1-111318553-T-G

Variant summary

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

The NM_201653.4(CHIA):c.790T>G(p.Phe264Val) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHIA NM_201653.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.30

Genes affected

CHIA (HGNC:17432): (chitinase acidic) The protein encoded by this gene degrades chitin, which is found in the cell wall of most fungi as well as in arthropods and some nematodes. The encoded protein can also stimulate interleukin 13 expression, and variations in this gene can lead to asthma susceptibility. Several transcript variants encoding a few different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

(HGNC:):

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
CHIA	NM_201653.4	c.790T>G	p.Phe264Val	missense_variant	9/12	ENST00000369740.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHIA	ENST00000369740.6	c.790T>G	p.Phe264Val	missense_variant	9/12	1	NM_201653.4	P1
	ENST00000426321.1	n.149-626A>C		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

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 07, 2021

The c.790T>G (p.F264V) alteration is located in exon 9 (coding exon 8) of the CHIA gene. This alteration results from a T to G substitution at nucleotide position 790, causing the phenylalanine (F) at amino acid position 264 to be replaced by a valine (V). 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	Uncertain	0.42
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.060
Cadd	Benign	21
Dann	Uncertain	0.99
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.78	T;.;.;T;T;.;T;T
M_CAP	Benign	0.021	T
MetaRNN	Uncertain	0.72	D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.94	T
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Benign	0.46	T
PROVEAN	Pathogenic	-5.0	D;D;D;D;D;D;D;D
REVEL	Benign	0.29
Sift	Uncertain	0.014	D;D;D;D;D;D;D;D
Sift4G	Benign	0.10	T;T;T;T;T;T;D;T
Polyphen		1.0	.;.;D;.;D;.;.;.
Vest4		0.60, 0.61, 0.61, 0.60
MutPred		0.61		.;.;Gain of sheet (P = 0.1208);.;Gain of sheet (P = 0.1208);.;.;.;
MVP		0.38
MPC		0.23
ClinPred		1.0	D
GERP RS		4.8
Varity_R		0.90
gMVP		0.65

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-111861175;