18-24156344-G-T

Position:

• chr18-24156344-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000621648.4(CABYR):​c.843G>T​(p.Leu281Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CABYR ENST00000621648.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.457

Genes affected

CABYR (HGNC:15569): (calcium binding tyrosine phosphorylation regulated) To reach fertilization competence, spermatozoa undergo a series of morphological and molecular maturational processes, termed capacitation, involving protein tyrosine phosphorylation and increased intracellular calcium. The protein encoded by this gene localizes to the principal piece of the sperm flagellum in association with the fibrous sheath and exhibits calcium-binding when phosphorylated during capacitation. A pseudogene on chromosome 3 has been identified for this gene. Alternatively spliced transcript variants encoding distinct protein isoforms have been found for this gene. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.105769604).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CABYR	NM_153769.3	c.541+302G>T		intron_variant		ENST00000399496.8	NP_722453.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CABYR	ENST00000399496.8	c.541+302G>T		intron_variant		1	NM_153769.3	ENSP00000382419	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 27, 2021

The c.843G>T (p.L281F) alteration is located in exon 4 (coding exon 3) of the CABYR gene. This alteration results from a G to T substitution at nucleotide position 843, causing the leucine (L) at amino acid position 281 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.067
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	15
DANN	Benign	0.89
DEOGEN2	Benign	0.036	T;.;T;T;T
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.59
FATHMM_MKL	Benign	0.43	N
LIST_S2	Benign	0.66	T;T;.;.;T
M_CAP	Benign	0.0052	T
MetaRNN	Benign	0.11	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.3	.;.;L;L;L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-1.1	.;.;N;.;.
REVEL	Benign	0.041
Sift	Pathogenic	0.0	.;.;D;.;.
Sift4G	Benign	0.077	T;T;T;T;T
Polyphen		0.0040, 0.0020	.;B;B;B;B
Vest4		0.050
MutPred		0.19		.;.;Loss of disorder (P = 0.1687);Loss of disorder (P = 0.1687);Loss of disorder (P = 0.1687);
MVP		0.15
ClinPred		0.34	T
GERP RS		-2.0
Varity_R		0.21
gMVP		0.060

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: rs2085785388; hg19: chr18-21736308;