[Identification of a novel pathogenic mutation in PDHA1 gene for pyruvate dehydrogenase complex deficiency].
OBJECTIVE
To study the molecular genetic mechanism and genetic diagnosis of pyruvate dehydrogenase complex deficiency (PHD), and to provide a basis for genetic counseling and prenatal genetic diagnosis of PHD.


METHODS
Polymerase chain reaction (PCR) was performed to amplify the 11 exons and exon junction of the PDHA1 gene from a child who was diagnosed with PHD based on clinical characteristics and laboratory examination results. The PCR products were sequenced to determine the mutation. An analysis of amino acid conservation and prediction of protein secondary and tertiary structure were performed using bioinformatic approaches to identify the pathogenicity of the novel mutation.


RESULTS
One novel duplication mutation, c.1111_1158dup48bp, was found in the exon 11 of the PDHA1 gene of the patient. No c.1111_1158dup48bp mutation was detected in the sequencing results from 50 normal controls. The results of protein secondary and tertiary structure prediction showed that the novel mutation c.1111 _1158dup48bp led to the duplication of 16 amino acids residues, serine371 to phenylalanine386, which induced a substantial change in protein secondary and tertiary structure. The conformational change was not detected in the normal controls.


CONCLUSIONS
The novel duplication mutation c.1111_1158dup48bp in the PDHA1 gene is not due to gene polymorphisms but a possible novel pathogenic mutation for PHD.
Department of Genetics and Endocrinology, Guangzhou Children and Women's Medical Center, Guangzhou 510623, China. liliuxia@hotmail.com.
Mo-Ling
ML
Wu
Li
L
Liu
Xiao-Jian
XJ
Mao
Min-Zhi
MZ
Peng
Hong-Sheng
HS
Liu
Hui-Ying
HY
Sheng
Yan-Na
YN
Cai
Hui-Fen
HF
Mei
Chun
C
Fan
Yong-Lan
YL
Huang
Xiu-Zhen
XZ
Li
Jing
J
Cheng
D000595:Amino Acid Sequence; D006801:Humans; D007223:Infant; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D011487:Protein Conformation; D030481:Pyruvate Dehydrogenase (Lipoamide) / Q000737:chemistry / Q000235:genetics*; D015325:Pyruvate Dehydrogenase Complex Deficiency Disease / Q000235:genetics*
D030481:Pyruvate Dehydrogenase (Lipoamide); C065640:pyruvate dehydrogenase E1alpha subunit