1-86430891-C-T

Position:

• chr1-86430891-C-T

Variant summary

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

The NM_006536.7(CLCA2):​c.505C>T​(p.Leu169Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,254 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CLCA2 NM_006536.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.779

Genes affected

CLCA2 (HGNC:2016): (chloride channel accessory 2) This gene encodes a member of the calcium-activated chloride channel regulator (CLCR) family of proteins. Members of this family regulate the transport of chloride across the plasma membrane. The encoded protein is autoproteolytically processed to generate N- and C- terminal fragments. Expression of this gene is upregulated by the tumor suppressor protein p53 in response to DNA damage. In breast cancer, expression of this gene is downregulated and the encoded protein may inhibit migration and invasion while promoting mesenchymal-to-epithelial transition in cancer cell lines. [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLCA2	NM_006536.7	c.505C>T	p.Leu169Phe	missense_variant	4/14	ENST00000370565.5
CLCA2	XM_011542448.4	c.505C>T	p.Leu169Phe	missense_variant	4/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLCA2	ENST00000370565.5	c.505C>T	p.Leu169Phe	missense_variant	4/14	1	NM_006536.7	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461254 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 726910

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

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

Nov 05, 2021

The c.505C>T (p.L169F) alteration is located in exon 4 (coding exon 4) of the CLCA2 gene. This alteration results from a C to T substitution at nucleotide position 505, causing the leucine (L) at amino acid position 169 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	0.081
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Benign	0.59	D
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.0062	T
MetaRNN	Uncertain	0.55	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-2.9	D
REVEL	Benign	0.14
Sift	Benign	0.13	T
Sift4G	Benign	0.18	T
Polyphen		0.51	P
Vest4		0.41
MutPred		0.85		Gain of sheet (P = 0.1208);
MVP		0.40
MPC		0.20
ClinPred		0.93	D
GERP RS		5.1
Varity_R		0.41
gMVP		0.54

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: rs1468138529; hg19: chr1-86896574;