rs587784405
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM2PP2PP3PP5BP4
The NM_006306.4(SMC1A):c.1457A>G(p.Asp486Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: not found (cov: 22)
Consequence
SMC1A
NM_006306.4 missense
NM_006306.4 missense
Scores
6
9
2
Clinical Significance
Conservation
PhyloP100: 7.99
Genes affected
SMC1A (HGNC:11111): (structural maintenance of chromosomes 1A) Proper cohesion of sister chromatids is a prerequisite for the correct segregation of chromosomes during cell division. The cohesin multiprotein complex is required for sister chromatid cohesion. This complex is composed partly of two structural maintenance of chromosomes (SMC) proteins, SMC3 and either SMC1B or the protein encoded by this gene. Most of the cohesin complexes dissociate from the chromosomes before mitosis, although those complexes at the kinetochore remain. Therefore, the encoded protein is thought to be an important part of functional kinetochores. In addition, this protein interacts with BRCA1 and is phosphorylated by ATM, indicating a potential role for this protein in DNA repair. This gene, which belongs to the SMC gene family, is located in an area of the X-chromosome that escapes X inactivation. Mutations in this gene result in Cornelia de Lange syndrome. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2013]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 4 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP2
?
Missense variant where missense usually causes diseases, SMC1A
PP3
?
Multiple lines of computational evidence support a deleterious effect 6: AlphaMissense, BayesDel_addAF, BayesDel_noAF, Cadd, M_CAP, phyloP100way_vertebrate [when max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]
PP5
?
Variant X-53409150-T-C is Pathogenic according to our data. Variant chrX-53409150-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 159941.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.
BP4
?
Computational evidence support a benign effect (MetaRNN=0.41340667).. Strength limited to SUPPORTING due to the PP5.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SMC1A | NM_006306.4 | c.1457A>G | p.Asp486Gly | missense_variant | 9/25 | ENST00000322213.9 | |
SMC1A | NM_001281463.1 | c.1391A>G | p.Asp464Gly | missense_variant | 10/26 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SMC1A | ENST00000322213.9 | c.1457A>G | p.Asp486Gly | missense_variant | 9/25 | 1 | NM_006306.4 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 22
GnomAD3 genomes
?
Cov.:
22
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome ? Cov.: 22
GnomAD4 genome
?
Cov.:
22
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:1Uncertain:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Congenital muscular hypertrophy-cerebral syndrome Pathogenic:1Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Oct 02, 2019 | In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with SMC1A-related conditions. ClinVar contains an entry for this variant (Variation ID: 159941). This variant is not present in population databases (ExAC no frequency). This sequence change replaces aspartic acid with glycine at codon 486 of the SMC1A protein (p.Asp486Gly). The aspartic acid residue is highly conserved and there is a moderate physicochemical difference between aspartic acid and glycine. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Genetic Services Laboratory, University of Chicago | Feb 08, 2013 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
DEOGEN2
Uncertain
T;T
FATHMM_MKL
Pathogenic
D
LIST_S2
Pathogenic
D;D
M_CAP
Pathogenic
D
MetaRNN
Benign
T;T
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
M;.
MutationTaster
Benign
D;D
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;.
REVEL
Uncertain
Sift
Uncertain
D;.
Sift4G
Uncertain
T;T
Polyphen
D;.
Vest4
MutPred
Gain of MoRF binding (P = 0.0365);.;
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at