chr22-26623233-G-C

Position:

chr22-26623233-G-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The NM_001886.3(CRYBA4):c.40-1G>C variant causes a splice acceptor change. The variant allele was found at a frequency of 0.00532 in 1,612,052 control chromosomes in the GnomAD database, including 35 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0036 ( 3 hom., cov: 32)

Exomes 𝑓: 0.0055 ( 32 hom. )

Consequence

CRYBA4
NM_001886.3 splice_acceptor

Scores

Splicing: ADA: 1.000

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 6.83

Variant links:

Genes affected

CRYBA4 (HGNC:2396): (crystallin beta A4) 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 acidic group member, is part of a gene cluster with beta-B1, beta-B2, and beta-B3. [provided by RefSeq, Jul 2008]

CRYBA4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

Multiple lines of computational evidence support a deleterious effect 5: BayesDel_noAF, dbscSNV1_ADA, dbscSNV1_RF, max_spliceai, Eigen [when BayesDel_addAF, MutationTaster was below the threshold]

BS2

High AC in GnomAd4 at 544 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CRYBA4	NM_001886.3 linkuse as main transcript	c.40-1G>C		splice_acceptor_variant		ENST00000354760.4
CRYBA4	XM_006724140.4 linkuse as main transcript	c.55-1G>C		splice_acceptor_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CRYBA4	ENST00000354760.4 linkuse as main transcript	c.40-1G>C		splice_acceptor_variant		1	NM_001886.3	P1
CRYBA4	ENST00000466315.1 linkuse as main transcript	n.55+598G>C		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes

AF:

0.00358

AC:

544

AN:

152098

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00113

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00262

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00331

Gnomad FIN

AF:

0.000850

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00628

Gnomad OTH

AF:

0.00192

GnomAD3 exomes

AF:

0.00334

AC:

836

AN:

250598

Hom.:

AF XY:

0.00333

AC XY:

451

AN XY:

135500

show subpopulations

Gnomad AFR exome

AF:

0.000989

Gnomad AMR exome

AF:

0.00197

Gnomad ASJ exome

AF:

0.000199

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00235

Gnomad FIN exome

AF:

0.00124

Gnomad NFE exome

AF:

0.00556

Gnomad OTH exome

AF:

0.00327

GnomAD4 exome

AF:

0.00550

AC:

8026

AN:

1459836

Hom.:

Cov.:

AF XY:

0.00537

AC XY:

3897

AN XY:

726342

show subpopulations

Gnomad4 AFR exome

AF:

0.000658

Gnomad4 AMR exome

AF:

0.00197

Gnomad4 ASJ exome

AF:

0.000191

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00302

Gnomad4 FIN exome

AF:

0.00122

Gnomad4 NFE exome

AF:

0.00659

Gnomad4 OTH exome

AF:

0.00409

GnomAD4 genome

AF:

0.00357

AC:

544

AN:

152216

Hom.:

Cov.:

AF XY:

0.00313

AC XY:

233

AN XY:

74420

show subpopulations

Gnomad4 AFR

AF:

0.00113

Gnomad4 AMR

AF:

0.00262

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00332

Gnomad4 FIN

AF:

0.000850

Gnomad4 NFE

AF:

0.00628

Gnomad4 OTH

AF:

0.00190

Alfa

AF:

0.00541

Hom.:

Bravo

AF:

0.00356

TwinsUK

AF:

0.00701

AC:

ALSPAC

AF:

0.00597

AC:

ESP6500AA

AF:

0.00113

AC:

ESP6500EA

AF:

0.00547

AC:

ExAC

AF:

0.00323

AC:

392

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00622

EpiControl

AF:

0.00545

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	May 27, 2019	This variant is associated with the following publications: (PMID: 26694549) -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2021	- -

Cataract 23

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 09, 2024

- -

Developmental cataract

Benign:1

Benign, no assertion criteria provided

research

Eye Genetics Research Group, Children's Medical Research Institute

Jan 09, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.0076

BayesDel_noAF

Pathogenic

0.22

CADD

Uncertain

DANN

Uncertain

0.99

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.87

FATHMM_MKL

Pathogenic

0.99

MutationTaster

Benign

1.0

GERP RS

4.5

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.94

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.99

Position offset: 1

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over