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Mendeliome v1.426 SP6 Zornitza Stark Phenotypes for gene: SP6 were changed from hypoplastic amelogenesis imperfecta to Amelogenesis imperfecta, type IK, MIM# 620104
Mendeliome v1.425 SP6 Zornitza Stark edited their review of gene: SP6: Changed phenotypes: Amelogenesis imperfecta, type IK, MIM# 620104
Mendeliome v0.14256 WDR36 Zornitza Stark changed review comment from: Multiple individuals reported.

However, note one of the earliest reported variants p.Asp658Gly is present in >1,000 individuals in gnomad, and another, p.Ala449Thr is present in >2000.; to: Multiple individuals reported. Adult-onset.

However, note one of the earliest reported variants p.Asp658Gly is present in >1,000 individuals in gnomad, and another, p.Ala449Thr is present in >2000.
Mendeliome v0.14256 WDR36 Zornitza Stark changed review comment from: Multiple individuals reported.

However, note one of the earliest reported variants p.Asp658Gly is present in >1,000 individuals in gnomad.; to: Multiple individuals reported.

However, note one of the earliest reported variants p.Asp658Gly is present in >1,000 individuals in gnomad, and another, p.Ala449Thr is present in >2000.
Mendeliome v0.13809 DUSP6 Zornitza Stark Marked gene: DUSP6 as ready
Mendeliome v0.13809 DUSP6 Zornitza Stark Gene: dusp6 has been classified as Red List (Low Evidence).
Mendeliome v0.13809 DUSP6 Zornitza Stark Phenotypes for gene: DUSP6 were changed from to Hypogonadotropic hypogonadism 19 with or without anosmia - MIM#615269
Mendeliome v0.13808 DUSP6 Zornitza Stark Publications for gene: DUSP6 were set to
Mendeliome v0.13807 DUSP6 Zornitza Stark Mode of inheritance for gene: DUSP6 was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.13806 DUSP6 Zornitza Stark Classified gene: DUSP6 as Red List (low evidence)
Mendeliome v0.13806 DUSP6 Zornitza Stark Gene: dusp6 has been classified as Red List (Low Evidence).
Mendeliome v0.13683 DUSP6 Krithika Murali changed review comment from: PMID: 23643382 Miraoui et al 2013 - - candidate gene study for genes in the FGFR1 pathway that may be associated with CHH, either as causative genes or disease modifiers. A cohort of 386 CHH individuals and 155 unaffected controls of European descent. A number of affected individuals included in this cohort already had known causative variants in CHH-associated genes. The coding exons and proximal introns (≥15 bp from splice sites) of FGF17, FGF18, IL17RD, DUSP6, SPRY2, SPRY4, and FLRT3 were amplified by PCR and determined by direct sequencing.

Summary of DUSP6 variants identified in this study
c.229 T>A p.(Phe77Ile) - absent gnomAD v2 and v3
c.545C>T p.(Ser182Phe) - 203 hets gnomad v2, 137 hets and 1 hom - v3 - identified in conjunction with FGFR1 variant in this individual
c.566A>G p.Asn189Ser - v2 57 hets, v3 29 hets (another individual identified with this variant and an SPRY4 variant)
c.1037C>T p.Thr346Met - 81 hets v2, 27 hets and 1 hom v3 (identified in conjunction with SPRY4 variant

No segregation information provided.

PMID: 23643382 - Dusp6 null mouse model reportedly has craniofacial defects and hearing defects, but no mention of hypogonadotropic hypogonadism. In 5 unrelated individuals with congenital hypogonadotropic hypogonadism 4 heterozygous missense were identified. In 3 of the probands, the DUSP6 mutation was accompanied by a heterozygous missense mutation in another HH-associated gene. 3 of the 4 variants have subpopulation allele frequencies in gnomAD v2.1 that are higher than expected for a dominant condition: p.Thr346Met (AJ AF 0.002797), p.Ser182Phe (NFE AF 0.001396), p.Asn189Ser (NFE AF 0.0003641). No functional assays were conducted.

PMID: 32389901 - 6 unrelated male Chinese Kallman syndrome cases with 4 DUSP6 missense variants. 2 of 4 variants have East Asian allele frequencies in gnomAD v2.1 that are higher than expected for a dominant condition: p.Pro188Leu (EAS AF 0.001203), p.Arg83Gln (EAS AF 0.001129). No functional assays conducted.; to: PMID: 23643382 Miraoui et al 2013 - - candidate gene study for genes in the FGFR1 pathway that may be associated with CHH, either as causative genes or disease modifiers. A cohort of 386 CHH individuals and 155 unaffected controls of European descent. A number of affected individuals included in this cohort already had known causative variants in CHH-associated genes. The coding exons and proximal introns (≥15 bp from splice sites) of FGF17, FGF18, IL17RD, DUSP6, SPRY2, SPRY4, and FLRT3 were amplified by PCR and determined by direct sequencing.

Summary of DUSP6 variants identified in this study
c.229 T>A p.(Phe77Ile) - absent gnomAD v2 and v3
c.545C>T p.(Ser182Phe) - 203 hets gnomad v2, 137 hets and 1 hom - v3 - identified in conjunction with FGFR1 variant in this individual
c.566A>G p.Asn189Ser - v2 57 hets, v3 29 hets (another individual identified with this variant and an SPRY4 variant)
c.1037C>T p.Thr346Met - 81 hets v2, 27 hets and 1 hom v3 (identified in conjunction with SPRY4 variant

No segregation information provided. Dusp6 null mouse model reportedly has craniofacial defects and hearing defects, but no mention of hypogonadotropic hypogonadism.

PMID: 32389901 - 6 unrelated male Chinese Kallman syndrome cases with 4 DUSP6 missense variants. 2 of 4 variants have East Asian allele frequencies in gnomAD v2.1 that are higher than expected for a dominant condition: p.Pro188Leu (EAS AF 0.001203), p.Arg83Gln (EAS AF 0.001129). No functional assays conducted.
Mendeliome v0.13683 DUSP6 Krithika Murali changed review comment from: 1 study cited by OMIM (Miraoui et al 2013) - heterozygous variants in 5 unrelated individuals with congenital hypogonadotrophic hypogonadism (CHH). 4/5 variants highly prevalent in healthy population and/or in conjunction with variants in other genes either known to be associated with CHH or possibly associated. No additional studies published since this paper.

PMID: 23643382 Miraoui et al 2013 - - candidate gene study for genes in the FGFR1 pathway that may be associated with CHH, either as causative genes or disease modifiers. A cohort of 386 CHH individuals and 155 unaffected controls of European descent. A number of affected individuals included in this cohort already had known causative variants in CHH-associated genes. The coding exons and proximal introns (≥15 bp from splice sites) of FGF17, FGF18, IL17RD, DUSP6, SPRY2, SPRY4, and FLRT3 were amplified by PCR and determined by direct sequencing.

Summary of DUSP6 variants identified in this study
c.229 T>A p.(Phe77Ile) - absent gnomAD v2 and v3
c.545C>T p.(Ser182Phe) - 203 hets gnomad v2, 137 hets and 1 hom - v3 - identified in conjunction with FGFR1 variant in this individual
c.566A>G p.Asn189Ser - v2 57 hets, v3 29 hets (another individual identified with this variant and an SPRY4 variant)
c.1037C>T p.Thr346Met - 81 hets v2, 27 hets and 1 hom v3 (identified in conjunction with SPRY4 variant

No segregation information provided.; to: PMID: 23643382 Miraoui et al 2013 - - candidate gene study for genes in the FGFR1 pathway that may be associated with CHH, either as causative genes or disease modifiers. A cohort of 386 CHH individuals and 155 unaffected controls of European descent. A number of affected individuals included in this cohort already had known causative variants in CHH-associated genes. The coding exons and proximal introns (≥15 bp from splice sites) of FGF17, FGF18, IL17RD, DUSP6, SPRY2, SPRY4, and FLRT3 were amplified by PCR and determined by direct sequencing.

Summary of DUSP6 variants identified in this study
c.229 T>A p.(Phe77Ile) - absent gnomAD v2 and v3
c.545C>T p.(Ser182Phe) - 203 hets gnomad v2, 137 hets and 1 hom - v3 - identified in conjunction with FGFR1 variant in this individual
c.566A>G p.Asn189Ser - v2 57 hets, v3 29 hets (another individual identified with this variant and an SPRY4 variant)
c.1037C>T p.Thr346Met - 81 hets v2, 27 hets and 1 hom v3 (identified in conjunction with SPRY4 variant

No segregation information provided.

PMID: 23643382 - Dusp6 null mouse model reportedly has craniofacial defects and hearing defects, but no mention of hypogonadotropic hypogonadism. In 5 unrelated individuals with congenital hypogonadotropic hypogonadism 4 heterozygous missense were identified. In 3 of the probands, the DUSP6 mutation was accompanied by a heterozygous missense mutation in another HH-associated gene. 3 of the 4 variants have subpopulation allele frequencies in gnomAD v2.1 that are higher than expected for a dominant condition: p.Thr346Met (AJ AF 0.002797), p.Ser182Phe (NFE AF 0.001396), p.Asn189Ser (NFE AF 0.0003641). No functional assays were conducted.

PMID: 32389901 - 6 unrelated male Chinese Kallman syndrome cases with 4 DUSP6 missense variants. 2 of 4 variants have East Asian allele frequencies in gnomAD v2.1 that are higher than expected for a dominant condition: p.Pro188Leu (EAS AF 0.001203), p.Arg83Gln (EAS AF 0.001129). No functional assays conducted.
Mendeliome v0.13682 DUSP6 Krithika Murali reviewed gene: DUSP6: Rating: RED; Mode of pathogenicity: None; Publications: 23643382; Phenotypes: Hypogonadotropic hypogonadism 19 with or without anosmia - MIM#615269; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.8829 ARF3 Zornitza Stark gene: ARF3 was added
gene: ARF3 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: ARF3 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: ARF3 were set to 34346499
Phenotypes for gene: ARF3 were set to Global developmental delay; Intellectual disability; Seizures; Morphological abnormality of the central nervous system
Review for gene: ARF3 was set to AMBER
Added comment: Sakamoto et al (2021 - PMID: 34346499) provide some evidence that monoallelic ARF3 pathogenic variants may be associated with a NDD with brain abnormality.

Using trio exome sequencing, the authors identified 2 individuals with NDD harboring de novo ARF3 variants, namely: NM_001659.2:c.200A>T / p.Asp67Val and c.296G>T / p.Arg99Leu.

Individual 1 (with Asp67Val / age : 4y10m), appeared to be more severelely affected with prenatal onset progressive microcephaly, severe global DD, epilepsy. Upon MRI there was cerebellar and brainstem atrophy. Individual 2 (Arg99Leu / 14y) had severe DD and ID (IQ of 23), epilepsy and upon MRI cerebellar hypoplasia. This subject did not exhibit microcephaly. Common facial features incl. broad nose, full cheeks, small philtrum, strabismus, thin upper lips and abnormal jaw. There was no evidence of systemic involvement in both.

ARF3 encodes ADP-ribosylation factor 3. Adenosine diphosphate ribosylation factors (ARFs) are key proteins for regulation of cargo sorting at the Golgi network, with ARF3 mainly working at the trans-Golgi network. ARFs belong to the small GTP-binding protein (G protein) superfamily. ARF3 switches between an active GTP-bound form and an inactive GDP-bound form, regulated by guanine nucleotide exchange factors (GEFs) and GTPase activating proteins (GAPs) respectively.

Members of the ARF superfamily regulate various aspects of membrane traffic, among others in neurons.

There are 5 homologs of ARF families, divided in 3 classes. ARF3 and ARF1 belong to class I. Monoallelic ARF1 mutations are associated with Periventricular nodular heterotopia 8 (MIM 618185).

In vivo, in vitro and in silico studies for the 2 variants suggest that both impair the Golgi transport system although each variant most likely exerts a different effect (gain-of-function for Arg99Leu vs loss-of-function/dominant-negative for Asp67Val).

This was also reflected in somewhat different phenotype of the subjects with the respective variants. Common features included severe DD, epilepsy and brain abnormalities although Asp67Val was associated with diffuse brain atrophy as well as congenital microcephaly and Arg99Leu with cerebellar hypoplasia.

Evidence to support the effect of each variant include:

Arg99Leu:
Had identical Golgi localization to that of wt
Had increased binding activity with GGA1, a protein recruited by the GTP-bound active form of ARF3 to the TGN membrane (supporting GoF)
In silico structural analysis suggested it may fail to stabilize the conformation of Asp26, resulting in impaired GTP hydrolysis (GoF).
In transgenic fruit flies, evaluation of the ARF3 variant toxicity using the rough eye phenotype this variant was associated with increased severity of the r-e phenotype similar to a previously studied GoF variant (Gln71Leu)

Asp67Val:
Did not show a Golgi-like pattern of localization (similar to Thr31Asn a previously studied dominant-negative variant)
Displayed decreased protein stability
In silico structural analysis suggested that Asp67Val may lead to compromised binding of GTP or GDP (suggestive of LoF)
In transgenic Drosophila eye-specific expression of Asp67Val (similar to Thr31Asn, a known dominant-negative variant) was lethal possibly due to high toxicity in very small amounts in tissues outside the eye.

There is no associated phenotype in OMIM, G2P or SysID.
Sources: Literature
Mendeliome v0.8806 SP6 Zornitza Stark Publications for gene: SP6 were set to 32167558; 18156176; 18297738; 22676574
Mendeliome v0.8805 SP6 Zornitza Stark Mode of inheritance for gene: SP6 was changed from MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.8804 SP6 Zornitza Stark Classified gene: SP6 as Green List (high evidence)
Mendeliome v0.8804 SP6 Zornitza Stark Gene: sp6 has been classified as Green List (High Evidence).
Mendeliome v0.8803 SP6 Zornitza Stark reviewed gene: SP6: Rating: GREEN; Mode of pathogenicity: None; Publications: 33652941; Phenotypes: Hypoplastic amelogenesis imperfecta; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.3186 SP6 Zornitza Stark Marked gene: SP6 as ready
Mendeliome v0.3186 SP6 Zornitza Stark Gene: sp6 has been classified as Amber List (Moderate Evidence).
Mendeliome v0.3186 SP6 Zornitza Stark Classified gene: SP6 as Amber List (moderate evidence)
Mendeliome v0.3186 SP6 Zornitza Stark Gene: sp6 has been classified as Amber List (Moderate Evidence).
Mendeliome v0.3185 SP6 Eleanor Williams gene: SP6 was added
gene: SP6 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: SP6 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Publications for gene: SP6 were set to 32167558; 18156176; 18297738; 22676574
Phenotypes for gene: SP6 were set to hypoplastic amelogenesis imperfecta
Review for gene: SP6 was set to AMBER
Added comment: PMID: 32167558 - Smith et al 2020 - report a 2 bp variant c.817_818GC>AA in SP6 in a Caucasian family with autosomal dominant hypoplastic AI which results in a missense change. Report that mice and rat knockouts also show a dental phenotype (PMID: 18156176, 18297738, 22676574 )
Sources: Literature
Mendeliome v0.0 DUSP6 Zornitza Stark gene: DUSP6 was added
gene: DUSP6 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: DUSP6 was set to Unknown