chr11-22262163-T-A

Position:

• chr11-22262163-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 6P and 2B. PM1 PM2 PM5 BP4_Moderate

The NM_213599.3(ANO5):​c.1665T>A​(p.Ser555Arg) 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. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S555I) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ANO5 NM_213599.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.111

Genes affected

ANO5 (HGNC:27337): (anoctamin 5) This gene encodes a member of the anoctamin family of transmembrane proteins. The encoded protein is likely a calcium activated chloride channel. Mutations in this gene have been associated with gnathodiaphyseal dysplasia. Alternatively spliced transcript variants have been described. [provided by RefSeq, Nov 2009]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a topological_domain Cytoplasmic (size 24) in uniprot entity ANO5_HUMAN there are 8 pathogenic changes around while only 0 benign (100%) in NM_213599.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-22262162-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 286450.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.099539995).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ANO5	NM_213599.3	c.1665T>A	p.Ser555Arg	missense_variant	16/22	ENST00000324559.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ANO5	ENST00000324559.9	c.1665T>A	p.Ser555Arg	missense_variant	16/22	1	NM_213599.3	P2
	ENST00000526935.1	n.88+6A>T		splice_donor_region_variant, intron_variant, non_coding_transcript_variant		3

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

Gnathodiaphyseal dysplasia;C1969785:Autosomal recessive limb-girdle muscular dystrophy type 2L Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 19, 2019

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with an ANO5-related disease. This sequence change replaces serine with arginine at codon 555 of the ANO5 protein (p.Ser555Arg). The serine residue is moderately conserved and there is a moderate physicochemical difference between serine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Benign	9.1
DANN	Uncertain	0.98
DEOGEN2	Benign	0.15	T
Eigen	Benign	-0.60
Eigen_PC	Benign	-0.51
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Uncertain	0.95	D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.9	L
MutationTaster	Benign	0.55	N
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-2.5	N
REVEL	Benign	0.14
Sift	Benign	0.12	T
Sift4G	Benign	0.71	T
Polyphen		0.0050	B
Vest4		0.36
MutPred		0.51		Loss of disorder (P = 0.0825);
MVP		0.43
MPC		0.50
ClinPred		0.97	D
GERP RS		-4.5
Varity_R		0.41
gMVP		0.82

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: rs1554931739; hg19: chr11-22283709;