| Date | Panel | Item | Activity | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Congenital Heart Defect v0.367 | SMG9 | Zornitza Stark Marked gene: SMG9 as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.367 | SMG9 | Zornitza Stark Gene: smg9 has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.367 | SMG9 | Zornitza Stark Phenotypes for gene: SMG9 were changed from to Heart and brain malformation syndrome, MIM# 616920 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.366 | SMG9 | Zornitza Stark Publications for gene: SMG9 were set to 27018474 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.365 | SMG9 | Zornitza Stark Mode of inheritance for gene: SMG9 was changed from Other to BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.364 | SMG9 | Zornitza Stark Classified gene: SMG9 as Green List (high evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.364 | SMG9 | Zornitza Stark Gene: smg9 has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.363 | SMG9 | Zornitza Stark reviewed gene: SMG9: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Heart and brain malformation syndrome, MIM# 616920; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.315 | SMG9 | Laura S Deleted their comment | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Congenital Heart Defect v0.315 | SMG9 |
Laura S edited their review of gene: SMG9: Added comment: Autosomal recessive inheritance Shaheen et al. in 2016 (27018474) published case reports about two consanguineous families in which a similar patter of congenital anomalies was found to be most likely caused by homozygous loss-of-function mutation in SMG9. This gene encodes an essential component of the SURF complex that generates phosphor-UPF1, the single most important step in nonsense-mediated decay (NMD). The authors generated a knock-out Smg9 mouse model using CRISPR/Cas9 and observed similar congenital anomaly syndrome to the one reported in humans. Additionally, human cells not expressing SMG9 had global transcriptional dysregulation, but not reduction of premature stop codon (PST)-containing transcripts. The affected family members in these two families showed to have phenotypic overlap between Dandy-Walker malformation and congenital heart disease. Due to the consanguineous nature in both families and the geographical proximity (both cases in Arabia) indicate the possibility of a homozygous pathogenic variants in the same gene. These variants are c.520_521delCC and c.701+4A>G, both affecting the gene SMG9. The indel in family 1 predicts a frameshift and premature truncation, p.Pro174Argfs*12. In family 2, a complete skipping of exon 6 was revealed by RT-PCR. The resulting aberrant transcript predicts frameshift and premature truncation (p.Tyr197Aspfs*10). In 2019, another case was reported by Lecoquierre et al. (31390136). The patient presented with a syndromic association of severe global developmental delay and diverse malformations. She carried a novel SMG9 homozygous variant NM_019108.3:c.1177C>T, p.(Gln393*), while her unaffected parents were both heterozygous and first-degree cousins. This absent variant in gnomaAD was predicted to result in a premature stop codon leading to nonsense-mediated decay within this single transcript gene. In 2020, Lemire et al. (32412169) reported a case of 7-year-old female with severe intellectual disability, multiple congenital anomalies, including cardiovascular anomalies, and facial dysmorphisms. No known consanguinity, the parents were heterozygous for the variant and she had an unaffected brother. She carried a homozygous missense variant in the SMG9 gene (c.1508G > C; p.Trp503Ser) identified as the likely etiology. In silico analysis predicted this change to impact protein structure/function. This missense change is rare, with only one allele count in gnomAD and no homozygotes. In 2021, Altuwaijri et al. (33609422) reported a new case in a research letter to the editor, in which a 25-month-old male had significant heart and brain malformations. Exome sequencing performed on the subject revealed the same homozygous splicing variant (NM_019108.4: exon7:c.701+4A>G) as their original report (Shaheen et al., 2016). Thus validating their previous findings.; Changed publications: 27018474 31390136 32412169 33609422; Changed phenotypes: Heart and brain malformation syndrome (HBMS) |
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| Congenital Heart Defect v0.315 | SMG9 |
Laura S changed review comment from: Autosomal recessive inheritance Shaheen et al. in 2016 (27018474) published case reports about two consanguineous families in which a similar patter of congenital anomalies was found to be most likely caused by homozygous loss-of-function mutation in SMG9. This gene encodes an essential component of the SURF complex that generates phosphor-UPF1, the single most important step in nonsense-mediated decay (NMD). The authors generated a knock-out Smg9 mouse model using CRISPR/Cas9 and observed similar congenital anomaly syndrome to the one reported in humans. Additionally, human cells not expressing SMG9 had global transcriptional dysregulation, but not reduction of premature stop codon (PST)-containing transcripts. The affected family members in these two families showed to have phenotypic overlap between Dandy-Walker malformation and congenital heart disease. Due to the consanguineous nature in both families and the geographical proximity (both cases in Arabia) indicate the possibility of a homozygous pathogenic variants in the same gene. These variants are c.520_521delCC and c.701+4A>G, both affecting the gene SMG9. The indel in family 1 predicts a frameshift and premature truncation, p.Pro174Argfs*12. In family 2, a complete skipping of exon 6 was revealed by RT-PCR. The resulting aberrant transcript predicts frameshift and premature truncation (p.Tyr197Aspfs*10). In 2019, another case was reported by Lecoquierre et al. (31390136). The patient presented with a syndromic association of severe global developmental delay and diverse malformations. She carried a novel SMG9 homozygous variant NM_019108.3:c.1177C>T, p.(Gln393*), while her unaffected parents were both heterozygous and first-degree cousins. This absent variant in gnomaAD was predicted to result in a premature stop codon leading to nonsense-mediated decay within this single transcript gene. In 2020, Lemire et al. (32412169) reported a case of 7-year-old female with severe intellectual disability, multiple congenital anomalies, including cardiovascular anomalies, and facial dysmorphisms. No known consanguinity, the parents were heterozygous for the variant and she had an unaffected brother. She carried a homozygous missense variant in the SMG9 gene (c.1508G > C; p.Trp503Ser) identified as the likely etiology. In silico analysis predicted this change to impact protein structure/function. This missense change is rare, with only one allele count in gnomAD and no homozygotes. In 2021, Altuwaijri et al. (33609422) reported a new case in a research letter to the editor, in which a 25-month-old male had significant heart and brain malformations. Exome sequencing performed on the subject revealed the same homozygous splicing variant (NM_019108.4: exon7:c.701+4A>G) as their original report (Shaheen et al., 2016). Thus validating their previous findings. Sources: Literature; to: Autosomal recessive inheritance Shaheen et al. in 2016 (27018474) published case reports about two consanguineous families in which a similar patter of congenital anomalies was found to be most likely caused by homozygous loss-of-function mutation in SMG9. This gene encodes an essential component of the SURF complex that generates phosphor-UPF1, the single most important step in nonsense-mediated decay (NMD). The authors generated a knock-out Smg9 mouse model using CRISPR/Cas9 and observed similar congenital anomaly syndrome to the one reported in humans. Additionally, human cells not expressing SMG9 had global transcriptional dysregulation, but not reduction of premature stop codon (PST)-containing transcripts. The affected family members in these two families showed to have phenotypic overlap between Dandy-Walker malformation and congenital heart disease. Due to the consanguineous nature in both families and the geographical proximity (both cases in Arabia) indicate the possibility of a homozygous pathogenic variants in the same gene. These variants are c.520_521delCC and c.701+4A>G, both affecting the gene SMG9. The indel in family 1 predicts a frameshift and premature truncation, p.Pro174Argfs*12. In family 2, a complete skipping of exon 6 was revealed by RT-PCR. The resulting aberrant transcript predicts frameshift and premature truncation (p.Tyr197Aspfs*10). In 2019, another case was reported by Lecoquierre et al. (31390136). The patient presented with a syndromic association of severe global developmental delay and diverse malformations. She carried a novel SMG9 homozygous variant NM_019108.3:c.1177C>T, p.(Gln393*), while her unaffected parents were both heterozygous and first-degree cousins. This absent variant in gnomaAD was predicted to result in a premature stop codon leading to nonsense-mediated decay within this single transcript gene. In 2020, Lemire et al. (32412169) reported a case of 7-year-old female with severe intellectual disability, multiple congenital anomalies, including cardiovascular anomalies, and facial dysmorphisms. No known consanguinity, the parents were heterozygous for the variant and she had an unaffected brother. She carried a homozygous missense variant in the SMG9 gene (c.1508G > C; p.Trp503Ser) identified as the likely etiology. In silico analysis predicted this change to impact protein structure/function. This missense change is rare, with only one allele count in gnomAD and no homozygotes. In 2021, Altuwaijri et al. (33609422) reported a new case in a research letter to the editor, in which a 25-month-old male had significant heart and brain malformations. Exome sequencing performed on the subject revealed the same homozygous splicing variant (NM_019108.4: exon7:c.701+4A>G) as their original report (Shaheen et al., 2016). Thus validating their previous findings. Sources: Literature |
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| Congenital Heart Defect v0.315 | SMG9 |
Laura S gene: SMG9 was added gene: SMG9 was added to Congenital Heart Defect. Sources: Literature Mode of inheritance for gene: SMG9 was set to Other Publications for gene: SMG9 were set to 27018474 Review for gene: SMG9 was set to RED Added comment: Autosomal recessive inheritance Shaheen et al. in 2016 (27018474) published case reports about two consanguineous families in which a similar patter of congenital anomalies was found to be most likely caused by homozygous loss-of-function mutation in SMG9. This gene encodes an essential component of the SURF complex that generates phosphor-UPF1, the single most important step in nonsense-mediated decay (NMD). The authors generated a knock-out Smg9 mouse model using CRISPR/Cas9 and observed similar congenital anomaly syndrome to the one reported in humans. Additionally, human cells not expressing SMG9 had global transcriptional dysregulation, but not reduction of premature stop codon (PST)-containing transcripts. The affected family members in these two families showed to have phenotypic overlap between Dandy-Walker malformation and congenital heart disease. Due to the consanguineous nature in both families and the geographical proximity (both cases in Arabia) indicate the possibility of a homozygous pathogenic variants in the same gene. These variants are c.520_521delCC and c.701+4A>G, both affecting the gene SMG9. The indel in family 1 predicts a frameshift and premature truncation, p.Pro174Argfs*12. In family 2, a complete skipping of exon 6 was revealed by RT-PCR. The resulting aberrant transcript predicts frameshift and premature truncation (p.Tyr197Aspfs*10). In 2019, another case was reported by Lecoquierre et al. (31390136). The patient presented with a syndromic association of severe global developmental delay and diverse malformations. She carried a novel SMG9 homozygous variant NM_019108.3:c.1177C>T, p.(Gln393*), while her unaffected parents were both heterozygous and first-degree cousins. This absent variant in gnomaAD was predicted to result in a premature stop codon leading to nonsense-mediated decay within this single transcript gene. In 2020, Lemire et al. (32412169) reported a case of 7-year-old female with severe intellectual disability, multiple congenital anomalies, including cardiovascular anomalies, and facial dysmorphisms. No known consanguinity, the parents were heterozygous for the variant and she had an unaffected brother. She carried a homozygous missense variant in the SMG9 gene (c.1508G > C; p.Trp503Ser) identified as the likely etiology. In silico analysis predicted this change to impact protein structure/function. This missense change is rare, with only one allele count in gnomAD and no homozygotes. In 2021, Altuwaijri et al. (33609422) reported a new case in a research letter to the editor, in which a 25-month-old male had significant heart and brain malformations. Exome sequencing performed on the subject revealed the same homozygous splicing variant (NM_019108.4: exon7:c.701+4A>G) as their original report (Shaheen et al., 2016). Thus validating their previous findings. Sources: Literature |
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