Objective To retrospectively analyze the screening results of phenylketonuria(PKU ) among 567 691 neonates in Gansu Province to understand the prevalence situation of PKU and provide the basic data for preventing and treating PKU in Gansu Province .Methods 567 691 samples of neonatal dried heel blood spots were collected by Gansu Province Newborn Screening Cen‐ter from 2009 to 2014 and the phenylalanine (Phe) level was quantitatively determined by the fluorescence quantification method . The identification was performed by using the urine pterine profile analysis and phenylalanine hydroxylase(PAH) gene mutation de‐tection .Results Among 567 691 neonates ,166 neonates were diagnosed as PKU ,the total detection rate was 1/3 420 ,in which 119 cases (71 .7% ) were classic PKU ,33 cases (19 .9% ) were moderate PKU and 14 cases (8 .4% ) were mild PKU .Conclusion The morbidity rate of PKU in Gansu Province is much higher than the national average incidence level ,which is dominated by classic PKU .Therefore Gansu Province should become the major area of PKU prevention and treatment .

Objective To explore the clinical manifestations and the deletion mutation in NEMO gene in incontinentia pigmenti. Methods The clinical manifestations of one neonatal infant were analyzed. By long PCR ampliifcation, the deletion mutations in NEMO gene and pseudogene ΔNEMO were detected. Results The clinical manifestations were typical skin lesions. Histopathological examination showed focal edema sponge and gathered or scattered eosinophilic granulocytes. The deletion of exons 4-10 in both NEMO andΔNEMO genes were detected in the patient. Conclusions Incontinentia pigmenti is a rare X chromosome linked dominant genetic disease. It has typical clinical manifestations and pathological changes, and deletion mutation in NEMO gene.

Objective To explore the value of prenatal genetical diagnosis by mutation analysis of achondroplasia (ACH) fibroblast growth factor receptor 3 (FGFR3) gene.Methods Genomic DNA from nine ACH patients and their parents in Gansu Maternal and Child Health Hospital from July,2010 to December,2014 was prepared for polymerase chain reaction.Direct sequencing revealed the samples were performed after amplification of exon 10 of FGFR3 containing the potential mutation.Fetal DNA was extracted from cells in both amniotic fluid and umbilical cord,and then exon 10 of FGFR3 was also tested.Three fetuses with short-limb dysplasia were also included and prenatal diagnosis was offered to them through amniocentesis or cordocentesis.Results Prenatal ultrasonography test showed shorter femoral length,which was less than 2-3 standard deviation of normal reference dysplasia fetal performance for femoral short.Femur length is lower than 2-3 standard deviation minus normal value,and discrepancy in biparietal diameter compared with fetuses at the same gestational age.In the four families with one ACH parent,c.1138G ＞ A heterozygous mutation was detected in all of the four mothers,while two fetuses among them showed c.1138G ＞ A heterozygous mutation mutation and the other two were normal.There were other two fetuses with c.1138G ＞ A heterozygous mutation from other two families,one's father had c.1138G ＞ A heterozygous mutations,but not the mother,the other had c.1138G ＞ A heterozygous mutations in both the mother and father.Among the three families with unaffected parents but each had a de novo c.1138G ＞ A mutation child,no mutation of c.1138G ＞ A genotype was detected in their fetuses,neither in the three fetus with short limb dysplasia.Four fetuses with a c.1138G ＞ A mutation and three with short-limb dysplasia were terminated.The other five fetuses whose genotype was normal were born and healthy with normal phenotype at one-year-old follow-up.Conclusion FGFR3 genetic analysis could provide information for genetic counseling and prenatal diagnosis for ACH parents or parents who had an ACH baby to prevent birth defect.

Objective To analyze clinicopathologic features of sebaceoma. Methods Clinical, pathologic and immunohistochemical findings from 31 cases of sebaceoma were retrospectively analyzed. The clinicopathologic features of sebaceoma were investigated. Results There were 9 males and 22 females. The patients′ age was 53.90 ± 15.40 years, and the clinical course was 9.41 ± 13.75 years. Sebaceoma predominantly affected the face. The common lesion of sebaceoma was red, yellowish?red, skin?colored or slight brown papules, with no subjective symptoms in most cases. Histopathologically, neoplasms had symmetric structures, and were located in the dermis. Epidermal involvements were found in 9 cases. The neoplasm cells were mainly composed of basaloid cells, a few mature sebocytes and some transition cells. The proportion of mature sebocyts was less than 1%in 26 cases, less than 20%in 2 cases, and 20%-40%in 3 cases. Mitoses were occasionally found in 5 cases. One patient was complicated by eccrine poroma. Varying amounts of ducts were found in all the patients. Immunohistochemical staining showed that epithelial membrane antigen was expressed on ducts and mature sebocytes in all the patients, while epithelial antigen was undetected in any of the patients. Carcinoembryonic antigen, androgen receptor and D2?40 were found in 20, 24 and 28 patients with sebaceoma, respectively. Conclusions The diagnosis of sebaceoma mainly depends on histopathological examination. Combined immunohistochemical detection of epithelial membrane antigen, androgen receptor and D2?40 is beneficial to its differential diagnosis.

Objective:To investigate the pathogenic gene locus and prenatal genetic diagnosis of 54 families with oculocutaneous albinism (OCA).Methods:This retrospective study enrolled 54 OCA probands and their families from Gansu Province Maternal and Child Health Care Hospital from May 2014 to May 2020. TYR gene variation screening was performed on the probands by Sanger sequencing. Those with negative results were analyzed by high-throughput sequencing, and further verification was performed on their parents by Sanger sequencing. Among the 54 families, 15 ml amniotic fluid were collected from 16 women at 18-21 gestational weeks in their subsequent pregnancy. Sanger sequencing combined with short tandem repeats sequence for linkage analysis were performed for genetic analysis. All data were analyzed using descriptive statistical analysis. Results:Out of the 54 OCA probands, 48 were diagnosed as OCA1, five were OCA2 and one was OCA4 based on the Sanger sequencing and high-throughput sequencing detection. A total of 26 different variation sites were involved in the 48 OCA1 probands, including 15 missense mutations, five nonsense mutations, three splicing mutations, and three frame-shift mutations, among which, c.929insC (29%, 28/96) was the most frequent mutation, followed by c.896G>A (11%, 11/96), c.832C>T (8%, 8/96) and c.703T>C (5%, 5/96). The diagnosis was confirmed in all 16 fetuses in the 16 families that underwent prenatal diagnosis. Five of them were affected and their mothers chose to terminate the pregnancies, the other 11 pregnancies continued to delivery, including seven heterozygous carriers and four fetuses without the same pathogenic allele as the proband. Maternal contamination was excluded in all prenatal samples using short tandem repeat for linkage analysis. All 11 children were in good health during telephone follow-up one month after birth. Postnatal validations were consistent with the prenatal tests.Conclusions:Genetic diagnosis could accurately identify various types of OCA and help to provide prenatal diagnosis and fertility consultation for subsequent pregnancies.

Objective To perform genetic analysis in a family line of a pregnant couple with autosomal reces-sive non-syndromic deafness in order to identify its possible genetic etiology and provide prenatal diagnosis.Methods Whole-exome sequencing(WES)was used to analyze the genes of the proband,and Sanger sequencing was used to verify the suspected pathogenic loci.Prenatal genetic diagnosis was performed after amniotic fluid collection at 18 weeks of pregnancy.Results Autosomal recessive deafness type 3 related gene MYO15A c.10419_10423delCAGCT/c.10294_10308delCCTTGCATCCTTGCC compound heterozygous variant was found in the wife.A compound heterozygous variant of autosomal recessive deafness type 77-related gene LOXHD1:c.6388C＞T/ex-on 33-38 del.Maternal MYO15A c.10294_10308del CCTTGCATCCTTGCC heterozygous variant were detected in the husband and paternal LOXHD1 exon 33-38 del heterozygous variant were detected in the fetus.At the same time,the paternal CDH23 c.6693delT heterozygous mutation and the maternal PCDH15 c.5048_5051dupAGAA heterozygous mutation were detected in the fetus.These two heterozygous mutations lead to the possibility of the fe-tus suffering from ID/F Usher syndrome.Conclusion The deafness of the couple is caused by two different deaf gene mutations,and the probability of the fetus having the same deafness as the couple is very low.However,the fetus has a high possibility of having deafness caused by two gene mutations.Therefore,deafness caused by two gene mutations should be paid attention to in the prenatal diagnosis of families with both deaf parents.

OBJECTIVE: To explore the genetic basis for a child with concomitant spinal muscular atrophy (SMA) and Citrin protein deficiency. METHODS: The child was subjected to whole exome sequencing by using target sequence capture high-throughput sequencing. Candidate variants were verified by Sanger sequencing. The SMN genes of the patient were also analyzed through multiplex ligation-dependent probe amplification (MLPA). RESULTS: The patient was found to carry homozygous deletion of exons 7 and 8 of the SMN1 gene, for which his parents were both carriers. The patient also carried compound heterozygous variants c.1737G>A and IVS16ins3kbof the SLA25A13 gene, in addition with compound heterozygous variants c.948G>A and c.2693T>C of the POLG gene, for which his parents were carriers, too. CONCLUSION Variants of the SLC25A13 gene probably underlay the deficiency of Citrin protein, which may lead to neonatal intrahepatic cholestasis (NICCD). The patient also had SMA. The compound heterozygous variants c.948G>A and c.2693T>C of the POLG gene are likely to cause mitochondrial DNA deletion syndrome type 4A, though other types of mitochondrial disease cannot be excluded.

OBJECTIVE: To carry out genetic analysis for 21 patients with methylmalonic acidemia (MMA) and provide genetic counseling for their families. METHODS: Next generation sequencing (panel) was used to detect the pathogenic variants underlying the disease. RESULTS: In total 29 variant sites of MMUT, MMAA, MMUT were identified in the 21 patients, with common variants including c.323G>A (10%), c.917C>T (10%), c.984delC (10%) of MMUT gene, and c.609G>A (45%), c.80A>G (10%) , c.567dupT (10%) of MMACHC gene. Among these, c.2000A>G of MMUT, c.298G>T of MMACHC and c.734-7A>G of MMAA gene were unreported previously. CONCLUSION Genetic testing for MMA patients can clarify the cause of the disease and provide a basis for the clinical diagnosis. Discovery of novel variants has enriched the mutational spectrum of MMA.
Amino Acid Metabolism, Inborn Errors/genetics* ; Genetic Testing ; High-Throughput Nucleotide Sequencing ; Humans ; Mutation ; Oxidoreductases/genetics*

We retrospectively analyzed a child with early-onset globoid cell leukodystrophy(Krabbe's disease)caused by complex heterozygous variations in the GALC gene.The girl was admitted to the hospital at the age of 4 month with main complaints of"No obvious cause of milk refusal,poor mental state,drowsiness,convulsions,fever."Brain MRI showed abnormal symmetric signals changes in bilateral cerebellar hemispheres,bilateral internal capsule hind limbs and bilateral ventricles,thin corpus callosum,myelination process lags behind the level of children of the same age.High-throughput sequencing analysis identified compound heterozygous mutations in GALC gene(NM 000153.4):c.[908+1G>A];[194G>A and the two heterozygous mutations were correspondingly inherited from his father and mother,respectively.The application of high-throughput sequencing technology can diagnose Krabbe disease efficiently and accurately,which assists in clinical identification and diagnosis.

OBJECTIVE: To explore the clinical features and genetic basis for a child with 3-methylglutaconic aciduria type VII. METHODS: A child who was diagnosed at the Gansu Provincial Maternity and Child Health Care Hospital on August 9, 2019 was selected as the study subject. Clinical data of the child, including urine gas chromatography and mass spectrometry, were collected. The child and her parents were subjected to whole exome sequencing. RESULTS: The child, a female neonate, had presented mainly with intermittent skin cyanosis, convulsions, hypomagnesemia, apnea, neutropenia after birth. Her urine 3-methylpentenedioic acid has increased to 17.53 μmol/L. DNA sequencing revealed that she has harbored compound heterozygous variants of the CLPB gene, namely c.1016delT (p.L339Rfs*5) and c.1087A>G (p.R363G), which were respectively inherited from her mother and father. Both variants were unreported previously. Based on the standards from the American College of Medical Genetics and Genomics (ACMG), the variants were respectively predicted to be pathogenic and likely pathogenic. CONCLUSION The child was diagnosed with 3-methylglutenedioic aciduria type VII. Discovery of the c.1016delT and c.1087A>G variants has enriched the mutational spectrum of the CLPB gene.
Female ; Humans ; Infant, Newborn ; Pregnancy ; Base Sequence ; Metabolism, Inborn Errors/diagnosis* ; Mutation ; Neutropenia/genetics* ; Sequence Analysis, DNA