rs727505275

chr16-21262071-G-A

Variant summary

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

The NM_001376256.1(CRYM):c.761C>T(p.Ala254Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000929 in 1,613,942 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. A254A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000072 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

CRYM
NM_001376256.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 9.06

Variant links:

Genes affected

CRYM (HGNC:2418): (crystallin mu) Crystallins are separated into two classes: taxon-specific and ubiquitous. The former class is also called phylogenetically-restricted crystallins. The latter class constitutes the major proteins of vertebrate eye lens and maintains the transparency and refractive index of the lens. This gene encodes a taxon-specific crystallin protein that binds NADPH and has sequence similarity to bacterial ornithine cyclodeaminases. The encoded protein does not perform a structural role in lens tissue, and instead it binds thyroid hormone for possible regulatory or developmental roles. Mutations in this gene have been associated with autosomal dominant non-syndromic deafness. [provided by RefSeq, Sep 2014]

CRYM links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.838

BS2

High AC in GnomAd at 11 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CRYM	NM_001376256.1 linkuse as main transcript	c.761C>T	p.Ala254Val	missense_variant	6/8	ENST00000572914.2
CRYM	NM_001888.5 linkuse as main transcript	c.761C>T	p.Ala254Val	missense_variant	8/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CRYM	ENST00000572914.2 linkuse as main transcript	c.761C>T	p.Ala254Val	missense_variant	6/8	2	NM_001376256.1	P1

Frequencies

GnomAD3 genomes

AF:

0.0000723

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000798

AC:

AN:

250756

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135564

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461806

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727196

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000723

AC:

AN:

152136

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74312

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000564

Hom.:

Bravo

AF:

0.000238

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 11, 2020	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Nov 27, 2023	This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 254 of the CRYM protein (p.Ala254Val). This variant is present in population databases (rs727505275, gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CRYM-related conditions. ClinVar contains an entry for this variant (Variation ID: 179999). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CRYM protein function with a negative predictive value of 80%. 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. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Nov 20, 2014

Variant classified as Uncertain Significance - Favor Benign. The p.Ala254Val var iant in CRYM has not been reported in any other families with hearing loss or in large population studies. Computational prediction tools and conservation analy sis suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. However, the presence of this variant in an unaffected parent decreases the likelihood that it is pathogenic. In summary, while the clinical significance of the p.Ala254Val variant is unc ertain, these data suggest that it is more likely to be benign. -

Autosomal dominant nonsyndromic hearing loss 40

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.34

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.16

Cadd

Uncertain

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.76

D;D;.

Eigen

Pathogenic

0.83

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Pathogenic

0.97

M_CAP

Uncertain

0.18

MetaRNN

Pathogenic

0.84

D;D;D

MetaSVM

Uncertain

0.14

MutationAssessor

Uncertain

2.3

M;M;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.53

PROVEAN

Uncertain

-3.7

D;D;.

REVEL

Pathogenic

0.68

Sift

Pathogenic

0.0

D;D;.

Sift4G

Uncertain

0.0030

D;D;.

Polyphen

1.0

D;D;.

Vest4

0.74

MutPred

0.69

Gain of helix (P = 0.0325);Gain of helix (P = 0.0325);.;

MVP

0.96

MPC

1.1

ClinPred

0.99

GERP RS

5.6

Varity_R

0.86

gMVP

0.89

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.

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