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Fetal anomalies v6.157 LMNB2 Achchuthan Shanmugasundram Tag Q2_25_ MOI was removed from gene: LMNB2.
Tag Q2_25_ NHS_review was removed from gene: LMNB2.
Fetal anomalies v6.157 LMNB2 Achchuthan Shanmugasundram changed review comment from: After NHS Genomic Medicine Service consideration, the mode of inheritance of this gene has not been changed and remains MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted. The GMS reviewers noted as follows: Pathogenic monoallelic missense variants are causative of primary microcephaly. Homozygous loss-of-function variant reported in two related newborns with severe brain development abnormalities and perinatal death, phenotype consistent with Lmnb2-deficient mouse models (PMID:40011009). At least one further unrelated case is required to confirm an additional biallelic loss-of-function mechanism for LMNB2-related disease (mechanism of pathogenicity for monoallelic variants is uncertain).; to: After NHS Genomic Medicine Service consideration, the mode of inheritance of this gene has not been changed and remains MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted.

The GMS reviewers noted as follows:
Pathogenic monoallelic missense variants are causative of primary microcephaly. Homozygous loss-of-function variant reported in two related newborns with severe brain development abnormalities and perinatal death, phenotype consistent with Lmnb2-deficient mouse models (PMID:40011009). At least one further unrelated case is required to confirm an additional biallelic loss-of-function mechanism for LMNB2-related disease (mechanism of pathogenicity for monoallelic variants is uncertain).
Fetal anomalies v6.157 LMNB2 Achchuthan Shanmugasundram commented on gene: LMNB2
Fetal anomalies v5.90 LMNB2 Sarah Leigh Tag Q2_25_ MOI tag was added to gene: LMNB2.
Tag Q2_25_ NHS_review tag was added to gene: LMNB2.
Fetal anomalies v5.90 LMNB2 Sarah Leigh changed review comment from: PMID: 40011009 reports two related babies who were homozygous for a loss-of-function LMNB2 variant. Both babies shared a similar phenotype of severe brain development abnormalities and died during the perinatal period. This shared phenotype was reflected in the several Lmnb2-deficient mouse models.
Material from the patient’s fibroblasts (obtained at birth) were used in Western blot and immunofluorescence cell labelling, and confirmed the complete absence of lamin B2 and revealed an increase in lamin B1, together with alterations in alpha-tubulin and vimentin organisation. (PMID: 40011009).; to: PMID: 40011009 reports two related babies who were homozygous for a loss-of-function LMNB2 variant. Both babies shared a similar phenotype of severe brain development abnormalities and died during the perinatal period. This shared phenotype was reflected in several Lmnb2-deficient mouse models.
Material from the patient’s fibroblasts (obtained at birth) were used in Western blot and immunofluorescence cell labelling, and confirmed the complete absence of lamin B2 and revealed an increase in lamin B1, together with alterations in alpha-tubulin and vimentin organisation. (PMID: 40011009).
Fetal anomalies v5.90 LMNB2 Sarah Leigh reviewed gene: LMNB2: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: ; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Fetal anomalies v5.90 LMNB2 Sarah Leigh Phenotypes for gene: LMNB2 were changed from Microcephaly 27, primary, autosomal dominant, OMIM:619180 to Microcephaly 27, primary, autosomal dominant, OMIM:619180; microcephaly 27, primary, autosomal dominant, MONDO:0030929
Fetal anomalies v5.89 LMNB2 Sarah Leigh Publications for gene: LMNB2 were set to 33033404
Fetal anomalies v5.87 LMNB2 Sarah Graham reviewed gene: LMNB2: Rating: GREEN; Mode of pathogenicity: None; Publications: PMID: 40011009; Phenotypes: ; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
Fetal anomalies v1.836 LMNB2 Arina Puzriakova Tag Q4_21_rating was removed from gene: LMNB2.
Fetal anomalies v1.836 LMNB2 Arina Puzriakova commented on gene: LMNB2: The rating of this gene has been updated following NHS Genomic Medicine Service approval.
Fetal anomalies v1.835 LMNB2 Arina Puzriakova Source Expert Review Green was added to LMNB2.
Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Fetal anomalies v1.777 LMNB2 Arina Puzriakova Phenotypes for gene: LMNB2 were changed from Microcephaly 27, primary, autosomal dominant to Microcephaly 27, primary, autosomal dominant, OMIM:619180
Fetal anomalies v1.776 LMNB2 Arina Puzriakova Publications for gene: LMNB2 were set to PMID: 33033404
Fetal anomalies v1.775 LMNB2 Arina Puzriakova Classified gene: LMNB2 as Amber List (moderate evidence)
Fetal anomalies v1.775 LMNB2 Arina Puzriakova Added comment: Comment on list classification: Following curation and clinical review it has been agreed that the associated phenotype is fetally-relevant and therefore this gene should be promoted to Green at the next GMS panel update (added 'Q4_21_rating' tag)
Fetal anomalies v1.775 LMNB2 Arina Puzriakova Gene: lmnb2 has been classified as Amber List (Moderate Evidence).
Fetal anomalies v1.774 LMNB2 Arina Puzriakova Tag Q4_21_rating tag was added to gene: LMNB2.
Fetal anomalies v1.749 LMNB2 Rhiannon Mellis gene: LMNB2 was added
gene: LMNB2 was added to Fetal anomalies. Sources: Expert Review,Literature
Mode of inheritance for gene: LMNB2 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: LMNB2 were set to PMID: 33033404
Phenotypes for gene: LMNB2 were set to Microcephaly 27, primary, autosomal dominant
Added comment: This gene and phenotype were reviewed during a meeting on 21st October 2021 between representatives of the North Thames and Central & South R21 testing GLHs.

Clinical review and curation was performed by Lyn Chitty, Alison Male, Rowenna Roberts, Rhiannon Mellis (North Thames GLH) and Stephanie Allen, Denise Williams and Esther Kinning (Central & South GLH).

Outcome of review: Confirmed that the phenotype is fetally relevant, support adding to the Fetal anomalies panel as a Green gene.

Already rated Green on the following other PanelApp panel(s): Severe microcephaly (pending)

Details of review:
Parry et al 2020 (PMID: 33033404) report on a cohort from DDD and 100k genomes studies: 13 individuals with heterozygous variant in LMNB1 (N=7) and LMNB2 (N=6) - phenotype of severe congenital microcephaly and ID (otherwise non-syndromic).
Sources: Expert Review, Literature
Fetal anomalies v1.749 LMNB1 Rhiannon Mellis gene: LMNB1 was added
gene: LMNB1 was added to Fetal anomalies. Sources: Literature,Expert Review
Mode of inheritance for gene: LMNB1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: LMNB1 were set to PMID: 33033404
Phenotypes for gene: LMNB1 were set to Microcephaly 26, primary, autosomal dominant
Review for gene: LMNB1 was set to GREEN
Added comment: This gene and phenotype were reviewed during a meeting on 21st October 2021 between representatives of the North Thames and Central & South R21 testing GLHs.

Clinical review and curation was performed by Lyn Chitty, Alison Male, Rowenna Roberts, Rhiannon Mellis (North Thames GLH) and Stephanie Allen, Denise Williams and Esther Kinning (Central & South GLH).

Outcome of review: Confirmed that the phenotype is fetally relevant, support adding to the Fetal anomalies panel as a Green gene.

Already rated Green on the following other PanelApp panel(s): Severe microcephaly (pending)

Details of review:
Parry et al 2020 (PMID: 33033404) report on a cohort from DDD and 100k genomes studies: 13 individuals with heterozygous variant in LMNB1 (N=7) and LMNB2 (N=6) - phenotype of severe congenital microcephaly and ID (otherwise non-syndromic).
Sources: Literature, Expert Review