chr17-29249944-T-C

Position:

• chr17-29249944-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_005208.5(CRYBA1):​c.97-238T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0554 in 152,286 control chromosomes in the GnomAD database, including 277 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency: Genomes: 𝑓 0.055 (277 hom., cov: 32)
• Consequence: CRYBA1 NM_005208.5 intron
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.652

Genes affected

CRYBA1 (HGNC:2394): (crystallin beta A1) 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, encodes two proteins (crystallin, beta A3 and crystallin, beta A1) from a single mRNA, the latter protein is 17 aa shorter than crystallin, beta A3 and is generated by use of an alternate translation initiation site. Deletion of exons 3 and 4 causes the autosomal dominant disease 'zonular cataract with sutural opacities'. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 17-29249944-T-C is Benign according to our data. Variant chr17-29249944-T-C is described in ClinVar as [Benign]. Clinvar id is 1261481.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.0791 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CRYBA1	NM_005208.5	c.97-238T>C		intron_variant		ENST00000225387.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CRYBA1	ENST00000225387.8	c.97-238T>C		intron_variant		1	NM_005208.5	P1
CRYBA1	ENST00000484605.1	c.87-238T>C		intron_variant, NMD_transcript_variant		5

Frequencies

GnomAD3 genomes AF: 0.0555 AC: 8442 AN: 152168 Hom.: 278 Cov.: 32

Gnomad AFR AF: 0.0131

Gnomad AMI AF: 0.0824

Gnomad AMR AF: 0.0482

Gnomad ASJ AF: 0.0804

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.0153

Gnomad FIN AF: 0.103

Gnomad MID AF: 0.0696

Gnomad NFE AF: 0.0809

Gnomad OTH AF: 0.0555

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0554 AC: 8440 AN: 152286 Hom.: 277 Cov.: 32 AF XY: 0.0554 AC XY: 4128 AN XY: 74456

Gnomad4 AFR AF: 0.0131

Gnomad4 AMR AF: 0.0482

Gnomad4 ASJ AF: 0.0804

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.0153

Gnomad4 FIN AF: 0.103

Gnomad4 NFE AF: 0.0809

Gnomad4 OTH AF: 0.0549

Alfa AF: 0.0713 Hom.: 53

Bravo AF: 0.0490

Asia WGS AF: 0.00953 AC: 34 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 28, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	8.7
DANN	Benign	0.74

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

Other links and lift over

dbSNP: rs17727765; hg19: chr17-27576962;