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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Medical Genetics · SRP54 Deficiency

The Science of SRP54: Biology and Genetics

At a Glance

SRP54 deficiency is an autosomal dominant genetic condition in which faulty SRP54 protein delivery can stress cells and stop developing neutrophils in the bone marrow. Most cases arise de novo, and genetic testing helps confirm the diagnosis and distinguish similar disorders.

Understanding the biology of SRP54 deficiency requires looking deep inside your child’s cells. Every cell has a specialized “delivery service” responsible for moving newly made proteins to the correct location. In this condition, researchers have proposed that this delivery service is broken, creating a chain reaction of stress that specifically harms the bone marrow and the pancreas [1][2].

The Role of the SRP54 Gene

The SRP54 gene provides instructions for a protein that is part of the Signal Recognition Particle (SRP) [3]. Think of the SRP as a cellular “courier” with two main jobs:

  1. Cargo Recognition: It identifies new proteins as they are being built by the cell’s machinery [4].
  2. Delivery: It pauses the protein-building process and hauls the entire complex to the endoplasmic reticulum (ER)—the cell’s “protein-folding factory” [3][5].

Once at the ER, the SRP54 protein uses a chemical “key” called GTP to dock with a receptor and drop off its cargo so the protein can be finished and sent where it is needed [6][7].

What Happens When SRP54 is Mutated?

While the exact mechanisms are still being studied, experimental models suggest that when the SRP54 gene has a mutation, the courier service fails. The mutated protein might be unstable, or it might lose its “key,” meaning it cannot dock at the ER factory [7][8]. This is believed to lead to cellular problems:

  • ER Stress: Because proteins aren’t being delivered correctly, the ER factory becomes stressed [1][2].
  • Autophagy: The cell tries to clean up the mess by “eating” its own damaged parts (autophagy), which can lead to the cell’s death [1].
  • Maturation Arrest: Developing white blood cells (neutrophils) are particularly sensitive to this stress. As they try to grow in the bone marrow, they reach a point where they simply cannot continue. This established clinical finding is called maturation arrest, and it is why your child’s white blood cell count remains dangerously low [1][9].

Inheritance and Genetics

SRP54 deficiency is an autosomal dominant condition, meaning only one mutated copy of the gene is needed to cause the disorder [10]. In most documented cases, the mutation is de novo—it occurred spontaneously in the child and was not passed down from either parent [9][11]. However, genetic counseling is highly recommended, as a very small possibility of germline mosaicism exists, where a parent carries the mutation only in some of their reproductive cells.

Distinguishing SRP54 from Similar Conditions

Because the symptoms of SRP54 deficiency overlap with other rare diseases, doctors use precise genetic testing to identify a pathogenic variant (disease-causing mutation). This is often done through a neutropenia panel or Whole Exome Sequencing (WES) [12][13].

Doctors must distinguish it from several other types of Severe Congenital Neutropenia (SCN):

  • Shwachman-Diamond Syndrome (SDS): This is the most similar condition. However, SDS is usually caused by mutations in the SBDS gene and is an autosomal recessive condition [10][14].
  • ELANE-Related Neutropenia: This is a common cause of SCN but does not typically include the pancreatic or developmental issues seen in SRP54 [15].
  • HAX1 and G6PC3 Deficiencies: These are recessive conditions that often carry unique distinct clinical signs [16][17][18].

Identifying a pathogenic variant in the SRP54 gene helps confirm the diagnosis and guides targeted care, though doctors will still interpret this result alongside your child’s clinical picture to ensure no other conditions are present [7].

Common questions in this guide

What role does SRP54 play in a cell?
The SRP54 protein is part of a cellular delivery system that recognizes newly made proteins and directs them to the endoplasmic reticulum, where they are processed. A disease-causing variant may make this system unstable or prevent it from docking correctly, which can trigger cellular stress.
Why does SRP54 deficiency cause a very low neutrophil count?
Developing neutrophils in the bone marrow seem especially sensitive to the stress caused by faulty SRP54 function. Their development may stop at a stage called maturation arrest, leading to a persistently very low neutrophil count.
How can a child develop SRP54 deficiency if neither parent has it?
SRP54 deficiency is autosomal dominant, so one altered copy can cause it. Most documented variants are de novo, meaning they arise in the child rather than being inherited; rare germline mosaicism in a parent is why genetic counseling is recommended.
Which genetic tests are used to find SRP54 deficiency?
A doctor may order a neutropenia gene panel or whole exome sequencing to look for a disease-causing SRP54 variant. The result is interpreted with the child's clinical findings, blood counts, and bone marrow findings rather than used alone.
What does a pathogenic SRP54 variant mean compared with a VUS?
A pathogenic variant is a gene change with enough evidence to be considered disease-causing. A variant of uncertain significance, or VUS, does not yet have enough evidence to confirm or exclude SRP54 deficiency, so the care team must interpret it with the child's clinical findings.
How do doctors distinguish SRP54 deficiency from other severe congenital neutropenias?
Doctors compare the genetic result with the child's features and may test genes such as SBDS, ELANE, HAX1, and G6PC3. The inheritance pattern, bone marrow findings, and pancreatic or developmental problems can help distinguish SRP54 deficiency from other forms of severe congenital neutropenia.

Get notified when new evidence is published on Severe congenital neutropenia-developmental delay syndrome due to SRP54 deficiency.

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References

References (18)
  1. 1

    Mutations in the SRP54 gene cause severe congenital neutropenia as well as Shwachman-Diamond-like syndrome.

    Bellanné-Chantelot C, Schmaltz-Panneau B, Marty C, et al.

    Blood 2018; (132(12)):1318-1331 doi:10.1182/blood-2017-12-820308.

    PMID: 29914977
  2. 2

    SRP54 mutations induce congenital neutropenia via dominant-negative effects on XBP1 splicing.

    Schürch C, Schaefer T, Müller JS, et al.

    Blood 2021; (137(10)):1340-1352 doi:10.1182/blood.2020008115.

    PMID: 33227812
  3. 3

    Structure, dynamics and interactions of large SRP variants.

    Wild K, Becker MMM, Kempf G, Sinning I

    Biological chemistry 2019; (401(1)):63-80 doi:10.1515/hsz-2019-0282.

    PMID: 31408431
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    Signal-sequence induced conformational changes in the signal recognition particle.

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    Nature communications 2015; (6()):7163 doi:10.1038/ncomms8163.

    PMID: 26051119
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    Structure of a prehandover mammalian ribosomal SRP·SRP receptor targeting complex.

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    Science (New York, N.Y.) 2018; (360(6386)):323-327 doi:10.1126/science.aar7924.

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    GTPase cycle and ER membrane regulate cargo handover during cotranslational protein targeting.

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    Science advances 2026; (12(38)):eaeh8258 doi:10.1126/sciadv.aeh8258.

    PMID: 42758831
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    Structural and Functional Impact of SRP54 Mutations Causing Severe Congenital Neutropenia.

    Juaire KD, Lapouge K, Becker MMM, et al.

    Structure (London, England : 1993) 2021; (29(1)):15-28.e7 doi:10.1016/j.str.2020.09.008.

    PMID: 33053321
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    Receptor compaction and GTPase rearrangement drive SRP-mediated cotranslational protein translocation into the ER.

    Lee JH, Jomaa A, Chung S, et al.

    Science advances 2021; (7(21)) doi:10.1126/sciadv.abg0942.

    PMID: 34020957
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    Congenital neutropenia with variable clinical presentation in novel mutation of the SRP54 gene.

    Goldberg L, Simon AJ, Rechavi G, et al.

    Pediatric blood & cancer 2020; (67(6)):e28237 doi:10.1002/pbc.28237.

    PMID: 32277798
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    Mutations in signal recognition particle SRP54 cause syndromic neutropenia with Shwachman-Diamond-like features.

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    The Journal of clinical investigation 2017; (127(11)):4090-4103.

    PMID: 28972538
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    Severe congenital neutropenia, SRP54 pathogenicity, and a framework for surveillance.

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    A Next-Generation Sequencing Test for Severe Congenital Neutropenia: Utility in a Broader Clinicopathologic Spectrum of Disease.

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    Congenital neutropenia in the era of genomics: classification, diagnosis, and natural history.

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    Shwachman-Diamond syndromes: clinical, genetic, and biochemical insights from the rare variants.

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    Clinical relevance of SCN and CyN induced by ELANE mutations: a systematic review.

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    Novel G6PC3 Mutations in Patients with Congenital Neutropenia: Case Reports and Review of the Literature.

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This page explains the biology, inheritance, and genetic testing of SRP54 deficiency for informational purposes only and does not constitute medical advice. A pediatric hematologist, geneticist, and your child's care team should interpret genetic and bone marrow results.

Guide contents Severe congenital neutropenia-developmental delay syndrome due to SRP54 deficiency
Research & Literature
02 Symptoms, Warning Signs, and Emergency Care 04 Monitoring the Bone Marrow and Blood Counts