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Open research questions in Congenital heart defects research

26 unresolved questions extracted from the limitations and future-work sections of 128 Congenital heart defects research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Second, as a single case report, the causal relationship cannot be definitively established; the observed DCM may partly reflect chronic hemodynamic stress from congenital valve disease and multiple surgeries rather than being solely attributable to PLD1 deficiency, and the potential roles of genetic modifiers, epigenetic factors, or environmental influences remain unknown, so generalization from this single case warrants caution.

    Novel compound heterozygous variants in the PLD1 gene causing cardiac valve dysplasia 1 complicated with dilated cardiomyopathy: a case report · 2026 · DOI

  • Klf9 levels decrease during cardiac hypertrophy; however, no studies have examined its transcriptional targets or role in the progression of hypertrophy.

    Restoring Klf9 Expression with Pressure Overload Leads to Metabolic Maladaptation and Early Onset of Heart Failure · 2026 · DOI

  • Aim: Ventricular septal defect (VSD) is the most prevalent congenital cardiac malformation, yet its molecular and genetic determinants remain incompletely understood.

    Genetic and pathway analysis of ventricular septal defect: A comprehensive study · 2026 · DOI

  • The vertebrate heart is composed of heterogeneous cardiomyocyte (CM) populations, however, the roles of distinct CM subpopulations in heart development and repair remain poorly defined.

    Primordial cardiomyocytes orchestrate myocardial morphogenesis and vascularization but are dispensable for regeneration · 2026 · DOI

  • Most insights into ploidy regulation have come from studies of ventricular CMs, whereas the spatiotemporal dynamics and molecular regulation of atrial CM polyploidy remain poorly understood.

    Endothelin-1 signaling regulates chamber-specific mouse atrial cardiomyocyte cytokinesis and polyploidy · 2026 · DOI

  • Enhancer of zeste homolog 2 (EZH2), the catalytic subunit of Polycomb Repressive Complex 2, catalyzes H3K27 trimethylation and directs lineage development programs, yet its function in early multipotent progenitors remains incompletely understood.

    Enhancer of zeste homolog 2 (Ezh2) is required in mouse Isl1-expressing progenitors for proper development of cardiac and skeletal hindlimb structures · 2026 · DOI

  • The present study is subject to several limitations. Dif- ferent age-adapted ADHD questionnaires were used in children and adults requiring separate analyses of the relationship between ADHD symptoms and olfaction/ echogenicity of SN in both age groups, thus reducing sta- tistical power. Correlations with severity of symptoms of PD, SCZ and ADHD could only be performed in a sub- sample of the patients. Our data collection for the study included ENT abnor- malities, asthma, allergies and smoking. Individuals with respiratory problems were not included in the study. Smoking was very rare in our sample. Since we did not include this data in our dataset in a standardized manner, the study does not contain any systematic analyses in this regard. Overall, we consider the likelihood of serious lim- itations resulting from these factors to be low. According to clinical assessment, further somatic symptoms that occurred were representative of the typical phenotypes possible in 22q11.2DS. However, they were not part of the survey and we did not control for their impact on olfaction.

    Olfaction and substantia nigra echogenicity in young individuals with 22q11.2 deletion syndrome, a population at high risk for dopaminergic neuropsychiatric disease · 2026 · DOI

  • genotype–phenotype correlation, several must be acknowledged. First, this is a single-case report; as such, the findings may not be generalizable to all individuals carrying variants in the JAG1 gene. Second, while computational evidence and high evolutionary conservation suggest the c.1127A > G (p.Asp376Gly) variant is deleterious, we did not perform functional confirmation (such as in vitro assays) to definitively characterize the mutation’s impact on the Notch signaling pathway. Third, although whole exome sequencing was utilized, this Fig. 4 a Pedigree of the reported case showing carrier status of the mother and the proband. b Jagged-1 domains illustration pointing to the reported mutation in the third epidermal growth factor-like domain (DSL: Delta/Serrate/Lag-2, EGF: epidermal growth factor-like domain, CA: calcium, VWC: Von Willebrand factor type C domain). All this figure parts were created by the authors of this study Alahmed et al. Journal of Medical Case Reports (2026) 20:263 Page 6 of 6 method primarily captures protein-coding regions and may overlook deep intronic variants or complex structural rearrangements that could influence the isolated cardiac phenotype observed. Finally, the patient was born extremely preterm (25 weeks), which may have acted as a confounding factor in the severity of the phenotype. Saudi Arabia. 2 Department of Cardiac Sciences, King Abdullah International Medical Research Center, Ministry of the National Guard, Health Affairs, King Saud Bin Abdulaziz University for Health Sciences, 11481 Riyadh, Saudi Arabia. 3 Laboratoire Biomnis Eurofins, 17-19 Avenue Tony Garnier, 69007 Lyon, France. 4 CPDP, Hôpital MFME, CHU Martinique, 97200 Fort de France, Martinique.

    Jagged-1 mutation is associated with congenital heart defects: a case report · 2026 · DOI

  • While ambient RNA was already performed by the individual studies, the lack of the same ambient RNA removal steps may have resulted in inadequate ambient RNA removal, which is a major limitation of the current snRNA-seq method.

    An integrative single-nucleus multiomic atlas of the human left ventricle identifies gene regulatory network dynamics across cardiac development, aging, and disease · 2026 · DOI

  • The role of progesterone in patterning male and female behaviors has been identified, but the specific contributions of progesterone receptor-expressing neurons to individual sex-dimorphic behaviors (such as lordosis, aggression, or predator defense) and how progesterone signaling integrates with concurrent estrogen and androgen signaling in the limbic system have not been systematically delineated.

    Cardiovascular Biology: Play It Again, Gata4 · 2013 · DOI

  • The organizational versus activational effects of sex hormones are well-characterized in males (with estradiol's role in the perinatal period through aromatase conversion of testosterone), but equivalent mechanisms in females—particularly how the absence of sex hormone signaling permits development of female behaviors and how progesterone receptor signaling constrains adult behavioral display—require direct experimental investigation.

    Cardiovascular Biology: Play It Again, Gata4 · 2013 · DOI

  • While parallel processing streams within the VMH have been proposed to mediate specific responses to male intruders versus female mates, the precise neuron types involved in distinguishing and gating these opposing behavioral outputs (aggression versus sexual behavior in males; lordosis versus aggression in females) remain undetermined and require cell-type-specific characterization.

    Cardiovascular Biology: Play It Again, Gata4 · 2013 · DOI

  • The paper identifies progesterone receptor-expressing neurons in the ventromedial hypothalamus (VMH) as mediators of sex-specific behaviors, but the precise mechanisms by which progesterone signaling alters neuron morphology, connectivity, and neurotransmitter responsiveness during the perinatal critical period remain undetermined. Specific alterations in gene expression programs and intracellular signaling pathways required for different sex-dimorphic behaviors downstream of progesterone receptor activation need to be mapped.

    Cardiovascular Biology: Play It Again, Gata4 · 2013 · DOI

  • The process of remodelling of originally ring-like AV junction into AV node and accompanying fibrous insulation between the atria and ventricles is poorly understood, especially on the molecular level.

    Development of cardiac conduction system in mammals with a focus on the anatomical, functional and medical/genetical aspects · 2007 · DOI

  • So the question remains to be answered: what is the purpose of the ganglia? In our first work, Romberg and I expressed the belief that they are sensory organs on which fall the task of transmitting the unconscious sensations arising in the heart to the reflex centers in the cord and brain stem whence the regulation of heart movement, with the aid of the vagus and sympathetics, proceeds. The function of the heart ganglia has not been determined with certainty.

    The Activity of the Embryonic Human Heart and Its Significance for the Understanding of the Heart Movement in the Adult · 1949 · DOI

  • An open question is whether alternative protein isoforms feature different half-life than the canonical counterpart, which could indicate differential usage and functional diversification.

    Proteogenomic analysis of the differential stability of cardiac protein isoforms · 2026 · DOI

  • Congenital heart defects are highly sex-biased, and although the regulatory networks underlying the differentiation of cardiac progenitors are well established, the sex differences during early stages of cardiogenesis have been largely understudied.

    Sex chromosomes and sex hormones contribute jointly and independently to sex biases in cardiac development. · 2026 · DOI

  • Extracellular matrix components play key roles in outflow tract (OFT) and valve development, but their contribution to BAV is not fully established.

    Pathogenicity Assessment of a Bicuspid Aortic Valve Associated ELASTIN Variant Using a Zebrafish Model · 2026 · DOI

  • Neural crest cells (NCCs) are multipotent migratory cells essential for cardiac development, yet the lineage trajectories and gene regulatory networks (GRNs) underlying their differentiation in the cardiopharyngeal region remain unclear.

    Hox-Meis-relayed gene regulatory transition underlies cardiopharyngeal neural crest diversification · 2026 · DOI

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26 open questions have been extracted from the limitations and future-work passages of 128 Congenital heart defects research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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