CASK-related disorders: What to do next when your child has been diagnosed

Top resources for finding accurate medical information on CASK-related disorders

Resources written for the general public

• MedlinePlus: CASK-related intellectual disability
• National Organization for Rare Disorders (NORD) Rare Disease Database: CASK-related disorders
• CASK Gene Foundation: CASK-related disorders

Science-heavy resources targeted at clinicians:

• National Library of Medicine GeneReviews: CASK Disorders
• OMIM Online Catalog of Human Genes and Genetic Disorders:
  • INTELLECTUAL DEVELOPMENTAL DISORDER WITH MICROCEPHALY AND PONTINE AND CEREBELLAR HYPOPLASIA; MICPCH
  • INTELLECTUAL DEVELOPMENTAL DISORDER, X-LINKED, WITH OR WITHOUT NYSTAGMUS

Should I get a second opinion for a CASK-related disorder diagnosis?

Rare diseases require specialized expertise. Consider seeking a second opinion from a physician who focuses specifically on neurodevelopmental genetic conditions. A fresh perspective can confirm the diagnosis, reveal additional treatment options, or simply provide reassurance about your care plan.

For many rare diseases, it can be hard to find a specialist with relevant experience. You can try asking providers you have seen, referring to community resources (see Section 5 below), or consulting a genetic counselor.

What does a genetic counselor do when my family has received a CASK-related disorder diagnosis?

Certified Genetic Counselors have completed a program of study focused on understanding and providing information about genetic disorders. A genetic counselor can help you understand the genetic aspects of your child's diagnosis, what it means for your family, and whether testing is recommended for siblings or other relatives.

Genetic counseling can take place in person or in a telemedicine visit. The National Society of Genetic Counselors offers a tool for finding a genetic counselor.

Should other family members undergo genetic testing for CASK-related disorders?

CASK disorders are passed down through families in a pattern called X-linked inheritance, as the CASK gene is located on the X chromosome. Since girls typically have two X chromosomes and boys only have one, the disorder can affect individuals differently depending on their sex.

Whether other family members should be tested depends on which type of CASK disorder your child has: MICPCH or XLID.

MICPCH: In most cases, MICPCH is not inherited from a parent. It happens as a new ("de novo") genetic change in the child, and most parents do not carry the same change. However, there is a small chance that a parent carries the change in some of their cells (called mosaicism), meaning the chance of MICPCH occurring in a future pregnancy is low but slightly higher than for the general population. Testing of parents may be recommended to clarify the family's risk.

XLID (with or without nystagmus): XLID may arise from a new genetic change in the child, or may be inherited from a parent. A mother may carry the genetic change without having symptoms herself, and can pass it to her children. In this case, each pregnancy has a 50% chance of inheriting the variant, though children will likely be impacted differently based on their sex. A son who inherits the variant will likely show symptoms such as intellectual disability, while a daughter may have milder features.

Talking to a genetic counselor is the best way to understand what testing makes sense for your family. They can review your child's specific results, explain what it means for other family members, and walk you through your options in a way that fits your family's situation.

What is the expected progression of CASK-related disorders?

Every child is different, and the course of CASK-related disorders varies. Some general patterns to keep in mind:

• CASK disorders have historically been considered severe because early research focused on the most affected children. However, as more cases are identified, it is becoming clearer that many children show only some features of the condition, or may not be affected as severely.
• Skills such as sitting, communication, and social engagement may take time and significant support to develop, but many children make meaningful progress with early and consistent therapies.
• Regular monitoring by your child's care team can help, as some features may emerge or change over time.

What treatments are available for CASK-related disorders?

There is currently no cure for CASK-related disorders, but many treatments and therapies can meaningfully improve your child's quality of life and development. Depending on your child's symptoms, certain treatments may be recommended:

• Seizure management: Medications (anti-seizure drugs) are commonly used and can be effective. Your neurologist will guide treatment based on your child's seizure type and frequency.
• Physical therapy: Helps build strength, improve mobility, and support gross motor development.
• Occupational therapy: Supports fine motor skills, sensory processing, and daily living activities.
• Speech and language therapy: Addresses communication, including both verbal and non-verbal approaches, as well as feeding difficulties.
• Vision and hearing support: Glasses, hearing aids, or other interventions may be recommended based on your child's needs.
• Behavioral support: Can help with sleep, emotional regulation, and daily routines.

What healthcare providers should be on my child's care team?

Your child's care team is the group of providers who work together to support your child's health, development, and quality of life. CASK disorders affect multiple body systems, so your child's care team will likely extend well beyond a single doctor, and building it early matters, as waitlists for specialty and therapeutic services can be long.

Your team may include specialist physicians such as a neurologist (brain), ophthalmologist (eyes), audiologist (hearing), gastroenterologist (digestive system), or pulmonologist (lungs), as well as a geneticist who can help manage the complexity of a rare disease diagnosis.

Therapeutic providers, such as a physical therapist (mobility and motor skills), occupational therapist (daily living skills and fine motor development), speech-language pathologist (communication and feeding), or behavioral therapist (supporting emotional regulation and adaptive behavior), are equally important members, supporting your child's development, communication, and daily functioning.

Ask your doctor which providers make sense for your child's specific needs. For a deeper look at therapeutic services and how to access them, see Section 3.

Finding clinical trial opportunities & supporting research into CASK-related disorders

When you participate in research, you help your child and other families in the future. Medical research studies can be very different from each other. Some test new treatments, while others are "natural history studies" that just collect information about a disease's impact over time.

Clinical trials are research studies that help doctors find new treatments. Some trials test new medicines or therapies that aren't available yet. Even if you may choose not to participate, it can be good to know what options exist for CASK-related disorders. Your child's doctor or disease organization can help you find trials that might be a good fit. The U.S. government also maintains a registry at clinicaltrials.gov, where you can search "CASK" to see current trials underway or recruiting participants.

Natural history studies are designed to help researchers learn more about the condition. This information is important for creating future treatments. Traditional natural history studies can involve additional medical appointments over the course of several years. Citizen Health is partnering with Project Cask, Cask Gene Foundation, and CASK Warrior Foundation Inc. on a natural history study to accelerate research efforts for CASK disorders. Families can participate by securely sharing medical records you already have to help researchers better understand CASK disorders – no additional appointments needed. You can sign up here.

Patient registries collect health information from people with CASK-related disorders to help research move faster and connect families with clinical trials. Registries also show researchers and drug companies that families are engaged and want to help develop new treatments, which can bring more funding and research attention to a disease. There are multiple registries available to join for CASK disorders, run by Patient Advocacy Groups such as Project Cask and the Cask Gene Foundation (See Section 5 below to learn more about resources offered by these groups).

Gene therapy and targeted treatments aim to fix the underlying genetic cause of CASK-related disorders, rather than just managing symptoms. This is an area of active investigation. As of May 2026, two approaches are currently being pursued: gene replacement therapy, which would deliver a working copy of the CASK gene to affected cells, and X reactivation, a strategy that aims to switch on the healthy but silent backup copy of the CASK gene that exists in the cells of girls with CASK disorders. Both are in early preclinical stages, meaning researchers are still building the evidence needed to design a human clinical trial.

Organizing and maintaining your child's medical records for CASK-related disorders

Rare disease patients see many different doctors, often across different medical and technological systems that may not talk to each other. Unfortunately, that means the burden often falls on caregivers to track care holistically, identify "gaps," and make sure nothing gets missed. Keeping your records as organized and centralized as you can from early on is likely to improve your ability to manage your child's care down the road.

You can start by creating a one-page sheet with your child's diagnosis, current medications, allergies, and emergency contacts. Bring this sheet to every appointment. It can really help in emergencies or when you see a new doctor.

Many caregivers establish one (or several) records binder(s) in which they keep track of appointments, medication updates, symptoms, and other ongoing medically relevant information.

We also encourage caregivers to consider Citizen Health's free tools for centralizing, managing, accessing, and extracting key information from health records. Our system will collect all your health records, across doctors and health systems, making them available on our secure online platform that can provide answers in real time based on questions you ask (like "What medications has my child been prescribed in the past year?" or "When did we last see an orthopedist?")

As a company built by rare disease caregivers, we aim to overcome the need for physical records binders. But ultimately the important question is what works for you and your family.

3 & up: School services for children with CASK-related disorders

IEPs and 504 plans

When your child turns 3, they move from early intervention to school-based services. An Individualized Education Program (IEP) is a legal document that describes the special instruction, therapies, and support your child needs to learn at school.

A 504 plan provides accommodations for students who don't need special instruction but need support because of a disability. Understanding your rights and these plans helps make sure your child gets the right services throughout their school years.

Communicating with your school

Building a good relationship with your child's school team is important. You know your child better than anyone, and that knowledge is incredibly valuable. Come to meetings prepared with information about your child's needs, share your concerns and hopes openly, and never hesitate to ask questions if something isn't clear.

You are an equal and essential member of this team. Other members of your rare disease community can also be valuable resources for navigating your child's school experience.

Assistive devices and equipment for CASK-related disorders

Depending on your child's needs, assistive technology and adaptive equipment can help with independence, communication, and quality of life. This might include communication devices (Augmentative and Alternative Communication or AAC), which can be very impactful early on. Depending on muscle tone and motor development, your child may also benefit from mobility equipment as well as positioning and seating supports to help them stay comfortable and engaged throughout the day. Other common equipment may include seizure safety gear, adaptive toys and tools for play and self-care, and vision or hearing aids if those needs are present. Your therapists can recommend the right devices, and many are covered by insurance or available through school programs.

Some devices and equipment can be expensive but can very often be covered by insurance. If coverage is denied, be sure to talk to your doctors about writing an appeal letter or a Letter of Medical Necessity. These documents can be critical for getting insurance coverage for devices and equipment.

Respite care

Caring for a child with complex medical needs is hard work, and taking breaks is important for your health and your family's wellbeing. Respite care provides temporary relief, giving you time to rest, handle other responsibilities, or just recharge. Options range from a few hours with a trained caregiver to overnight or weekend programs.

Respite isn't a luxury. It's a necessary part of taking care of your family long-term. The non-profit Access to Respite Care and Help (ARCH) provides guidance on how to find a respite care provider.

Building your support systems as a CASK-related disorder caregiver

Being a caregiver to a child with CASK-related disorder is a heavy responsibility. You can't do it alone, and you don't have to. Building a network of support including family, friends, medical providers, therapists, other parents, and community resources, creates a safety net for hard days as well as people to celebrate victories with.

When asking for help, it helps to be specific: people want to support you but often don't know how. Whether it's meals, watching your other children, or just someone to listen, letting others help is good for everyone.

Don't forget about support for other family members! If your child has siblings check out the Sibling Support Project.

Understanding your insurance coverage for CASK-related disorders

What's covered

• Your insurance policy determines what services, therapies, equipment, and medications are covered for your child. Start by reading your plan documents to understand your benefits, deductibles, co-pays, and out-of-pocket maximums. Call your insurance company's customer service or case management department as many insurers assign case managers to children with complex medical needs who can help you understand your coverage.
• Don't assume something isn't covered until you've asked. Many families are surprised to learn what benefits are available when properly documented.
• Keep notes of every call you make, including the date, time, person you spoke with, and what they said. This documentation can be very helpful later.
• Most children's hospitals also have a financial counselor or patient navigator who may be able to help with insurance or financial coverage issues.

Therapy & rehabilitation

• When considering insurance coverage for therapies and rehabilitation services, make sure to see if your plan has a cap for the number of therapy visits per year. Many children with complex needs will exceed that cap and appeals or additional insurance coverage plans may be needed.

Medical equipment

• If your child needs durable medical equipment such as a wheelchair, walker, orthotics, or at home equipment, getting insurance coverage for that equipment will likely require prior authorization or a letter of medical necessity.

Gene therapy

• Gene therapy or disease targeted treatments may become available in the future. Gene therapies work by adding or changing a person's DNA, which is like the instruction manual for our bodies. These treatments aim to fix the cause of the particular condition by fixing the instructions for our bodies, rather than treating the downstream symptoms. Since this technology is newer, as therapies move from clinical trials to FDA approval, there can sometimes be challenges getting insurance to cover the treatments. Understanding how coverage works, what challenges exist, and how to advocate for approval is essential for families whose children may benefit from these groundbreaking treatments.

Denials & appeals

• Insurance companies often deny coverage for therapies, equipment, or medications at first but denials can often be overturned with the right documentation. If coverage is denied, you have the right to appeal, and many families win their appeals.
• An effective appeal letter includes: your child's diagnosis and how it affects their daily life, specific medical reasons from doctors explaining why the service or item is necessary, references to your insurance policy language that supports coverage, research or medical guidelines supporting the treatment, and a clear request for reconsideration. Many patient organizations and hospital financial counselors can help you write strong appeals. You can even appeal multiple times, and many families win on their second or third attempt. You're advocating for your child, and persistence often pays off.

Non-discrimination protections for CASK-related disorders

The Genetic Information Nondiscrimination Act (GINA) is a federal law that protects you from genetic discrimination in health insurance and employment. Health insurance companies cannot use genetic information to deny coverage, raise your premiums, or determine eligibility. However, GINA does not cover life insurance, disability insurance, or long-term care insurance. Employers cannot use genetic information when making hiring, firing, or promotion decisions. Understanding these protections can give you confidence in pursuing genetic testing and sharing results with your child's healthcare providers without fear.

Learn more about these protections from the American Society of Human Genetics.

Local CASK-related disorder support groups

Your genetic counselor or other healthcare provider may be able to connect you with local families in your area. It is totally appropriate to ask your providers if they know of any local families who might be willing to connect with you for a phone call or even a play date.

Some rare diseases are so exceptionally rare that it might not be possible to connect locally with another person with the same rare disease. But collectively, rare diseases are not that rare! Connecting with broader rare disease groups is another great option. Many states and communities have organizations that support all rare diseases.

Patient advocacy groups (PAGs) specific to CASK-related disorders

Patient advocacy groups exist for many rare diseases and serve as a central hub for connections, reliable information, research updates and advocacy efforts. These organizations work to advance research, improve care standards, raise awareness, and support families. They often host conferences, maintain family directories or registries, fund research, provide educational resources, and fight for policies that benefit the community.

Connecting with your disease's advocacy organization gives you access to experts, researchers, and a network of families while contributing to the larger mission of finding treatments and cures.

Citizen Health partners with CASK Gene Foundation, Project CASK, and CASK Warrior Foundation Inc., three of the leading patient advocacy organizations for CASK-related disorders.

• CASK Gene Foundation is a community-led organization focused on connecting CASK families, funding research, and maintaining the CASK Registry to advance understanding of the disorder.
• Project CASK is a parent-led nonprofit whose mission is to drive the scientific breakthroughs needed to treat and cure CASK gene disorders. Both organizations offer invaluable resources for newly diagnosed families and are active, welcoming communities so you don't have to navigate this journey alone.
• CASK Warrior Foundation Inc. is a nonprofit focused on boys affected by CASK gene disorder, dedicated to accelerating research and scientific collaboration.

Disease-specific conferences and events

Many patient advocacy groups will help spread awareness through conferences and events. These can include in person events or online events and are great opportunities to connect with others and to stay on the cutting edge of new research opportunities.

Attending a conference focused on your child's condition can be transformative. These gatherings bring together families, researchers, doctors, and advocates in one place. You'll hear about the latest research, learn from medical experts, meet families at different stages of the journey, and let your child connect with others like them.

Many families describe their first conference as the moment they felt less alone. While attending may require travel and expense, many organizations offer scholarships or financial assistance to help families participate. If you can go, it's often worth it.