The broad autism phenotype has fascinated researchers for decades. It describes a constellation of milder autistic characteristics—such as socially aloof personality, pragmatic language difficulties, and rigid, inflexible behavior—that appear at levels below the threshold for an autism diagnosis. Studies have repeatedly shown that these traits are more common among first-degree relatives of children with autism spectrum disorder than in the general population, a pattern that has helped researchers understand the hereditary architecture of autism. Because the phenotype represents an expression of the same genetic liability that, in stronger forms, produces the full condition, measuring it accurately in relatives can sharpen both genetic studies and family-centered clinical research.

The questionnaire at the heart of the new study, originally developed in English, is a 36-item self-report measure designed to capture these traits in adults. It yields a total score along with three subscale scores corresponding to its three underlying dimensions: Aloof Personality, Rigid Personality, and Pragmatic Language. Each item is rated on a six-point scale ranging from strongly disagree to strongly agree, allowing respondents to convey nuanced self-assessments. Translating such an instrument, however, is far more mechanical than swapping words between languages; it demands careful cultural adaptation so that idioms, social norms, and conceptual framings resonate with the target population while preserving the original construct.

To establish the Turkish version, the research team, led by corresponding author Mert Şenel of the Department of Psychiatry at Ankara Bilkent City Hospital, recruited a sample of 164 parents of children diagnosed with autism spectrum disorder and 81 parents of typically developing children. Every participant completed both the adapted Broad Autism Phenotype Questionnaire and the Autism Quotient, a widely used screening instrument for autistic traits in adults. In addition, the researchers evaluated test–retest reliability by asking 44 randomly selected parents of children with autism to complete the questionnaire again after an interval of three to four weeks, a standard approach for checking whether a measure produces stable results over time.

The statistical scrutiny began with confirmatory factor analysis, a technique that tests whether data collected with the translated instrument fit a predetermined structure—in this case, the original three-factor model of Aloof Personality, Rigid Personality, and Pragmatic Language. The results supported retaining the original three-factor architecture, an encouraging outcome because it means the Turkish version measures the same underlying constructs as the source instrument rather than something subtly different. That structural fidelity matters enormously when researchers want to compare findings across countries or pool data in international studies of autism genetics and family traits.

Reliability findings were largely strong. Internal consistency, assessed with Cronbach’s alpha, reached 0.840 for the total score in the self-report format and 0.831 in the informant-report format—values conventionally interpreted as good. One caveat emerged for the Rigid Personality subscale, where alphas fell to 0.610 for self-report and 0.525 for informant-report, indicating weaker internal consistency for that specific dimension. The authors report that the final construction of the questionnaire incorporated the outcomes of the confirmatory factor analysis, and the overall instrument performed reliably. Test–retest stability was assessed with the intraclass correlation coefficient, which came in at 0.815, a figure consistent with good temporal stability over the three-to-four-week retest window.

Convergent validity also received support. Scores on the Turkish Broad Autism Phenotype Questionnaire correlated significantly with scores on the Autism Quotient, meaning that parents who reported more broad-phenotype traits on one measure tended to report more autistic traits on the other. This pattern of agreement between two independently developed instruments is exactly what validity researchers hope to see, because it suggests both tools are tapping into the same psychological territory rather than measuring unrelated noise.

The discriminative results told a more nuanced story. When the researchers examined best-estimate scores—which combine self-report and informant-report information—the questionnaire distinguished significantly between parents of children with autism and parents of typically developing children, with the autism group scoring higher, precisely as the broad autism phenotype literature predicts. Interestingly, however, no significant between-group difference appeared when only self-report scores were analyzed. The authors note this contrast candidly: the combined best-estimate approach captured the group difference while self-report alone did not. This finding may reflect well-documented limitations of self-assessment for socially undesirable or subtly atypical traits, since people with aloof or rigid tendencies may not recognize or report them accurately. It also underscores the practical value of informant reports from spouses or close relatives, who may observe traits the individual himself or herself underestimates.

The research team spanned multiple institutions, including the Department of Child and Adolescent Psychiatry at Ankara Bilkent City Hospital, Gölbaşı Şehit Ahmet Özsoy State Hospital, and the Department of Speech Pathology and Audiology at the National Institute of Mental Health and Neurosciences in Bangalore, India, with Shoba S. Meera among the co-authors. The study received no external funding, was approved by the Ankara Bilkent City Hospital Ethics Committee, and was conducted in accordance with the Declaration of Helsinki, with written informed consent from all participants. The authors acknowledge the contribution of Joseph Piven, a leading figure in broad autism phenotype research, and declare no competing interests.

Why does a Turkish-language questionnaire matter beyond Türkiye? Validated instruments are the currency of cumulative science. Without them, researchers in non-English-speaking countries cannot reliably measure the phenotypes that genetic and epidemiological studies require, and cross-cultural comparisons become fraught with uncertainty about whether observed differences reflect real variation or translation artifacts. With the Broad Autism Phenotype Questionnaire now shown to be a useful instrument for assessing these traits among parents of children with autism spectrum disorder in the Turkish population, local researchers gain entry to a global research conversation. The tool can support studies of autism heritability, family counseling, screening of relatives, and investigations of how subthreshold traits relate to parenting stress, family dynamics, and developmental outcomes in siblings. At the same time, the weaker performance of the Rigid Personality subscale signals an area for continued refinement, and the advantage of best-estimate scoring offers practical guidance for future users. For a condition as genetically complex as autism, instruments like this one are quiet but essential infrastructure—unremarkable to look at, yet indispensable for translating biological insight into clinically meaningful knowledge about families living with autism.

Subject of Research: Cultural adaptation and psychometric validation of the Turkish Broad Autism Phenotype Questionnaire in parents of children with autism spectrum disorder

Article Title: Cultural adaptation and psychometric properties of the Turkish version of the broad autism phenotype questionnaire in parents of children with autism spectrum disorder

Article References: Şenel, M., Akçay, E., Büyüklüoğlu, N., Kaynak, M., Meera, S. S., Kaya, H., Çöp, E., & Göka, E. (2026). Cultural adaptation and psychometric properties of the Turkish version of the broad autism phenotype questionnaire in parents of children with autism spectrum disorder. BMC Psychology. https://doi.org/10.1186/s40359-026-05597-w

Image Credits: AI Generated

DOI: 10.1186/s40359-026-05597-w

Keywords: broad autism phenotype, autism spectrum disorder, BAPQ, psychometrics, Turkish validation, autistic traits, parents of children with autism, confirmatory factor analysis, reliability and validity, Autism Quotient, cultural adaptation, BMC Psychology

A compelling development in the understanding of autism’s biological roots has emerged from recent studies linking ASD with congenital heart disease (CHD), a physical anomaly affecting the structure and function of the heart evident at birth. This co-occurrence has long puzzled clinicians and scientists since ASD primarily impacts neurodevelopment, while CHD is considered a cardiac structural disorder. The capacity to identify CHD at birth suggests a potential biomarker or early flag for children at increased risk of developing autism, opening avenues for earlier surveillance and intervention strategies.

Leading this groundbreaking investigation, Dr. Helen Willsey and her research team at the University of California, San Francisco have illuminated a shared biological foundation between autism and congenital heart disease, centered around cellular organelles known as cilia. These minuscule, hair-like projections studding the surface of almost every mammalian cell play pivotal roles in sensing environmental cues, facilitating intercellular signaling, and governing the movement and structural development of organs during embryogenesis. The study’s results, published in Development on June 24, 2025, provide a transformative lens through which autism and CHD are understood as intersecting pathologies unified by ciliary dysfunction.

Dr. Willsey elaborates on the formidable complexity intrinsic to dissecting the genetic interplay between autism and CHD, noting the sheer magnitude of implicated genes — with previous research identifying 361 genes that elevate risks for either or both conditions. The central question her team posed was whether the subset of CHD-associated genes exerting direct effects on neuronal cells might converge with autism risk factors, potentially revealing critical nodes of developmental vulnerability within the intertwined biology of brain and heart formation.

To probe these hypotheses, co-author Nia Teerikorpi conducted meticulous experiments involving immature human neurons genetically engineered to harbor mutations in each of the 361 candidate genes. This functional screen identified 45 genes whose loss profoundly impaired neuronal growth and morphology. A striking revelation emerged as all these genes were intimately linked to the structure and function of cilia. These organelles are essential in orchestrating key signaling pathways, such as Hedgehog and Wnt, which modulate cellular proliferation, migration, and differentiation during central nervous system and cardiac development.

Among the identified genes, taok1 rose to prominence for its dual association with autism risk and predicted involvement in congenital heart disease, an intersection never before empirically tested in vivo. The research team employed Xenopus laevis frog embryos as a model to experimentally modulate taok1 expression, taking advantage of the organism’s amenability to genetic manipulation and its conserved developmental pathways. Upon disruption of taok1, they observed profound defects in cilia formation on cellular surfaces, accompanied by abnormal morphogenesis of cardiac and neural tissues. These findings provide compelling functional validation that taok1 is a key regulatory node in the shared developmental pathways disrupted in autism and congenital heart malformations.

The broader implication of this research indicates that defects in ciliary biology likely represent a fundamental mechanistic bridge underlying multiple neurodevelopmental and congenital disorders. The other 44 genes identified, all integral to ciliary function, now warrant in-depth investigation into their roles in cardiac and neural development. Perturbations in cilia can disrupt the spatiotemporal signaling milieu essential for organogenesis, leading to malformations and functional impairments seen in both ASD and CHD.

Looking beyond immediate results, Dr. Willsey and her team emphasize that their discoveries represent only the beginning of unraveling the molecular entanglement between autism and cardiac developmental disorders. The intersecting gene networks implicated in ciliary dynamics offer a rich tapestry of potential diagnostic markers and therapeutic targets. Prioritizing patients with mutations in these cilia-associated genes for early neurodevelopmental monitoring could facilitate preemptive interventions, possibly attenuating the severity of ASD manifestations or improving cardiac outcomes through timely clinical management.

This research ushers in a paradigm shift, challenging the traditional view of autism and congenital heart disease as distinct clinical entities and instead positing that their pathogenesis is interwoven at a cellular and molecular level. Understanding ciliary biology’s centrality could pave the way for precision medicine approaches that integrate genetic, developmental, and clinical data to stratify risk and tailor therapies for affected individuals.

Moreover, it compels the scientific community to explore ciliary function across other congenital and neurodevelopmental disorders, potentially revealing a broader spectrum of ciliopathies with overlapping phenotypic features. Such insights would transform developmental biology, foster interdisciplinary collaborations, and galvanize new research directions in genetics, cell biology, and clinical neuroscience.

In conclusion, the work spearheaded by Dr. Helen Willsey’s group provides a critical breakthrough in linking autism spectrum disorders to congenital heart disease through the lens of ciliary dysfunction. By elucidating the shared genetic and cellular underpinnings, this study opens exciting prospects for early detection, intervention, and a deeper mechanistic understanding of these complex conditions. The findings published in Development hold promise not only for affected families but also for the broader endeavor to decode human developmental biology and pathology.

Subject of Research: Animals

Article Title: Ciliary biology intersects autism and congenital heart disease

News Publication Date: 24-Jun-2025

References:
Teerikorpi, N., McCluskey, K. E., Bader, E., Lasser, M.C., Wang, S., Nguyen, C. H., Schmidt, J. D., Kostyanovskaya, E., Sun, N., Dea, J., et al. (2025). Ciliary biology intersects autism and congenital heart disease. Development 152, dev204295. doi:10.1242/dev.204295

Image Credits: James Schmidt

Keywords: autism spectrum disorder, congenital heart disease, cilia, neurodevelopment, genetics, taok1, developmental biology, precision medicine, neurogenetics, embryonic development