Clinical Genetics

Genetics & Family Planning

At a Glance

Wolfram syndrome is usually inherited when a child receives two disease-causing variants, one from each parent, but some WFS1 variants act dominantly. Genetic counseling can clarify test results, family risk, and options such as PGT or prenatal diagnosis.

Wolfram syndrome is a genetic condition caused by changes (variants) in the instructions our cells use to function. Understanding how these changes are passed down can help you make sense of your diagnosis and plan for the future.

Classic Wolfram: The Recessive Pattern

Most cases of Wolfram syndrome follow an autosomal recessive inheritance pattern. This applies to both the WFS1 and CISD2 types ^[1]^[2].

In this pattern:

Two Copies Required: To have the classic syndrome, a person must inherit two disease-causing (pathogenic) copies of the gene—one from each parent ^[1]^[3].
The Role of Carriers: Parents of a child with the classic syndrome are usually carriers, meaning they have one healthy gene and one variant.
Recurrence Risk: When both parents are carriers of a pathogenic variant in the same gene, each pregnancy has:
- A 25% chance of the child inheriting two variants and having the recessive syndrome ^[1].
- A 50% chance of the child being a carrier like the parents ^[1].
- A 25% chance of the child inheriting two healthy genes ^[1].

If you already have recessive Wolfram syndrome and your partner is not a carrier, all of your children will inherit one of your variants and be carriers themselves, but they will generally not develop the classic recessive syndrome.

The WFS1 Spectrum: Dominant Disorders

Not all WFS1 variants follow the recessive rule. Some variants are dominant, meaning a person only needs one faulty copy of the gene to show symptoms ^[4]^[5]. These are often referred to as WFS1-related spectrum disorders ^[6].

These dominant forms are typically milder than classic Wolfram syndrome, but they can still be significant:

Hearing Loss: Some dominant variants cause only hearing loss, particularly at low frequencies ^[4]^[7].
Vision & Hearing: Other forms may cause vision and hearing loss but never lead to diabetes ^[8]^[9].
Dominant Recurrence Risk: If a person has a dominant WFS1 disorder, there is a 50% chance of passing the variant to each child.

Interpreting Your Genetic Test

Because the genetics of Wolfram syndrome can be complex, meeting with a genetic counselor is highly recommended ^[10]. Genetic reports can be confusing, and finding variants does not always immediately confirm the diagnosis.

Variants of Uncertain Significance (VUS): Sometimes labs find a change in the gene but don’t have enough data to know if it causes disease. A VUS alone does not confirm a diagnosis.
The “In Trans” Confirmation: For a recessive diagnosis, testing must confirm that you have two pathogenic variants and that they are “in trans” (meaning you inherited one from each parent, rather than both being on the same copy of the gene) ^[11]^[12]. Phasing them in trans is important, but only diagnostic if the variants are pathogenic.
Missing a Second Variant: If testing only finds one recessive variant but your symptoms strongly suggest Wolfram syndrome, your doctors may order more advanced testing (like deletion/duplication analysis or deep intronic sequencing) to look for a hidden second variant ^[13]^[14].

Family Planning Options

A genetic counselor can help discuss family planning options once the exact familial variants are identified. Pre-implantation genetic testing (PGT) or prenatal diagnosis can screen for the family’s specific pathogenic variants before or during a pregnancy, providing families with information to make personal choices ^[15]^[10].

Common questions in this guide

How is classic Wolfram syndrome passed down in families?

Classic Wolfram syndrome usually follows an autosomal recessive pattern, meaning a child inherits two disease-causing gene changes, one from each parent. When both parents carry a disease-causing change in the same gene, each pregnancy has a 25% chance of Wolfram syndrome, a 50% chance of carrier status, and a 25% chance of inheriting neither change.

Can one WFS1 variant cause Wolfram syndrome?

Some WFS1 variants act dominantly, so one altered copy of the gene can cause a WFS1-related spectrum disorder. These conditions may include hearing loss or vision and hearing problems without diabetes, and a person with a dominant variant has a 50% chance of passing it to each child.

What does a VUS mean on a Wolfram syndrome genetic test?

A variant of uncertain significance, or VUS, is a gene change that laboratories do not yet have enough evidence to classify as harmful or harmless. A VUS alone does not confirm a Wolfram syndrome diagnosis and should not usually guide major medical or family-planning decisions.

What does “in trans” mean in Wolfram syndrome testing?

“In trans” means that two gene changes are on separate copies of the gene, usually with one inherited from each parent. Confirming this arrangement can support a recessive diagnosis, but the changes must also be classified as pathogenic or likely pathogenic.

What happens if testing finds only one WFS1 variant?

If symptoms strongly suggest Wolfram syndrome, doctors may look for a second gene change that routine sequencing missed. Deletion or duplication testing and deep intronic sequencing are examples of additional tests a genetics team may consider.

What family-planning options are available for Wolfram syndrome?

Once the family’s disease-causing variants are known, a genetic counselor can discuss preimplantation genetic testing and prenatal diagnosis. These tests can provide information about whether an embryo or pregnancy has the familial variants, helping families make personal decisions.

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Curated prompts to bring to your next appointment.

1.Does my genetic report show 'biallelic' variants, and have we confirmed they are classified as pathogenic or likely pathogenic?
2.If I have only one WFS1 variant, is it a 'dominant' variant that could explain my symptoms, or am I a carrier?
3.Should we consider deletion/duplication or deep intronic testing if my initial WFS1 sequencing only found one variant?
4.Can we arrange targeted genetic testing for my relatives?
5.What are our options for pre-implantation genetic testing (PGT) if we are planning to have more children?

Key takeaways

Classic Wolfram syndrome usually follows an autosomal recessive pattern involving two pathogenic variants, one inherited from each parent.
When both parents carry a pathogenic variant in the same gene, each pregnancy has a 25% chance of Wolfram syndrome, a 50% chance of carrier status, and a 25% chance of inheriting neither variant.
Some WFS1 variants are dominant, so one variant can cause a WFS1-related spectrum disorder and gives a person a 50% chance of passing it to each child.
A variant of uncertain significance alone does not confirm Wolfram syndrome, and a recessive diagnosis requires confirmation that two pathogenic variants are in trans.
Genetic counseling can guide testing for relatives and family-planning options such as preimplantation genetic testing or prenatal diagnosis once the familial variants are known.

References (15)

1
Wolfram Syndrome Type I Case Report and Review-Focus on Early Diagnosis and Genetic Variants.
Jurca AD, Galea-Holhos LB, Jurca AA, et al.
Medicina (Kaunas, Lithuania) 2024; (60(7)) doi:10.3390/medicina60071064.
PMID: 39064493
2
A donor splice site mutation in CISD2 generates multiple truncated, non-functional isoforms in Wolfram syndrome type 2 patients.
Cattaneo M, La Sala L, Rondinelli M, et al.
BMC medical genetics 2017; (18(1)):147 doi:10.1186/s12881-017-0508-2.
PMID: 29237418
3
Homozygosity mapping and direct sequencing identify a novel pathogenic variant in the CISD2 gene in an Iranian Wolfram syndrome family.
Pourreza MR, Sobhani M, Rahimi A, et al.
Acta diabetologica 2020; (57(1)):81-87 doi:10.1007/s00592-019-01381-y.
PMID: 31309279
4
Natural history of patients with autosomal dominant WFS1 pathogenic variants associated with sensorineural hearing loss and optic atrophy.
Roberts JP, Tang AF, Hernandez D, et al.
medRxiv : the preprint server for health sciences 2025; doi:10.1101/2025.02.23.25322342.
PMID: 40061310
5
Dominant ER Stress-Inducing WFS1 Mutations Underlie a Genetic Syndrome of Neonatal/Infancy-Onset Diabetes, Congenital Sensorineural Deafness, and Congenital Cataracts.
De Franco E, Flanagan SE, Yagi T, et al.
Diabetes 2017; (66(7)):2044-2053 doi:10.2337/db16-1296.
PMID: 28468959
6
Delineating Wolfram-like syndrome: A systematic review and discussion of the WFS1-associated disease spectrum.
de Muijnck C, Brink JBT, Bergen AA, et al.
Survey of ophthalmology 2023; (68(4)):641-654 doi:10.1016/j.survophthal.2023.01.012.
PMID: 36764396
7
The Heterozygous p.A684V Variant in the WFS1 Gene Is a Mutational Hotspot Causing a Severe Hearing Loss Phenotype.
Otsuka S, Morimoto C, Nishio SY, et al.
Genes 2025; (16(1)) doi:10.3390/genes16010057.
PMID: 39858604
8
Natural history of 15 patients with autosomal dominant WFS1 pathogenic variants associated with sensorineural hearing loss and optic atrophy.
Roberts JP, Tang AF, Hernandez D, et al.
Orphanet journal of rare diseases 2026; (21(1)).
PMID: 42001184
9
WFS1-Associated Optic Neuropathy: Genotype-Phenotype Correlations and Disease Progression.
Majander A, Jurkute N, Burté F, et al.
American journal of ophthalmology 2022; (241()):9-27 doi:10.1016/j.ajo.2022.04.003.
PMID: 35469785
10
Consensus Recommendations for the Clinical Management of Wolfram syndrome Using a Delphi Method.
Elliott J, Ahmadi S, Yu-Wai-Man P, et al.
medRxiv : the preprint server for health sciences 2026; doi:10.64898/2026.07.02.26357130.
PMID: 42428113
11
Wolfram syndrome and diabetes mellitus in Aotearoa, New Zealand: Phenotype and response to GLP-1 receptor agonist therapy.
L'Amie A, Vincent AL, Jefferies CA, et al.
Diabetic medicine : a journal of the British Diabetic Association 2026; (43(8)):e70405 doi:10.1111/dme.70405.
PMID: 42324630
12
A novel heterozygous WFS1 variant of uncertain significance in a patient with early-onset diabetes: a case report.
Kan W, Wang Y, Xue Y, et al.
Frontiers in endocrinology 2025; (16()):1743282 doi:10.3389/fendo.2025.1743282.
PMID: 41613956
13
WFS1 Gene-associated Diabetes Phenotypes and Identification of a Founder Mutation in Southern India.
Chapla A, Johnson J, Korula S, et al.
The Journal of clinical endocrinology and metabolism 2022; (107(5)):1328-1336 doi:10.1210/clinem/dgac002.
PMID: 35018440
14
Comprehensive Genetic Analysis Unraveled the Missing Heritability in a Chinese Cohort With Wolfram Syndrome 1: Clinical and Genetic Findings.
Zhang X, Xie Y, Xu K, et al.
Investigative ophthalmology & visual science 2022; (63(10)):9 doi:10.1167/iovs.63.10.9.
PMID: 36098976
15
A novel WFS1 variant associated with severe diabetic retinopathy in Wolfram syndrome type 1.
Maamouri R, Hizem S, Kammoun I, et al.
Ophthalmic genetics 2023; (44(3)):304-312 doi:10.1080/13816810.2022.2113546.
PMID: 36094066

This page is for informational purposes only and does not constitute medical advice about Wolfram syndrome. A genetic counselor or your specialist can interpret your results and discuss family-planning options.

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