21-43169241-T-C

Position:

• chr21-43169241-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PP3_Moderate

The NM_000394.4(CRYAA):​c.142T>C​(p.Tyr48His) variant causes a missense change. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 10)
  • Exomes 𝑓: 0.0000026 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CRYAA NM_000394.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.58

Genes affected

CRYAA (HGNC:2388): (crystallin alpha A) Mammalian lens crystallins are divided into alpha, beta, and gamma families. Alpha crystallins are composed of two gene products: alpha-A and alpha-B, for acidic and basic, respectively. Alpha crystallins can be induced by heat shock and are members of the small heat shock protein (HSP20) family. They act as molecular chaperones although they do not renature proteins and release them in the fashion of a true chaperone; instead they hold them in large soluble aggregates. Post-translational modifications decrease the ability to chaperone. These heterogeneous aggregates consist of 30-40 subunits; the alpha-A and alpha-B subunits have a 3:1 ratio, respectively. Two additional functions of alpha crystallins are an autokinase activity and participation in the intracellular architecture. The encoded protein has been identified as a moonlighting protein based on its ability to perform mechanistically distinct functions. Alpha-A and alpha-B gene products are differentially expressed; alpha-A is preferentially restricted to the lens and alpha-B is expressed widely in many tissues and organs. Defects in this gene cause autosomal dominant congenital cataract (ADCC). [provided by RefSeq, Jan 2014]

CRYAA (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a chain Alpha-crystallin A(1-172) (size 171) in uniprot entity CRYAA_HUMAN there are 32 pathogenic changes around while only 0 benign (100%) in NM_000394.4
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.889

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CRYAA	NM_000394.4	c.142T>C	p.Tyr48His	missense_variant	1/3	ENST00000291554.6	NP_000385.1
LOC107987300	XR_007067885.1	n.546+1796A>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CRYAA	ENST00000291554.6	c.142T>C	p.Tyr48His	missense_variant	1/3	1	NM_000394.4	ENSP00000291554.2
CRYAA	ENST00000482775.1	n.155T>C		non_coding_transcript_exon_variant	1/4	5

Frequencies

GnomAD3 genomes Cov.: 10

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000258 AC: 2 AN: 774012 Hom.: 0 Cov.: 11 AF XY: 0.00000499 AC XY: 2 AN XY: 400966

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000525

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 10

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.65
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.95	D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Uncertain	2.8	M
PrimateAI	Uncertain	0.71	T
PROVEAN	Uncertain	-3.2	D
REVEL	Pathogenic	0.84
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.022	D
Polyphen		1.0	D
Vest4		0.77
MutPred		0.68		Gain of disorder (P = 0.0312);
MVP		0.89
MPC		1.4
ClinPred		0.99	D
GERP RS		4.9
Varity_R		0.93
gMVP		0.75

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: rs864309685; hg19: chr21-44589351;