Hypermethioninemia caused by deficient activity of methionine adenosyltransferase
10.3969/j.issn.1000-3606.2018.01.013
- VernacularTitle:甲硫氨酸腺苷转移酶活性缺陷致高甲硫氨酸血症3例报告
- Author:
Yanyan MA
1
;
Dongxiao LI
;
Xiyuan LI
;
Jingqing SONG
;
Yupeng LIU
;
Yuan DING
;
Yanling YANG
Author Information
1. 青海大学附属医院科研管理部、儿科 青海西宁 810001
- Keywords:
methionine;
methionine adenosyltransferase;
hypermethioninemia;
inherited metabolic disease
- From:
Journal of Clinical Pediatrics
2018;36(1):57-60
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the clinical and molecular genetic characteristics of hypermethioninemia caused by methionine adenosyltransferase deficiency. Methods The clinical data and related gene analysis of hypermethioninemia caused by methionine adenosyltransferase deficiency in 3 children were retrospectively analyzed. The core pedigree analysis was carried out. Results Three children (2 boys and 1 girl) aged from 5 months to 3 years, were from 3 unrelated families. All of them had no family history. One case was found in neonatal screening. One case was onset with pathological jaundice at 1 month old. Another case was found due to tremor and growth retardation at 2 years old. Blood amino acid ester acyl carnitine spectrum analysis showed that all of them had significantly elevated levels of methionine at 134.50-790.67 μmol/L. All children had MAT1A mutation in methionine adenosyltransferase gene. One case was heterozygous mutations with third exon c.274T>C and seventh exon c.895C>T mutation; one case had sixth exon c.757G>A homozygous mutation; and another case had seventh exon c.791G>A homozygous mutation. The core pedigree analysis showed that the mutations were from theirs parents respectively. Conclusions For children with neurologic impairment, methionine metabolic disorders should be considered. Blood amino acids and gene analysis are important methods for confirmation of the diagnosis. Neonatal screening is an effective way to detect this disease.
