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[Clinical characteristics and genetic analysis of a child with Galactosemia due to compound heterozygous variants of GALT gene].

Authors :
Xie Z
Liu J
Li X
Xiao M
Zhang Q
Zhang Z
Zhang Y
Li D
Source :
Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics [Zhonghua Yi Xue Yi Chuan Xue Za Zhi] 2023 Jul 10; Vol. 40 (7), pp. 842-846.
Publication Year :
2023

Abstract

Objective: To explore the clinical features and genetic basis of a child with Galactosemia.<br />Methods: A child who had presented at the Children's Hospital Affiliated to Zhengzhou University on November 20, 2019 was selected as the study subject. Clinical data of the child was collected. Whole exome sequencing was carried out for the child. Candidate variants were validated by Sanger sequencing.<br />Results: Clinical manifestations of the child have included anemia, feeding difficulty, jaundice, hypomyotonia, abnormal liver function and coagulation abnormality. Tandem mass spectrometry showed increased citrulline, methionine, ornithine and tyrosine. Urine organic acid analysis showed increased phenyllactic acid, 4-hydroxyphenylacetic acid, 4-hydroxyphenyllactic acid, 4-hydroxyphenylpyruvate and N-acetyltyrosine. Genetic testing revealed that the child has harbored compound heterozygous variants of the GALT gene, namely c.627T>A (p.Y209*) and c.370G>C (p.G124R), which were respectively inherited from her healthy parents. Among these, c.627T>A (p.Y209*) was known as a likely pathogenic variant, while c.370G>C (p. G124R) was unreported previously and also predicted as a likely pathogenic variant(PM1+PM2_Supporting+PP3_Moderate+PPR).<br />Conclusion: Above discovery has expanded the spectrum of the GALT gene variants underlying Galactosemia. Patients with thrombocytopenia, feeding difficulties, jaundice, abnormal liver function and coagulation abnormality without obvious causes should be analyzed by screening of metabolic diseases in combination with genetic testing.

Details

Language :
Chinese
ISSN :
1003-9406
Volume :
40
Issue :
7
Database :
MEDLINE
Journal :
Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics
Publication Type :
Academic Journal
Accession number :
37368387
Full Text :
https://doi.org/10.3760/cma.j.cn511374-20220518-00334