5-128369178-C-T
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Variant summary
Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong
The NM_001999.4(FBN2):c.2248+4G>A variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,794 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000014 ( 0 hom. )
Consequence
FBN2
NM_001999.4 splice_donor_region, intron
NM_001999.4 splice_donor_region, intron
Scores
2
Splicing: ADA: 0.0003465
2
Clinical Significance
Conservation
PhyloP100: -2.45
Genes affected
FBN2 (HGNC:3604): (fibrillin 2) The protein encoded by this gene is a component of connective tissue microfibrils and may be involved in elastic fiber assembly. Mutations in this gene cause congenital contractural arachnodactyly. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Likely_benign. Variant got -2 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.76).
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
FBN2 | NM_001999.4 | c.2248+4G>A | splice_donor_region_variant, intron_variant | ENST00000262464.9 | |||
FBN2 | XM_017009228.3 | c.2095+4G>A | splice_donor_region_variant, intron_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
FBN2 | ENST00000262464.9 | c.2248+4G>A | splice_donor_region_variant, intron_variant | 1 | NM_001999.4 | P1 | |||
FBN2 | ENST00000508989.5 | c.2149+4G>A | splice_donor_region_variant, intron_variant | 2 | |||||
FBN2 | ENST00000511489.1 | n.469+4G>A | splice_donor_region_variant, intron_variant, non_coding_transcript_variant | 3 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461794Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1AN XY: 727204
GnomAD4 exome
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2
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1461794
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31
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1
AN XY:
727204
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GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Congenital contractural arachnodactyly Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Dec 06, 2022 | 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. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. ClinVar contains an entry for this variant (Variation ID: 528407). This variant has not been reported in the literature in individuals affected with FBN2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change falls in intron 16 of the FBN2 gene. It does not directly change the encoded amino acid sequence of the FBN2 protein. It affects a nucleotide within the consensus splice site. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Benign
dbscSNV1_RF
Benign
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at