Related Experiment Video For ABCD1 gene

Updated: Jan 12, 2026

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations

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X-Linked Adrenoleukodystrophy in a Moroccan Patient: Genetic Diagnosis Leads to Presymptomatic Testing and Family

M Mansouri^1,2, T Smol³, N Louhabe⁴

¹Genetic department, Research Clinical Center, Mohammed VI University Hospital - Marrakech.

Balkan Journal of Medical Genetics : BJMG

|November 7, 2025

Abstract:

X-linked adrenoleukodystrophy (X-ALD) is a fatal neurodegenerative disorder caused by mutations in the adenosine triphosphate-binding cassette D1 (ABCD1) gene. In this study, we report the case of a Moroccan patient diagnosed with X-ALD due to a mutation in the ABCD1 gene. This diagnosis enabled a genetic counseling with presymptomatic analysis of the disease in the patient's brother, facilitating proactive management for the family. This work expands the clinical and genetic spectrum of XALD and underscores the critical role of presymptomatic testing in the management of neurodegenerative diseases.

Keywords:

ABCD1 gene X-linked adrenoleukodystrophy presymptomatic testing

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Sex-linked Disorders

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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.

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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...

Keywords:

ABCD1 gene X-linked adrenoleukodystrophy presymptomatic testing

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