. Prenatal detection of Peters plus-like syndrome
6
Cornea. Ocular Phenotype of Peters-Plus Syndrome
7
Cornea. Unique Presentation of Corneal Opacity in Peters Plus Syndrome
8
PubMed Central. General Treatment and Ophthalmic Management of Peters’ Anomaly
9
PubMed Central. Prenatal Diagnosis of Peters-Plus Syndrome: A Case Report
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PubMed. The Peters’ plus syndrome: a review
11
PubMed. Hydrocephalus, agenesis of the corpus callosum, and cleft lip/palate represent frequent associations in fetuses with Peters’ plus syndrome and B3GALTL mutations
12
PubMed Central. Diagnostic Utility of Next-Generation Sequencing-based CNV Analysis in Eleven Patients with Peters-Plus Syndrome: A Single-Center Experience
13
Egyptian Journal of Medical Human Genetics. Familial Peters Plus syndrome with absent anal canal, sacral agenesis and sensorineural hearing loss: Expanding the clinical spectrum
14
PubMed Central. Peters plus syndrome and absence of kidney: a case report
15
PubMed Central. Prenatal diagnosis of fetal peters’ plus syndrome: a case report
16
PubMed. Peters Plus Syndrome