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Background Genetic testing has become more complex with the transition from single gene testing to multi-gene panels and whole-exome sequencing. The adoption of more complex genetic testing and the promise of precision medicine has created a critical and urgent need for longitudinal clinical follow-up with patients who undergo cancer genetic testing given the residual uncertainty. There is an increasing need for multidisciplinary translational research that focuses on how to advance precision medicine discoveries into clinical practice and to capitalize on connectivity (e.g. digital health) interventions in ways that optimize cancer risk reducing behaviors in real-world clinical populations. Methods The overall goal of this Hybrid Type 1 effectiveness-implementation randomized study is to evaluate the effectiveness of the MyCancerGene intervention to improve longitudinal (short-term and long-term) understanding (e.g. knowledge) and reactions to (e.g. anxiety) clinical genetic testing compared to usual care. We hypothesize that access to MyCancerGene will be associated with short-term and post-disclosure increases in knowledge, decreases in distress, increases in communication with relatives and health care providers and performance of risk reducing health behaviors compared to usual care. Equally important, we hypothesize that our implementation process evaluation will inform recommendations for future adaptation and sustainability for other precision medicine applications. Discussion Given the increasing complexity of genetic testing applications (e.g. multi-gene testing, whole exome sequencing) and the need for post-disclosure follow-up, we expect this study to inform evidence-based practice guidelines for delivery of genetic medicine and potentially change the paradigm to include longitudinal care in precision medicine. To address the clinically significant gap in the delivery of genetic medicine, patient and provider stakeholder input have been used to develop a patient and provider informed centered genetic digital health portal to enhance patient understanding of, and affective and behavioral responses to genetic testing, particularly in the era of evolving evidence and risk information. Trial registration This protocol was registered at clinicaltrials.gov (NCT04774445) in February 18, 2021.

Germline BRCA1 and BRCA2 testing is a standard evidence-based practice, with established risk reduction and cancer screening guidelines for genetic carriers. With Food and Drug Administration approval for poly (adenosine diphosphate ribose) polymerase (PARP) inhibitors in patients with metastatic breast, ovarian, pancreatic, and prostate cancer, there is an additional therapeutic rationale for testing all patients with these cancers for germline BRCA1 and BRCA2 mutations. However, many at-risk patients do not have access to genetic services, leaving many genetic carriers unidentified. The eREACH (A Randomized Study of an eHealth Delivery Alternative for Cancer Genetic Testing for Hereditary Predisposition in Metastatic Breast, Ovarian, Prostate, and Pancreatic Cancer Patients) study evaluates the effectiveness of a theoretically and stakeholder-informed eHealth (eg, digital) delivery alternative to traditional genetic counseling for patients with metastatic breast or prostate cancer or advanced or metastatic ovarian or pancreatic cancer referred for genetic testing to determine whether they are candidates for a PARP inhibitor. The eREACH study is a randomized noninferiority study using a 2 × 2 design to test a self-directed digital intervention to deliver clinical genetic testing for patients with metastatic cancers. The traditional standard-of-care pretest (visit 1) and posttest (visit 2-disclosure) counseling delivered by a genetic counselor is replaced with our patient-informed digital intervention. The four arms were as follows: arm A, genetic counselor for visits 1 and 2; arm B, genetic counselor for visit 1 and digital intervention for visit 2; arm C, digital intervention for visit 1 and genetic counselor for visit 2; and arm D, digital intervention for both visits. Participants were adults with advanced or metastatic breast, ovarian, pancreatic, and prostate cancer. The primary outcomes of this study were change in genetic knowledge and anxiety from baseline to postdisclosure assessment. We will test whether the digital intervention is noninferior to standard-of-care counseling with a genetic counselor using a modified noninferiority ANOVA of the posttest disclosure minus baseline change scores. In secondary analyses, we will test pairwise differences among the 4 groups. As of January 2025, we have completed enrollment of 229 participants. Data analysis is ongoing, and we expect the results to be published in 2025. Increasing indications for BRCA1 and BRCA2 testing create a pressing need to evaluate alternative delivery models to increase access and uptake of these tests while maintaining adequate patient cognitive, affective, and behavioral outcomes. The eREACH study evaluates the effectiveness of an interactive, patient-centered digital intervention to deliver clinical genetic testing to patients with metastatic cancers. We expect that this work will inform evidence-based guidelines and the standard of care for delivery of genetic testing, and it is designed to be broadly applicable and easily adaptable for other populations and settings even beyond oncology. ClinicalTrials.gov NCT04353973; https://clinicaltrials.gov/study/NCT04353973. DERR1-10.2196/72515.

The use of multigene panels has significantly increased the likelihood that genetic testing will leave patients with uncertainties regarding test interpretation, implications, and recommendations, which will change over time. Effective longitudinal care models are needed to provide patients with updated information and to obtain patient and family history updates. To bridge this gap, we aimed to develop a patient- and genetic provider-informed digital genetic health portal (GHP), MyCancerGene, to improve longitudinal patient understanding of and responses to genetic testing. We used a 5-step process to develop MyCancerGene. To better understand their interest in and willingness to use a digital GHP, we surveyed 307 patients who completed genetic testing (step 1). We completed qualitative interviews with 10 patients and a focus group with 17 genetic providers to inform the content and function of MyCancerGene (step 2). Next, we developed initial intervention content (step 3) and completed user testing of intervention content with 25 providers and 28 patients (step 4). After developing the prototype intervention, we completed usability testing with 8 patients for their feedback on the final content, functions, and ease of use (step 5). In surveys conducted in step 1, 90% of patients with positive results reported interest in a digital GHP, and over 75% of participants with variants of uncertain significance or uninformative negative results reported similar interest. The most frequently reported advantages among patients were increasing accessibility, convenience, and efficiency (103/224, 46%); keeping genetic information organized (54/224, 24.1%); and increasing or maintaining patient understanding of the information (38/224, 17%). In qualitative interviews (step 2), both patients and genetic providers endorsed the benefit of the tool for updating personal and family history and for providers to share new risk information, test interpretation, or other medical changes. Patient and provider input informed eight key components of the tool: (1) Landing Page, (2) Summary of Care page, (3) My Genetic Test Results page, (4) My Family History page, (5) Provide an Update page, (6) Review an Update page, (7) Resources page, and (8) the Screenings Tracker. They also recommended key functions, including the ability to download and print materials and the inclusion of reminders and engagement functions. Potential challenges identified by patients included privacy and security concerns (67/206, 32.5%) and the potential for electronic information to generate distress (20/206, 9.7%). While patients were comfortable with updates (ie, even variant reclassification upgrades or clinically significant results), 44% (11/25) of genetic providers were uncomfortable sharing variant reclassification upgrades through MyCancerGene. MyCancerGene, a patient-centered digital GHP, was developed with extensive patient and genetic provider feedback and designed to enhance longitudinal patient understanding of and affective and behavioral responses to genetic testing, particularly in the era of evolving evidence and risk information.

Amyotrophic lateral sclerosis (ALS) is a devastating, rapidly progressive disease leading to paralysis and death. Recently, intermediate length polyglutamine (polyQ) repeats of 27-33 in ATAXIN-2 (ATXN2), encoding the ATXN2 protein, were found to increase risk for ALS. In ATXN2, polyQ expansions of ≥ 34, which are pure CAG repeat expansions, cause spinocerebellar ataxia type 2. However, similar length expansions that are interrupted with other codons, can present atypically with parkinsonism, suggesting that configuration of the repeat sequence plays an important role in disease manifestation in ATXN2 polyQ expansion diseases. Here we determined whether the expansions in ATXN2 associated with ALS were pure or interrupted CAG repeats, and defined single nucleotide polymorphisms (SNPs) rs695871 and rs695872 in exon 1 of the gene, to assess haplotype association. We found that the expanded repeat alleles of 40 ALS patients and 9 long-repeat length controls were all interrupted, bearing 1-3 CAA codons within the CAG repeat. 21/21 expanded ALS chromosomes with 3CAA interruptions arose from one haplotype (GT), while 18/19 expanded ALS chromosomes with <3CAA interruptions arose from a different haplotype (CC). Moreover, age of disease onset was significantly earlier in patients bearing 3 interruptions vs fewer, and was distinct between haplotypes. These results indicate that CAG repeat expansions in ATXN2 associated with ALS are uniformly interrupted repeats and that the nature of the repeat sequence and haplotype, as well as length of polyQ repeat, may play a role in the neurological effect conferred by expansions in ATXN2.

The causes of amyotrophic lateral sclerosis (ALS), a devastating human neurodegenerative disease, are poorly understood, although the protein TDP-43 has been suggested to have a critical role in disease pathogenesis. Here we show that ataxin 2 (ATXN2), a polyglutamine (polyQ) protein mutated in spinocerebellar ataxia type 2, is a potent modifier of TDP-43 toxicity in animal and cellular models. ATXN2 and TDP-43 associate in a complex that depends on RNA. In spinal cord neurons of ALS patients, ATXN2 is abnormally localized; likewise, TDP-43 shows mislocalization in spinocerebellar ataxia type 2. To assess the involvement of ATXN2 in ALS, we analysed the length of the polyQ repeat in the ATXN2 gene in 915 ALS patients. We found that intermediate-length polyQ expansions (27–33 glutamines) in ATXN2 were significantly associated with ALS. These data establish ATXN2 as a relatively common ALS susceptibility gene. Furthermore, these findings indicate that the TDP-43–ATXN2 interaction may be a promising target for therapeutic intervention in ALS and other TDP-43 proteinopathies. Genetic risk factors for ALS Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is a common adult-onset neurodegenerative disease for which there is no cure. ALS is mostly sporadic but approximately 10% of cases have a familial component, most commonly the SOD1 (superoxide dismutase) gene. Yet SOD1 mutations account for only about 2% of cases in total, so the search for further ALS risk factors continues. The protein TDP-43 is thought to play a role — as yet undetermined — in ALS pathogenesis, and Elden et al . show that ataxin-2, a polyglutamine (polyQ) protein mutated in spinocerebellar ataxia type 2, is a potent modifier of TDP-43 toxicity in animal and cellular models. Analysis of DNA from 915 individuals shows ATXN2 to be a relatively common ALS susceptibility gene, accounting for up to 4.7% of ALS cases. These findings point to the TDP-43/ataxin-2 interaction as a possible target for therapeutic intervention. The causes of the neurodegenerative disease amyotrophic lateral sclerosis (ALS) are poorly understood, although the protein TDP-43 seems to be involved. These authors show that the polyglutamine-containing protein ataxin 2 interacts with TDP-43 and is a potent modifier of TDP-43 toxicity. Moreover, intermediate-length polyglutamine expansions in the ataxin 2 gene significantly associate with ALS. These data establish the ataxin 2 gene as a new and relatively common ALS disease susceptibility gene.

TMEM106B has recently been identified as a genetic risk factor for frontotemporal lobar degeneration with TDP-43 inclusions (FTLD-TDP). Amyotrophic lateral sclerosis (ALS), like FTLD-TDP, is characterized by pathological TDP-43 inclusions. We therefore investigated whether FTLD-TDP-associated risk genotypes at TMEM106B (1) contribute to risk of developing ALS or (2) modify the clinical presentation in ALS. Detailed clinical and pathological information from 61 postmortem ALS patients was collected by database query, retrospective chart review, and histopathological slide review. DNA from these patients, as well as 24 additional ALS patients, was genotyped for three TMEM106B single nucleotide polymorphisms known to confer increased risk of FTLD-TDP. Associations between TMEM106B genotype and ALS were investigated by comparing TMEM106B genotypes in ALS patients ( n  = 85) and normal controls ( n  = 553), and associations between TMEM106B genotype and clinical and pathologic features were explored using linear regression. Multivariate linear models were used to evaluate the contributions of TMEM106B genotype and TDP-43 pathology to cognitive performance in ALS as measured by a phonemic verbal fluency test. We found that TMEM106B genotypes did not differ between ALS patients and normal controls. However, protective alleles at TMEM106B were significantly associated with preserved cognition in ALS patients, with the strongest association seen under a major-allele-dominant genetic model. While lower TDP-43 pathology scores and protective alleles at TMEM106B both correlated with better cognitive scores, these factors were not correlated with each other and demonstrated independent effects. These findings implicate the FTLD-TDP risk gene TMEM106B in the development of cognitive impairment in ALS.

Amyotrophic lateral sclerosis (ALS) is a devastating and universally fatal neurodegenerative disease. Mutations in two related RNA-binding proteins, TDP-43 and FUS, that harbor prion-like domains, cause some forms of ALS. There are at least 213 human proteins harboring RNA recognition motifs, including FUS and TDP-43, raising the possibility that additional RNA-binding proteins might contribute to ALS pathogenesis. We performed a systematic survey of these proteins to find additional candidates similar to TDP-43 and FUS, followed by bioinformatics to predict prion-like domains in a subset of them. We sequenced one of these genes, TAF15, in patients with ALS and identified missense variants, which were absent in a large number of healthy controls. These disease-associated variants of TAF15 caused formation of cytoplasmic foci when expressed in primary cultures of spinal cord neurons. Very similar to TDP-43 and FUS, TAF15 aggregated in vitro and conferred neurodegeneration in Drosophila, with the ALS-linked variants having a more severe effect than wild type. Immunohistochemistry of postmortem spinal cord tissue revealed mislocalization of TAF15 in motor neurons of patients with ALS. We propose that aggregation-prone RNA-binding proteins might contribute very broadly to ALS pathogenesis and the genes identified in our yeast functional screen, coupled with prion-like domain prediction analysis, now provide a powerful resource to facilitate ALS disease gene discovery.

Mutations in NIPA1 (non-imprinted in Prader–Willi/Angelman syndrome) have been described as a cause of autosomal dominant hereditary spastic paraplegia (HSP) known as SPG6 (spastic paraplegia-6). We present the first neuropathological description of a patient with a NIPA1 mutation, and clinical phenotype of complicated HSP with motor neuron disease-like syndrome and cognitive decline. Postmortem examination revealed degeneration of lateral corticospinal tracts and dorsal columns with motor neuron loss. TDP-43 immunostaining showed widespread spinal cord and cerebral skein-like and round neuronal cytoplasmic inclusions. We ruled out NIPA1 mutations in 419 additional cases of motor neuron disease. These findings suggest that hereditary spastic paraplegia due to NIPA1 mutations could represent a TDP-43 proteinopathy.

The most common genetic contributor to late-onset Parkinson disease (PD) is the LRRK2 gene. In order to effectively integrate LRRK2 genetic testing into clinical practice, a strategy tailored to the PD population must be developed. We assessed 168 individuals with PD for baseline knowledge of genetics, perceived risk, and interest and opinions regarding genetic counseling and testing. Most participants felt that they were familiar with general genetics terms but overall knowledge levels were low, with an average score of 55%. The majority of participants thought it was likely they inherited a PD gene (72%), believed genetic testing for PD would be useful (86%), and were interested in genetic testing (59%) and genetic counseling (56%). However, only a few participants had heard of any genetic tests for PD (29%) or LRRK2 (10%). There appears to be a significant level of interest in genetics and genetic testing within the PD population, but a considerable deficit in genetics knowledge and an over-estimation of risk. Genetic education and counseling tools to address these needs were developed to provide patients with the ability to make informed and knowledgeable genetic testing decisions.

Gaucher disease carrier screening is controversial in the medical community. The goal of this study was to explore current Gaucher disease carrier screening practices of prenatal healthcare providers. Prenatal healthcare providers were invited by email to complete an electronic-based survey. A total of 1,454 prenatal healthcare providers, including 209 genetic counselors, 450 midwives, and 795 physicians, completed the study. The majority of genetic counselors (n = 208/209, >99%), physicians (n = 415/450, 92%), and midwives (n = 634/795, 80%) currently offer Jewish ancestry disease carrier screening to couples in whom one or both partners are Jewish. Of providers who offer Jewish ancestry disease screening, the majority of genetic counselors (n = 199/208, 96%) and physicians (n = 352/415, 85%) always or sometimes offer Gaucher disease screening whereas the majority of midwives (n = 357/634, 56%) never offer Gaucher disease screening. This study presents the first report of Gaucher disease carrier screening practices of the prenatal healthcare providers in North America. Our results indicate that Gaucher disease carrier screening is being offered at a high rate within the scope of Jewish ancestry-based carrier screening. This may highlight a need to move away from the debate as to whether Gaucher disease carrier screening should be offered and, instead, focus on how best to provide Gaucher disease carrier screening services. Genet Med 2012:14(10):844–851