Glycosylation in Patients With Galactosaemia

Summary

Galactosaemia is an inherited condition caused by a lack of an enzyme (catalyst) which normally breaks down galactose (the sugar found in milk products). This affects 1:19,000 births annually in Ireland (the highest incidence worldwide) and is screened for by the National Newborn Screening Programme. When an affected infant is diagnosed, galactose is immediately restricted from the diet. This prevents often fatal liver disease and other immediate complications. However, despite early treatment the majority of affected patients go on to develop long-term complications such as intellectual impairment, neurological complications, speech difficulties and infertility in females. The underlying mechanisms for these complications are unclear. The investigators have shown in detailed biochemical and gene analysis studies that major abnormalities affecting the function of complex molecules in the body, particularly glycoproteins, (consisting of sugar chains attached to proteins) persist in treated individuals which may lead to disturbances of the body's intrinsic cellular machinery and relate to the complications seen.

In this research the investigators expand on from their earlier studies to see if they can identify biomarkers and parts of the galactose/glycosylation pathways which could be modified or changed with new treatments to improve outcomes for this condition (i.e., IgG N glycans).

In more detail, the investigators test the use of the most abundant glycoprotein in human plasma (IgG) as an improved clinical test for monitoring the galactose control needed in patients and also to see if some patients (including children aged 5-12 yrs) might have a better predicted outcome with moderate increases of galactose in the diet. The investigators believe that these studies greatly improve the understanding of Galactosaemia with a view to improving current treatment options and future outcomes.

Conditions

• Classical Galactosaemia

Interventions

OTHER

lactose-free diet

standard diet

DIETARY_SUPPLEMENT

Temporary oral galactose supplements

galactose supplements in the range of physiological galactose production

Sponsors & Collaborators

• Health Research Board, Ireland

  collaborator OTHER

• Medical Research Charities Group Ireland

  collaborator UNKNOWN

• University College Dublin

  collaborator OTHER

• Children's University Hospital, Ireland

  lead OTHER

Principal Investigators

• Eileen Treacy, MD, Prof · University Children's Hospital Dublin Irleland

Study Design

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

5 Years

Max Age

40 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2012-07-31

Primary Completion

2014-08-31

Completion

2014-08-31

Countries

• Ireland

Study Locations