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Family-based association study of ZNF804A polymorphisms and autism in a Han Chinese population

BMC Psychiatry volume 19, Article number: 159 (2019) Cite this article

Abstract

Background

Autism is a complex neurodevelopmental disorder with high heritability. Zinc finger protein 804A (ZNF804A) was suggested to play important roles in neurodevelopment. Previous studies indicated that single-nucleotide polymorphism (SNP) rs1344706 in ZNF804A was strongly associated with schizophrenia and might influence social interaction. Only one study explored the significance of ZNF804A polymorphisms in autism, which discovered that rs7603001 was nominally associated with autism. Moreover, no previous study investigated the association between ZNF804A and autism in a Han Chinese population. Here, we investigated whether these two SNPs (rs1344706 and rs7603001) in ZNF804A contribute to the risk of autism in a Han Chinese population.

Methods

We performed a family-based association study in 640 Han Chinese autism trios. Sanger sequencing was used for sample genotyping. Then, single marker association analyses were conducted using the family-based association test (FBAT) program.

Results

No significant association was found between the two SNPs (rs1344706 and rs7603001) in ZNF804A and autism (P > 0.05).

Conclusions

Our findings suggested that rs1344706 and rs7603001 in ZNF804A might not be associated with autism in a Han Chinese population.

Peer Review reports

Background

Autism is a complex neurodevelopmental disorder, characterized by early-onset impairments in social interaction and communication, repetitive behaviors, and restricted interests. The worldwide prevalence of autism was estimated to about 1% with a male-to-female ratio of 3–4:1 [1, 2]. The high concordance between identical twins (nearly 90%) indicated the critical role of genetic factors in the pathogenesis of autism [3, 4]. Despite the research progress made over the past few decades, the genetic pathogenesis of autism remains largely unclear [5,6,7,8].

Zinc finger protein 804A (ZNF804A) is located in 2q32.1 and encodes a protein containing a C2H2-type zinc finger domain, which participates in DNA binding and transcription regulation [9,10,11]. ZNF804A is highly expressed in the human brain with a subcellular distribution in somatodendritic compartments [12]. Besides, high expression of Znf804a was found in developing brains of mice, especially during the late developmental stages (> 20 weeks) [13]. Furthermore, functional studies suggested that ZNF804A might affect the expression of the genes involved in neurite outgrowth, synapse formation, and dopaminergic transmission [11, 14]. Postmortem studies of autistic individuals detected reduced expression of ZNF804A in the anterior cingulate gyrus (ACG), which was implicated in social behaviors and cognition [15, 16]. Altogether, these findings suggested that ZNF804A might play important roles in neurodevelopment.

Previous studies indicated that single-nucleotide polymorphism (SNP) rs1344706 in ZNF804A was strongly associated with schizophrenia (SCZ) [13, 17,18,19,20,21]. This disorder was suggested to overlap with autism partially in clinical phenotypes and susceptibility genes [22]. A neuroimaging study reported that the risk allele A of rs1344706 exerted a significant allele-dose effect in parts of the theory of mind (ToM) network, such as the left inferior prefrontal cortex, which was associated with social impairments in autism [23, 24]. ToM refers to the ability of understanding the feelings or thoughts of others, which is crucial for social interaction [25, 26]. Impairments of this ability represent a core deficit of autism [27,28,29]. In addition, rs7603001 in ZNF804A was nominally associated with autism (P = 0.018) in 841 autistic families from the Autism Genetic Resource Exchange (AGRE), most of whom were white [15].

Given the important roles of ZNF804A in neurodevelopment and the lack of studies exploring the association between ZNF804A polymorphisms and autism in the Han Chinese population, we conducted a family-based association study of two SNPs (rs1344706 and rs7603001) in ZNF804A with 640 autism trios of Han Chinese ancestry.

Material and methods

Participants

A total of 640 autistic nuclear trios (autistic children and their biological parents) were included in the study. All participants were of Han Chinese ancestry and recruited at Peking University Sixth Hospital, China. The median age of diagnosis for autistic children was 4.75 (range 3–16) years. The sex ratio (male:female) was approximately 7:1, including 563 male and 77 female children.

The autistic children were independently evaluated by two senior psychiatrists according to the Diagnostic and Statistical Manual of Mental Disorders, fourth edition criteria for autism. Additional criteria for patient inclusion were Autism Behavior Checklist score ≥ 53 and Childhood Autism Rating Scale ≥35 [30, 31]. Children diagnosed with Asperger syndrome, Rett syndrome, pervasive development disorder not otherwise specified, fragile X syndrome, tuberous sclerosis, a previously identified chromosomal abnormality, dysmorphic features, or any other neurological conditions were excluded from the present study. All the parents were evaluated through unstructured interviews by two psychiatrists to confirm that they were not affected with autism spectrum disorder (ASD). Any individuals with familial (inherited) diseases (such as congenital deaf-mutism, hemophilia, and familial adenomatous polyposis) or severe mental disorders (such as SCZ, schizoaffective disorder and bipolar disorder) were excluded in the study.

SNPs selection

Two polymorphisms in ZNF804A (rs1344706 and rs7603001) were selected in the present study. The criteria for SNPs selection were as follows: (1) SNPs reported association with autism or ASD were selected; (2) risk variants of other mental disorders (such as SCZ, depression, and bipolar disorder) were also taken into account; (3) The minor allele frequencies (MAF) of selected SNPs should be greater than 0.05 in the Han Chinese in Beijing, China (CHB). The genotyping data of SNPs were downloaded from the databases Ensembl GRCh37 Release 93 (http://grch37.ensembl.org/index.html) and dbSNP in National Center for Biotechnology Information (NCBI) (https://0-www-ncbi-nlm-nih-gov.brum.beds.ac.uk/snp) [32].

DNA extraction and genotyping

Peripheral blood samples were collected from all participants in the morning. Genomic DNA was extracted using the Qiagen QIAamp DNA Mini Kit (Qiagen, Hilden, Germany) following the manufacturer’s instructions. NanoDrop Spectrophotometer (Thermo Fisher Scientific, Waltham, MA, USA) was used to confirm that the concentrations of the extracted DNA were greater than 40 ng/uL.

Genotyping for rs1344706 and rs7603001 was performed by Sanger DNA sequencing. All primers for the polymerase chain reaction (PCR) were designed through the Primer-BLAST tool of the NCBI (https://0-www-ncbi-nlm-nih-gov.brum.beds.ac.uk/tools/primer-blast/) according to the sequence of the forward strands provided by the NCBI human reference genome GRCh38 (hg38). The primers used for rs1344706 were as follows: forward, 5′-ATTGGGACGAGGAGAAAA-3′; and reverse, 5′-GTCAAATAAGCCTGAGGAAT-3′. The primers for rs7603001 were the following: forward, 5′-TTCCAGAAAGCCATTCGTGTGTA-3′; and reverse, 5′-GAGCACCAGGAGAAACCAGT-3′. The PCR amplification for the Sanger sequencing was performed in a 15-μL mixture consisting of 1 μL of genomic DNA, 7.5 μL of 2× Easy Tag SuperMix (TransGen Biotech, Beijing, China), and 1.5 μL of each primers. The reaction was initiated with an initial denaturation at 95 °C for 5 min, followed by 38 cycles of denaturation at 95 °C for 30 s, annealing at 60 °C for rs1344706 and 64 °C for rs7603001 for 30 s, and extension at 72 °C for 42 s, followed by a final extension at 72 °C for 7 min. Then, Sanger sequencing of the amplified products was outsourced to BGI (Beijing, China). DNA sequencing was performed using the BigDye Terminator Cycle Sequencing Ready Reaction Kit with Ampli Taq DNA polymerase (PE Biosystem) and the ABI PRISM 377–96 DNA Sequencer (Applied Biosystem, Foster city, USA).

Data analysis

Quanto, version 1.2.4 (http://biostats.usc.edu/software), was employed to evaluate the statistical power for risk allele detection [33]. The parameters were set to a population risk of 0.01, an estimated relative risk for common variants of 1.1 to 1.2, and a type I error rate of 0.05 (two-sided) under the log-additive model [15, 34]. The chi-square goodness-of-fit test was conducted to analyze the deviation from the Hardy–Weinberg equilibrium (HWE) for the genotype frequency distributions.

The family-based association test (FBAT) program, version 2.0.3, was used to check the Mendelian errors and reset the genotypes of the families with Mendelian errors to zero [35]. Then, single marker association analyses were conducted by the FBAT program under the additive and recessive inheritance models, respectively. All P-values calculated by the FBAT were two-sided. Bonferroni correction was applied to decrease the type I errors with a significance level of P < α/n (α = 0.05) [36]. The ratio of transmission to untransmission (T:U) for the alleles of each SNP was calculated using Haploview software, version 4.2 (http://www.broad.mit.edu/mpg/haploview/).

Linkage disequilibrium analyses were conducted by both FBAT and Haploview software. The pairwise linkage between two SNPs was estimated by the normalized disequilibrium coefficient (D’) and the squared correlation coefficient (r2). Then the global and individual haplotype tests of association were performed under multiallelic and biallelic mode in haplotype-based association test (HBAT) using FBAT software. The permutation test (n = 10,000) was used for multiple testing correction in HBAT. All P-values involved in HBAT were two-sided.

In silico analyses of ZNF804A polymorphisms

Some online tools were used to predict the functions of SNPs in ZNF804A. HaploReg v4.1 (https://pubs.broadinstitute.org/mammals/haploreg/haploreg.php) was a tool for exploring the variants on haplotype blocks about their chromatin state and protein binding annotation, sequence conservation and effect on regulatory motifs and expression [37]. Genotype-Tissue Expression (GTEx) database (http://www.gtexportal.org/) provided the eQTL data to study relationship between genetic variation and gene expression in multiple human tissues. rVarBase (http://rv.psych.ac.cn/) and miRNASNP (http://bioinfo.life.hust.edu.cn/miRNASNP2/) were used to detected whether the associated SNPs were in the transcription factor (TF) binding regions, miRNA target regions, or miRNA seed regions [38, 39].

Results

Quality control

The MAF in CHB for rs1344706 and rs7603001 were greater than 0.05 (MAF = 0.476 and 0.204, respectively) in the Ensembl GRCh37 Release 93 database. In the present study, the MAF for these two SNPs were equal to 0.499 and 0.176, respectively. The call rates, determined by Sanger sequencing, were 97.7% for rs1344706 and 100% for rs7603001. The power to detect a true risk variant was 23%–63% for rs1344706 and 15%–40% for rs7603001 under the log-additive model. The genotypic distributions of these two SNPs in both unaffected parents and affected offspring did not derive from the HWE (P > 0.05, Table 1).

Table 1 Genotypic distributions of rs1344706 and rs7603001 in ZNF804A in 640 Han Chinese autism trios
Full size table

SNP association and haplotype analyses

The results from the single-SNP association analyses revealed that neither of the SNPs (rs1344706 and rs7603001) was significantly associated with autism under the additive or recessive inheritance model (Table 2). The value of D’ and r2 between rs1344706 and rs7603001 were 0.984 and 0.207, respectively (Fig. 1). Haplotype-based association analyses showed that no haplotypes were associated with autism (Table 3).

Table 2 Association analyses results of rs1344706 and rs7603001 in ZNF804A in 640 Han Chinese autism trios
Full size table
Fig. 1
figure 1

Linkage disequilibrium block constructed from rs7603001 and rs1344706 in ZNF804A. a Markers with linkage disequilibrium (LD) (D’ ≤ 1 and LOD ≥ 2) are shown in red. Values of D’ shown in the square represents pairwise LD relationship between the two polymorphisms. b Markers with LD (0 < r2 ≤ 1) are shown in grey with r2 value in the square. The LD plot was generated using the Halpoview program. The genotyping data was downloaded from Ensembl GCRh37 Release 93

Full size image
Table 3 Haplotype-based association analyses between rs1344706 and rs7603001 in ZNF804A in 640 Han Chinese autism trios
Full size table

Putative regulatory function and eQTL of selected SNPs

The function prediction using HaploReg showed that both rs1344706 and rs7603001 might alter the regulatory motifs (Additional file 1: Table S1). However, eQTL data from GTEx database demonstrated that both rs1344706 and rs7603001 were not associated with the expression of ZNF804A in human brain. Online databases rVarbase and miRNASNP revealed that neither of these two variants might be in TF binding regions, miRNA target regions, or miRNA seed regions.

Discussion

This family-based association study was performed in 640 Han Chinese autism trios to investigate the relationships between two SNPs (rs1344706 and rs7603001) in ZNF804A and autism. Our results indicated that these two SNPs were not associated with autism in a Han Chinese population.

Our findings were inconsistent with those of a previous study. Using data of 841 autistic families from AGRE, Anitha et al. found that rs7603001 in ZNF804A was nominally associated with autism (P = 0.018), especially in the subgroup of autistic individuals with verbal deficit (P = 0.008). Another SNP, rs1344706, which was frequently reported in SCZ, showed no association with autism [15]. In addition, no association of rs1344706 (OR for A allele = 0.9805, P = 0.1597) or rs7603001 (OR for A allele = 0.9848, P = 0.2666) was found using genome-wide association data from the Integrative Psychiatric Research and the Psychiatric Genomics Consortium released in 2017 (iPSYCH-PGC GWAS 2017, available at: http://www.med.unc.edu/pgc/results-and-downloads), which included data of 18,381 autistic individuals and 27,969 controls [40].

Although this study detected no association between ZNF804A and autism, certain factors should be considered for further studies. First, autism is a complex heterogeneous disorder. Susceptibility genes might contribute to different subgroups of autism [41,42,43,44,45]. Concerning ZNF804A, a nominal association was detected between rs7603001 and autism, especially in autism individuals with verbal deficit. Hence, the relationship between candidate genes and specific phenotypes of autism should be further explored. Second, other SNPs or structural abnormalities such as copy number variations (CNVs) in ZNF804A might be involved in the etiology of autism. In the dataset of iPSYCH-PGC GWAS 2017, a few SNPs, including rs146362735, rs114385979, and rs77076543, were nominally associated with ASD (P < 0.01). However, these SNPs showed no polymorphism in the CHB population. Recently, one study found that rs10497655 in ZNF804A was significantly associated with ASD (OR = 1.20 (95%CI 1.05–1.37), P = 0.007851) in a Han Chinese cohort (854 cases and 926 controls) and the T risk allele homozygotes of rs10497655 could reduce ZNF804A expression [46]. On the other hand, Griswold et al. found duplications of CNVs in ZNF804A only in autistic individuals [47]. In another study, an excess of CNVs in ZNF804A was detected in 19,556 patients with neurodevelopmental disorders compared with 13,991 controls (P = 0.047) [48]. Therefore, the association between autism and other SNPs, and/or structural abnormalities in ZNF804A should be further investigated. Third, differences in ethnic genetic background might contribute to the result inconsistencies. For instance, r2 between rs1344706 and rs7603001 were 0.637, 0.232 and 0.353 in CEU (Utah residents with Northern and Western European ancestry from the CEPH collection), CHB and JPT (Japanese in Tokyo), respectively (Additional file 1: Figure S1). Besides, rs1344706 was reported to confer risk of SCZ in the European populations. However, a meta-analysis study found only nominal association between this variant and SCZ in the Asian population (13,452 cases, 17,826 healthy controls, and 680 families). No association was showed between rs1344706 and SCZ in samples from the Chinese population [49]. Association studies in other populations are required to assess the involvement of ZNF804A in autism. Fourth, the present sample size was limited. More autism patients and families of Han Chinese ancestry need to be involved in further researches to increase the statistical power and might help indicate new susceptibility variants.

Conclusions

In summary, this study suggested that rs1344706 and rs7603001 in ZNF804A were not associated with autism in a Han Chinese population. Further research is needed to comprehensively explore the relationships between ZNF804A and autism.

Abbreviations

ACG:

Anterior cingulate gyrus

AGRE:

Autism Genetic Resource Exchange

ASD:

Autism spectrum disorder

CEU:

Utah residents with Northern and Western European ancestry from the CEPH collection

CHB:

Han Chinese in Beijing, China

CNVs:

Copy number variations

FBAT:

Family-based association test

GTEx:

Genotype-Tissue Expression

HBAT:

Haplotype-based association test

HWE:

Hardy–Weinberg equilibrium

iPSYCH-PGC GWAS 2017:

Integrative Psychiatric Research and the Psychiatric Genomics Consortium released in 2017

JPT:

Japanese in Tokyo

MAF:

Minor allele frequency

NCBI:

National Center for Biotechnology Information

PCR:

Polymerase chain reaction

SCZ:

Schizophrenia

SNP:

Single-nucleotide polymorphism

TF:

Transcription factor

ToM:

Theory of mind

ZNF804A :

Zinc finger protein 804A

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Acknowledgements

We thank all of the participants for their cooperation in this study.

Funding

This work was supported by grants from the National Key R&D Program of China (grant number 2017YFC1309901) and the National Natural Science Foundation of China (grant numbers 81671363, 81730037, and 81871077).

Availability of data and materials

For access to the data in this paper, interested researchers may contact the corresponding author via email: lifangwang@bjmu.edu.cn (L. Wang).

Author information

Author notes

  1. Ziqi Wang, Tian Zhang and Jing Liu contributed equally to this work.

Authors and Affiliations

  1. Peking University Sixth Hospital, No. 51, Hua Yuan Bei Road, Beijing, 100191, China

    Ziqi Wang, Tian Zhang, Jing Liu, Han Wang, Tianlan Lu, Meixiang Jia, Dai Zhang, Lifang Wang & Jun Li

  2. Peking University Institute of Mental Health, Beijing, 100191, China

    Ziqi Wang, Tian Zhang, Jing Liu, Han Wang, Tianlan Lu, Meixiang Jia, Dai Zhang, Lifang Wang & Jun Li

  3. NHC Key Laboratory of Mental Health (Peking University), Beijing, 100191, China

    Ziqi Wang, Tian Zhang, Jing Liu, Han Wang, Tianlan Lu, Meixiang Jia, Dai Zhang, Lifang Wang & Jun Li

  4. National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, 100191, China

    Ziqi Wang, Tian Zhang, Jing Liu, Han Wang, Tianlan Lu, Meixiang Jia, Dai Zhang, Lifang Wang & Jun Li

  5. Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China

    Dai Zhang

  6. PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, 100871, China

    Dai Zhang

Authors
  1. Ziqi Wang
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  2. Tian Zhang
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  3. Jing Liu
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  4. Han Wang
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  5. Tianlan Lu
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  6. Meixiang Jia
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  7. Dai Zhang
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  8. Lifang Wang
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  9. Jun Li
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Contributions

DZ, J Li, and LW conceived and designed the study. MJ and LW recruited and evaluated all the participants. MJ, J Liu, TL, and HW collected DNA samples. ZW, TZ, HW, and TL genotyped SNPs and processed data for analysis. ZW, TZ, and J Li performed the statistical analysis. ZW and TZ wrote the original manuscript. ZW, TZ, J Liu, HW, DZ, J Li, and LW revised the article and contributed to the final version of the manuscript. All authors have reviewed and approved the final manuscript.

Corresponding authors

Correspondence to Dai Zhang, Lifang Wang or Jun Li.

Ethics declarations

Ethics approval and consent to participate

This study was approved by the Ethics Committee of Peking University Sixth Hospital (Beijing, China). Written informed consent was obtained from each participant/legal guardian included in the study.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no conflict of interest.

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Additional file

Additional file 1:

Table S1. Functional annotation of rs7603001 and rs1344706 in ZNF804A using HaploReg. Figure S1. Linkage disequilibrium block constructed from rs7603001 and rs1344706 in ZNF804A in different populations. (DOCX 132 kb)

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Wang, Z., Zhang, T., Liu, J. et al. Family-based association study of ZNF804A polymorphisms and autism in a Han Chinese population. BMC Psychiatry 19, 159 (2019). https://0-doi-org.brum.beds.ac.uk/10.1186/s12888-019-2144-1

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  • DOI: https://0-doi-org.brum.beds.ac.uk/10.1186/s12888-019-2144-1

Keywords

BMC Psychiatry

ISSN: 1471-244X

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