Intellectual disability syndromic and non-syndromic
Gene: AFF3 Green List (high evidence)Green List (high evidence)
Green rating for autosomal dominant KINSSHIP syndrome (see review below) - suggested to be associated with dominant negative mechanism; all variants occur within the degron motif of the ALF domain.
Green rating for autosomal dominant and recessive neurodevelopmental disorder, a milder phenotype than KINSSHIP syndrome (PMID: 38811945).
- 10 individuals (6 families) harbour heterozygous truncating loss‑of‑function alleles, defining a milder haploinsufficiency disorder. These families lack segregation evidence for majority of families. Phenotypes include abnormal corpus callosum (4/6), developmental delay/mild-severe ID (8/8), speech impairment (7/8), hypotonia (6/7).
- 7 families possess biallelic loss‑of‑function or missense variants (missense located outside of the degron motif), leading to a recessive neurodevelopmental disorder, phenotypes include epileptic encephalopathy (1/4 but 2x individuals had abnormal sleep EEG), ID/DD (6/7), speech impairment (3/4), skeletal defects (1/4). Semi-dominant inheritance suggested due to some families have parents with milder symptoms, however, lack of complete phenotypic data available to be conclusive.Created: 20 Aug 2026, 4:05 p.m. | Last Modified: 20 Aug 2026, 4:05 p.m.
Panel Version: 2.498
Mode of inheritance
BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Phenotypes
KINSSHIP syndrome, MIM# 619297; Neurodevelopmental disorder, MONDO:0700092, AFF3-related
Publications
Green List (high evidence)
16 affected individuals reported with de novo missense variants. All variants occurred within the degron motif of the ALF domain. The highly conserved 9-amino acid motif mediates the interaction with SIAH E3 ubiquitin ligases and regulates their degradation. Thirteen of the probands carried variants affecting the same codon in exon 6, ala258.
All probands presented with severe developmental epileptic encephalopathy along with mesomelic dysplasia (12/18) and failure to thrive (14/18). The skeletal features included short forearms, radial head dislocation/subluxation, triangular and/or short tibia, fibular hypoplasia, hip dislocation, and tarsal and/or metatarsal synostosis resembling Nievergelt/Savarirayan mesomelic skeletal dysplasia. Other features included microcephaly (9/18), global brain atrophy and/or ventriculomegaly (13/15), fibular hypoplasia (12/16), horseshoe or hypoplastic kidney (13/17), abnormalities of muscle tone (12/16), gastroesophageal reflux disease (6/16), and other gastrointestinal symptoms (14/17). The patients also shared common dysmorphic facial features such as a bulbous nasal tip (10/15), a wide mouth (10/16) often with a square upper lip, abnormalities of the teeth and gums (12/15), and hypertrichosis (12/15). The constellation of features recalled some features of CHOPS syndrome, which is caused by mutations in a related gene, AFF4.Created: 12 May 2021, 7:22 p.m.
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes
KINSSHIP syndrome, MIM# 619297
Publications
Publications for gene: AFF3 were set to 31388108; 33961779
Phenotypes for gene: AFF3 were changed from KINSSHIP syndrome, MIM# 619297 to KINSSHIP syndrome, MIM# 619297; Neurodevelopmental disorder, MONDO:0700092, AFF3-related
Mode of inheritance for gene: AFF3 was changed from MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted to BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Gene: aff3 has been classified as Green List (High Evidence).
Phenotypes for gene: AFF3 were changed from to KINSSHIP syndrome, MIM# 619297
Publications for gene: AFF3 were set to
Mode of inheritance for gene: AFF3 was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
gene: AFF3 was added gene: AFF3 was added to Intellectual disability, syndromic and non-syndromic_GHQ. Sources: Expert Review Green,Genetic Health Queensland Mode of inheritance for gene: AFF3 was set to Unknown
If promoting or demoting a gene, please provide comments to justify a decision to move it.
Genes included in a Genomics England gene panel for a rare disease category (green list) should fit the criteria A-E outlined below.
These guidelines were developed as a combination of the ClinGen DEFINITIVE evidence for a causal role of the gene in the disease(a), and the Developmental Disorder Genotype-Phenotype (DDG2P) CONFIRMED DD Gene evidence level(b) (please see the original references provided below for full details). These help provide a guideline for expert reviewers when assessing whether a gene should be on the green or the red list of a panel.
A. There are plausible disease-causing mutations(i) within, affecting or encompassing an interpretable functional region(ii) of this gene identified in multiple (>3) unrelated cases/families with the phenotype(iii).
OR
B. There are plausible disease-causing mutations(i) within, affecting or encompassing cis-regulatory elements convincingly affecting the expression of a single gene identified in multiple (>3) unrelated cases/families with the phenotype(iii).
OR
C. As definitions A or B but in 2 or 3 unrelated cases/families with the phenotype, with the addition of convincing bioinformatic or functional evidence of causation e.g. known inborn error of metabolism with mutation in orthologous gene which is known to have the relevant deficient enzymatic activity in other species; existence of an animal model which recapitulates the human phenotype.
AND
D. Evidence indicates that disease-causing mutations follow a Mendelian pattern of causation appropriate for reporting in a diagnostic setting(iv).
AND
E. No convincing evidence exists or has emerged that contradicts the role of the gene in the specified phenotype.
(i)Plausible disease-causing mutations: Recurrent de novo mutations convincingly affecting gene function. Rare, fully-penetrant mutations - relevant genotype never, or very rarely, seen in controls. (ii) Interpretable functional region: ORF in protein coding genes miRNA stem or loop. (iii) Phenotype: the rare disease category, as described in the eligibility statement. (iv) Intermediate penetrance genes should not be included.
It’s assumed that loss-of-function variants in this gene can cause the disease/phenotype unless an exception to this rule is known. We would like to collect information regarding exceptions. An example exception is the PCSK9 gene, where loss-of-function variants are not relevant for a hypercholesterolemia phenotype as they are associated with increased LDL-cholesterol uptake via LDLR (PMID: 25911073).
If a curated set of known-pathogenic variants is available for this gene-phenotype, please contact us at panelapp@genomicsengland.co.uk
We classify loss-of-function variants as those with the following Sequence Ontology (SO) terms:
Term descriptions can be found on the PanelApp homepage and Ensembl.
If you are submitting this evaluation on behalf of a clinical laboratory please indicate whether you report variants in this gene as part of your current diagnostic practice by checking the box
Standardised terms were used to represent the gene-disease mode of inheritance, and were mapped to commonly used terms from the different sources. Below each of the terms is described, along with the equivalent commonly-used terms.
A variant on one allele of this gene can cause the disease, and imprinting has not been implicated.
A variant on the paternally-inherited allele of this gene can cause the disease, if the alternate allele is imprinted (function muted).
A variant on the maternally-inherited allele of this gene can cause the disease, if the alternate allele is imprinted (function muted).
A variant on one allele of this gene can cause the disease. This is the default used for autosomal dominant mode of inheritance where no knowledge of the imprinting status of the gene required to cause the disease is known. Mapped to the following commonly used terms from different sources: autosomal dominant, dominant, AD, DOMINANT.
A variant on both alleles of this gene is required to cause the disease. Mapped to the following commonly used terms from different sources: autosomal recessive, recessive, AR, RECESSIVE.
The disease can be caused by a variant on one or both alleles of this gene. Mapped to the following commonly used terms from different sources: autosomal recessive or autosomal dominant, recessive or dominant, AR/AD, AD/AR, DOMINANT/RECESSIVE, RECESSIVE/DOMINANT.
A variant on one allele of this gene can cause the disease, however a variant on both alleles of this gene can result in a more severe form of the disease/phenotype.
A variant in this gene can cause the disease in males as they have one X-chromosome allele, whereas a variant on both X-chromosome alleles is required to cause the disease in females. Mapped to the following commonly used term from different sources: X-linked recessive.
A variant in this gene can cause the disease in males as they have one X-chromosome allele. A variant on one allele of this gene may also cause the disease in females, though the disease/phenotype may be less severe and may have a later-onset than is seen in males. X-linked inactivation and mosaicism in different tissues complicate whether a female presents with the disease, and can change over their lifetime. This term is the default setting used for X-linked genes, where it is not known definitately whether females require a variant on each allele of this gene in order to be affected. Mapped to the following commonly used terms from different sources: X-linked dominant, x-linked, X-LINKED, X-linked.
The gene is in the mitochondrial genome and variants within this can cause this disease, maternally inherited. Mapped to the following commonly used term from different sources: Mitochondrial.
Mapped to the following commonly used terms from different sources: Unknown, NA, information not provided.
For example, if the mode of inheritance is digenic, please indicate this in the comments and which other gene is involved.