Does Cartilage-Hair Hypoplasia Affect Male Fertility?

Cartilage-hair hypoplasia (CHH) can affect male fertility, though much of the existing research has focused on female reproductive health ^[1][2]. While women with CHH typically have normal fertility and reproductive hormones, men with the condition may experience issues that make it more difficult to have biological children naturally ^[1][2]. These challenges are linked to the underlying RMRP gene mutation that causes CHH, which can impair rapid cell division within the testicles and may lead to reduced sperm count or motility ^[3][4][5]. However, there are established family-building options available, including working with a specialist in assisted reproduction and a genetic counselor ^[6][7].

Understanding Male Fertility in CHH

The underlying cause of CHH is a mutation in the RMRP gene. This gene provides instructions for making an essential piece of cellular machinery that controls how cells divide and grow ^[3][8]. While this mutation primarily affects cartilage (leading to short stature) and hair growth, it also impacts other systems that require rapid cell turnover, including the immune system ^[3][8].

Because producing healthy sperm requires continuous and rapid cell division, the RMRP mutation can cause a direct, intrinsic defect in how sperm develops within the testicles ^[4][5]. This is considered a primary testicular issue. As a result, men with CHH may experience:

• Oligospermia: A low sperm count in the semen.
• Azoospermia: A complete absence of sperm in the semen.
• Poor sperm motility: Sperm that have difficulty swimming to reach and fertilize an egg.

(Note: If you have read elsewhere that “CHH” causes a brain signaling issue called “hypogonadotropic hypogonadism,” be aware that this refers to a completely different condition—Congenital Hypogonadotropic Hypogonadism—which confusingly shares the exact same acronym ^[9][10]. In Cartilage-Hair Hypoplasia, the brain signaling is typically normal, but the testicles themselves struggle to produce sperm efficiently ^[9][3].)

Options for Family Building

Because the fertility challenges in Cartilage-Hair Hypoplasia stem from a primary cellular defect within the testicles rather than a hormonal signaling issue, hormonal treatments like gonadotropin therapy are typically ineffective. Instead, you will need to work with a reproductive endocrinologist (a fertility specialist) to explore other options.

Potential pathways include:

• Assisted Reproductive Technology (ART): If sperm are present but in very low numbers or with poor motility, specialized techniques can be used. A common approach is Intracytoplasmic Sperm Injection (ICSI), where a single healthy sperm is selected and injected directly into an egg during In Vitro Fertilization (IVF) ^[11]. If there is no sperm in the semen, minor surgical procedures might be used to retrieve sperm directly from the testicles.
• Alternative Family Building: Depending on your individual sperm analysis and personal preferences, you may also choose to explore options like using donor sperm or adoption.

The Importance of Genetic Counseling

Because Cartilage-Hair Hypoplasia is an inherited condition with potentially life-threatening immune problems, genetic counseling is an essential step before attempting to conceive ^[12][7].

CHH is an autosomal recessive condition, meaning both parents must pass on a mutated RMRP gene for a child to have the disease ^[12][13]. If you have CHH, you will pass one mutated gene to your child ^[12].

• If your partner does not carry the mutation, your child will be a carrier but will generally not have the disease ^[12][7].
• If your partner is a carrier, there is a high risk of your child having CHH ^[12][7].

A genetic counselor will strongly recommend that your partner undergo carrier screening for the RMRP mutation ^[12][7]. If your partner is a carrier, you have the option of using Preimplantation Genetic Testing (PGT-M) during IVF to test embryos for the condition before pregnancy ^[6][7].

Looking Ahead

Navigating fertility with CHH requires coordination between multiple specialists. Because CHH involves the immune system, it is crucial to have your comprehensive health and immune function evaluated by your primary care team before starting any intensive fertility treatments ^[14][15]. By proactively getting a baseline semen analysis and meeting with a genetic counselor, you and your partner can safely map out the best path forward for your family planning goals.