chr22-25221469-T-A

Variant summary

Our verdict is Benign. Variant got -18 ACMG points: 2P and 20B. PM1BP4_StrongBP6_Very_StrongBA1

The NM_000496.3(CRYBB2):​c.40T>A​(p.Ser14Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0022 in 1,613,458 control chromosomes in the GnomAD database, including 128 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0030 ( 20 hom., cov: 32)
Exomes 𝑓: 0.0021 ( 108 hom. )

Consequence

CRYBB2
NM_000496.3 missense

Scores

18

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 1.75
Variant links:
Genes affected
CRYBB2 (HGNC:2398): (crystallin beta B2) Crystallins are separated into two classes: taxon-specific, or enzyme, and ubiquitous. The latter class constitutes the major proteins of vertebrate eye lens and maintains the transparency and refractive index of the lens. Since lens central fiber cells lose their nuclei during development, these crystallins are made and then retained throughout life, making them extremely stable proteins. Mammalian lens crystallins are divided into alpha, beta, and gamma families; beta and gamma crystallins are also considered as a superfamily. Alpha and beta families are further divided into acidic and basic groups. Seven protein regions exist in crystallins: four homologous motifs, a connecting peptide, and N- and C-terminal extensions. Beta-crystallins, the most heterogeneous, differ by the presence of the C-terminal extension (present in the basic group, none in the acidic group). Beta-crystallins form aggregates of different sizes and are able to self-associate to form dimers or to form heterodimers with other beta-crystallins. This gene, a beta basic group member, is part of a gene cluster with beta-A4, beta-B1, and beta-B3. A chain-terminating mutation was found to cause type 2 cerulean cataracts. [provided by RefSeq, Jul 2008]

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -18 ACMG points.

PM1
In a chain Beta-crystallin B2 (size 203) in uniprot entity CRBB2_HUMAN there are 23 pathogenic changes around while only 1 benign (96%) in NM_000496.3
BP4
Computational evidence support a benign effect (MetaRNN=0.0017588735).
BP6
Variant 22-25221469-T-A is Benign according to our data. Variant chr22-25221469-T-A is described in ClinVar as [Benign]. Clinvar id is 667923.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
BA1
GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.0669 is higher than 0.05.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
CRYBB2NM_000496.3 linkuse as main transcriptc.40T>A p.Ser14Thr missense_variant 2/6 ENST00000398215.3 NP_000487.1
CRYBB2XM_006724141.4 linkuse as main transcriptc.40T>A p.Ser14Thr missense_variant 2/6 XP_006724204.1

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
CRYBB2ENST00000398215.3 linkuse as main transcriptc.40T>A p.Ser14Thr missense_variant 2/61 NM_000496.3 ENSP00000381273 P1
CRYBB2ENST00000651629.1 linkuse as main transcriptc.40T>A p.Ser14Thr missense_variant 2/6 ENSP00000498905 P1

Frequencies

GnomAD3 genomes
AF:
0.00296
AC:
450
AN:
152138
Hom.:
20
Cov.:
32
show subpopulations
Gnomad AFR
AF:
0.000459
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.00137
Gnomad ASJ
AF:
0.00
Gnomad EAS
AF:
0.0732
Gnomad SAS
AF:
0.00229
Gnomad FIN
AF:
0.00
Gnomad MID
AF:
0.00
Gnomad NFE
AF:
0.000132
Gnomad OTH
AF:
0.00478
GnomAD3 exomes
AF:
0.00581
AC:
1459
AN:
251280
Hom.:
58
AF XY:
0.00564
AC XY:
766
AN XY:
135842
show subpopulations
Gnomad AFR exome
AF:
0.000677
Gnomad AMR exome
AF:
0.000202
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.0762
Gnomad SAS exome
AF:
0.000653
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.0000792
Gnomad OTH exome
AF:
0.00179
GnomAD4 exome
AF:
0.00212
AC:
3101
AN:
1461202
Hom.:
108
Cov.:
30
AF XY:
0.00214
AC XY:
1558
AN XY:
726958
show subpopulations
Gnomad4 AFR exome
AF:
0.000329
Gnomad4 AMR exome
AF:
0.000179
Gnomad4 ASJ exome
AF:
0.0000383
Gnomad4 EAS exome
AF:
0.0692
Gnomad4 SAS exome
AF:
0.000916
Gnomad4 FIN exome
AF:
0.0000187
Gnomad4 NFE exome
AF:
0.0000621
Gnomad4 OTH exome
AF:
0.00300
GnomAD4 genome
AF:
0.00296
AC:
451
AN:
152256
Hom.:
20
Cov.:
32
AF XY:
0.00322
AC XY:
240
AN XY:
74436
show subpopulations
Gnomad4 AFR
AF:
0.000457
Gnomad4 AMR
AF:
0.00137
Gnomad4 ASJ
AF:
0.00
Gnomad4 EAS
AF:
0.0730
Gnomad4 SAS
AF:
0.00229
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.000132
Gnomad4 OTH
AF:
0.00614
Alfa
AF:
0.00255
Hom.:
6
Bravo
AF:
0.00280
ESP6500AA
AF:
0.000454
AC:
2
ESP6500EA
AF:
0.00
AC:
0
ExAC
AF:
0.00532
AC:
646
Asia WGS
AF:
0.0200
AC:
69
AN:
3478
EpiCase
AF:
0.0000545
EpiControl
AF:
0.000237

ClinVar

Significance: Benign
Submissions summary: Benign:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

Cataract 3 multiple types Benign:1
Benign, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpNov 27, 2023- -
not provided Benign:1
Benign, criteria provided, single submitterclinical testingGeneDxMay 16, 2018This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
0.063
BayesDel_addAF
Benign
-0.56
T
BayesDel_noAF
Benign
-0.52
CADD
Benign
14
DANN
Benign
0.88
DEOGEN2
Benign
0.070
T
Eigen
Benign
-0.75
Eigen_PC
Benign
-0.56
FATHMM_MKL
Benign
0.53
D
LIST_S2
Benign
0.31
T
MetaRNN
Benign
0.0018
T
MetaSVM
Benign
-1.1
T
MutationAssessor
Benign
0.42
N
MutationTaster
Benign
1.0
N
PrimateAI
Benign
0.44
T
PROVEAN
Benign
-0.59
N
REVEL
Benign
0.068
Sift
Benign
0.46
T
Sift4G
Benign
0.74
T
Polyphen
0.0010
B
Vest4
0.092
MVP
0.43
MPC
0.42
ClinPred
0.0039
T
GERP RS
1.6
Varity_R
0.050

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.0
Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs117457580; hg19: chr22-25617436; API