NSD1 rs587784158: Sotos Syndrome and Variant Details
The genetic variant rs587784158 is a rare sequence alteration located within the NSD1 gene on chromosome 5. Pathogenic loss-of-function variants in this gene are established causes of Sotos syndrome, an overgrowth and neurodevelopmental condition. Because this variant impairs critical histone-modifying functions during development, it carries significant clinical importance when detected.
What each genotype means
Typical NSD1 gene profile
This genotype represents the common, functional version of the NSD1 gene. It is not associated with the loss-of-function changes that characterize Sotos syndrome.
This is the most common genotype found in the general population.
Rare NSD1 variant carrier
This genotype indicates the presence of a rare variant in the NSD1 gene. Because pathogenic loss-of-function variants in this gene are linked to Sotos syndrome, this finding should be discussed with a clinical geneticist to determine if it is clinically significant or a benign variation.
This specific genotype is extremely rare, with an allele frequency reported as less than 0.00001 in large population databases like gnomAD.
Rare NSD1 variant homozygous
This genotype indicates that both copies of the NSD1 gene carry this rare variant. Given that NSD1 mutations are associated with Sotos syndrome, this result requires professional clinical evaluation to assess its potential impact on health and development.
This genotype is exceptionally rare and is not typically observed in the general population.
Genomic Context and the NSD1 Gene
The variant rs587784158 resides within the nuclear receptor binding SET domain protein 1 (NSD1) gene, mapped to the chromosomal region 5q35. The NSD1 gene encodes an epigenetic enzyme known as a histone methyltransferase, specifically responsible for depositing methyl marks on histone H3 lysine 36 (H3K36). Histones act as structural spools around which genomic DNA is coiled, and biochemical modifications like methylation determine how tightly DNA is packaged, essentially switching regulatory regions and developmental genes on or off. By orchestrating genome-wide chromatin accessibility and working in concert with DNA methylation machinery, the NSD1 protein governs vital programs of cellular differentiation, skeletal elongation, and early brain development.
Clinical Significance and Disease Association
In medical genetics, loss-of-function variants in the NSD1 gene are the primary cause of Sotos syndrome, an autosomal dominant overgrowth and intellectual disability condition. Sotos syndrome is clinically characterized by a distinctive facial appearance, childhood overgrowth with macrocephaly (an unusually large head circumference), and variable degrees of learning difficulties or developmental delay. Experimental and clinical sequencing data compiled in public archives such as ClinVar demonstrate that truncating, frameshift, or critical missense alterations that reduce active NSD1 protein output disrupt downstream developmental transcription. While evidence linking loss-of-function NSD1 disruption to Sotos syndrome is strong and well-replicated, the specific physical features, learning needs, and medical nuances can vary noticeably among individuals carrying causative variants.
Population Frequency and Inheritance Patterns
According to broad population sequencing initiatives like the Genome Aggregation Database (gnomAD), the rs587784158 variant is extraordinarily rare, presenting an allele frequency below 0.00001 across global reference ancestries. This extreme scarcity aligns with severe, dominant developmental conditions where pathogenic alleles are subject to strong negative selective pressure. In clinical cohorts, approximately 95 percent of pathogenic NSD1 alterations arise as spontaneous, 'de novo' mutations in an egg or sperm cell rather than being inherited from an affected parent. When an individual does carry an autosomal dominant NSD1 alteration, there is a 50 percent statistical probability of passing that variant to their offspring in each pregnancy.
Interpreting Results and Clinical Follow-Up
Identifying a rare sequence variant such as rs587784158 requires careful clinical interpretation. Direct-to-consumer genotyping arrays frequently experience technical artifacts or false positives when probing extremely rare variants, meaning any unexpected finding must be confirmed via certified clinical sequencing, such as Sanger sequencing or targeted gene panels. Furthermore, genetic variant classification is dynamic and relies on rigorous ACMG/AMP clinical guidelines. Individuals with questions about a genetic report indicating an NSD1 alteration should consult a clinical geneticist or certified genetic counselor. These healthcare professionals can evaluate clinical features, coordinate diagnostic-grade confirmatory testing, and help formulate appropriate developmental or pediatric surveillance plans if necessary.
How common is this variant?
The rs587784158 variant is exceedingly rare in the general population, showing an allele frequency of less than 0.00001 in large genomic datasets like gnomAD.
Frequently asked questions
What is Sotos syndrome?
Sotos syndrome is a rare genetic disorder characterized by excessive growth during childhood, distinct facial characteristics, macrocephaly, and neurodevelopmental differences such as speech or motor delays. It is most commonly caused by loss-of-function changes in the NSD1 gene.
How is the rs587784158 variant inherited?
Alterations in NSD1 are inherited in an autosomal dominant manner, meaning a single altered copy can produce the phenotype. However, around 95% of Sotos syndrome cases are de novo, meaning the mutation occurs spontaneously and was not inherited from either parent.
Can commercial consumer DNA tests reliably detect rs587784158?
Consumer DNA tests often utilize microarray chips that have high error and false-positive rates for extremely rare variants. Any finding involving a pathogenic or rare variant like rs587784158 must be independently verified by a clinical diagnostic laboratory.
What should I do if a genetic report shows this variant?
You should bring the results to a licensed genetic counselor or medical geneticist for evaluation. They will review your medical history, assess whether the variant aligns with any physical findings, and order clinical-grade confirmatory testing if needed.
Sources & further reading
Educational information only, last refreshed 9/7/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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