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Skeletal dysplasia v1.68 SMS chirag patel Marked gene: SMS as ready
Skeletal dysplasia v1.68 SMS chirag patel Gene: sms has been classified as Green List (High Evidence).
Skeletal dysplasia v1.68 chirag patel Copied gene SMS from panel Mendeliome
Skeletal dysplasia v1.68 SMS chirag patel gene: SMS was added
gene: SMS was added to Skeletal dysplasia. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: SMS was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females
Publications for gene: SMS were set to 30237987; 34177437; 32838743; 23805436
Phenotypes for gene: SMS were set to Intellectual developmental disorder, X-linked syndromic, Snyder-Robinson type, MIM# 309583; Syndromic X-linked intellectual disability Snyder type, MONDO:0010664
Skeletal dysplasia v0.439 CEP295 Zornitza Stark gene: CEP295 was added
gene: CEP295 was added to Skeletal dysplasia. Sources: Literature
Mode of inheritance for gene: CEP295 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: CEP295 were set to 38154379
Phenotypes for gene: CEP295 were set to Seckel syndrome 11, OMIM # 620767
Review for gene: CEP295 was set to GREEN
Added comment: 4 children from 2 unrelated families with Seckel-like syndrome - severe primary microcephaly, short stature, developmental delay, intellectual disability, facial deformities, and abnormalities of fingers and toes. WES identified biallelic pathogenic variants in CEP295 gene (p(Q544∗) and p(R1520∗); p(R55Efs∗49) and p(P562L)).

Patient-derived fibroblasts and CEP295-depleted U2OS and RPE1 cells were used to clarify the underlying mechanisms. Depletion of CEP295 resulted in a decrease in the numbers of centrioles and centrosomes and triggered p53-dependent G1 cell cycle arrest. Loss of CEP295 caused extensive primary ciliary defects in both patient-derived fibroblasts and RPE1 cells. The results from complementary experiments revealed that the wild-type CEP295, but not the mutant protein, can correct the developmental defects of the centrosome/centriole and cilia in the patient-derived skin fibroblasts.
Sources: Literature
Skeletal dysplasia v0.362 COL10A1 Zornitza Stark changed review comment from: Note: Gene reviews also notes severe lethal phenotypes in recessive inheritance where parents were only mildly affected, however only 2 unrelated families reported to date (PMID: 31633898). Both haploinsufficiency and dominant-negative mechanisms have been suggested to cause disease (OMIM, PMID: 15880705, PMID: 31633898). “Pathogenic variants in COL10A1 are clustered in the C-terminal non-collagenous (NC1) domain, which contains motifs required for normal assembly of the collagen trimer. Both missense and truncating (frameshift and nonsense) variants in COL10A1 cause collagen X protein misfolding during protein synthesis, resulting in a failure of trimerization and aggregation within the endoplasmic reticulum (ER) of hypertrophic chondrocytes. Resultant ER stress, activation of the unfolded protein response, and reduced levels of functional type X collagen in the growth plate cause chondrodysplasia and development of the SMCD phenotype [Rajpar et al 2009].” -> from Gene Reviews (PMID: 31633898). Some pathogenic missense also reported in the N-terminal signal peptide (Decipher).

Note that unlike with other collagens, Gly-X-Y substitutions in the collagen triple helix repeats are very rarely reported as disease-causing, and may result in a milder phenotype (PMID 31348255; 25542771). These should be interpreted with caution.; to: Note that unlike with other collagens, Gly-X-Y substitutions in the collagen triple helix repeats are very rarely reported as disease-causing, and may result in a milder phenotype (PMID 31348255; 25542771). These should be interpreted with caution.
Skeletal dysplasia v0.362 COL10A1 Zornitza Stark changed review comment from: Note: Gene reviews also notes severe lethal phenotypes in recessive inheritance where parents were only mildly affected, however only 2 unrelated families reported to date (PMID: 31633898). Both haploinsufficiency and dominant-negative mechanisms have been suggested to cause disease (OMIM, PMID: 15880705, PMID: 31633898). “Pathogenic variants in COL10A1 are clustered in the C-terminal non-collagenous (NC1) domain, which contains motifs required for normal assembly of the collagen trimer. Both missense and truncating (frameshift and nonsense) variants in COL10A1 cause collagen X protein misfolding during protein synthesis, resulting in a failure of trimerization and aggregation within the endoplasmic reticulum (ER) of hypertrophic chondrocytes. Resultant ER stress, activation of the unfolded protein response, and reduced levels of functional type X collagen in the growth plate cause chondrodysplasia and development of the SMCD phenotype [Rajpar et al 2009].” -> from Gene Reviews (PMID: 31633898). Some pathogenic missense also reported in the N-terminal signal peptide (Decipher), however please note that to date, no Gly-X-Y substitutions in the collagen triple helix repeats have yet been reported, pathogenic or otherwise.; to: Note: Gene reviews also notes severe lethal phenotypes in recessive inheritance where parents were only mildly affected, however only 2 unrelated families reported to date (PMID: 31633898). Both haploinsufficiency and dominant-negative mechanisms have been suggested to cause disease (OMIM, PMID: 15880705, PMID: 31633898). “Pathogenic variants in COL10A1 are clustered in the C-terminal non-collagenous (NC1) domain, which contains motifs required for normal assembly of the collagen trimer. Both missense and truncating (frameshift and nonsense) variants in COL10A1 cause collagen X protein misfolding during protein synthesis, resulting in a failure of trimerization and aggregation within the endoplasmic reticulum (ER) of hypertrophic chondrocytes. Resultant ER stress, activation of the unfolded protein response, and reduced levels of functional type X collagen in the growth plate cause chondrodysplasia and development of the SMCD phenotype [Rajpar et al 2009].” -> from Gene Reviews (PMID: 31633898). Some pathogenic missense also reported in the N-terminal signal peptide (Decipher).

Note that unlike with other collagens, Gly-X-Y substitutions in the collagen triple helix repeats are very rarely reported as disease-causing, and may result in a milder phenotype (PMID 31348255; 25542771). These should be interpreted with caution.
Skeletal dysplasia v0.303 MEG3 Zornitza Stark gene: MEG3 was added
gene: MEG3 was added to Skeletal dysplasia. Sources: Expert list
SV/CNV, non-coding gene tags were added to gene: MEG3.
Mode of inheritance for gene: MEG3 was set to MONOALLELIC, autosomal or pseudoautosomal, paternally imprinted (maternal allele expressed)
Publications for gene: MEG3 were set to 33010492; 33746039; 33067531; 38212313
Phenotypes for gene: MEG3 were set to Kagami-Ogata syndrome, MIM# 608149
Review for gene: MEG3 was set to GREEN
Added comment: Small deletions of MAG3 reported in multiple patients as one of the mechanisms of disease. Bell-shaped thorax and multiple other skeletal anomalies are a feature.
Sources: Expert list