NM_201653.4:c.169G>T

Variant names:

• chr1-111312303-G-T
• rs182022651
• NM_201653.4:c.169G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_201653.4(CHIA):​c.169G>T​(p.Ala57Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000197 in 151,904 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A57T) has been classified as Likely benign.

• Frequency: Genomes: 𝑓 0.000020 (0 hom., cov: 32)
• Consequence: CHIA NM_201653.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.94
• Publications: 9 publications found

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]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_201653.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHIA	NM_201653.4	MANE Select	c.169G>T	p.Ala57Ser	missense	Exon 4 of 12	NP_970615.2	Q9BZP6-1
	CHIA	NM_001258001.2		c.-68+585G>T		intron	N/A	NP_001244930.1	Q9BZP6-2
	CHIA	NM_001258003.2		c.-68+585G>T		intron	N/A	NP_001244932.1	Q9BZP6-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHIA	ENST00000369740.6	TSL:1 MANE Select	c.169G>T	p.Ala57Ser	missense	Exon 4 of 12	ENSP00000358755.1	Q9BZP6-1
	CHIA	ENST00000422815.5	TSL:1	c.90-2237G>T		intron	N/A	ENSP00000387671.1	Q5VUV5
	CHIA	ENST00000430615.1	TSL:1	c.-68+585G>T		intron	N/A	ENSP00000391132.1	Q9BZP6-2

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 151904 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000726

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 33

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 151904 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74198

African (AFR) AF: 0.0000726 AC: 3 AN: 41348

American (AMR) AF: 0.00 AC: 0 AN: 15250

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3464

East Asian (EAS) AF: 0.00 AC: 0 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4802

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10590

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67958

Other (OTH) AF: 0.00 AC: 0 AN: 2084

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.081	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Benign	0.27	T
Eigen	Uncertain	0.33
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.84	T
M_CAP	Benign	0.012	T
MetaRNN	Uncertain	0.69	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.6	L
PhyloP100		4.9
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-2.2	N
REVEL	Benign	0.15
Sift	Benign	0.067	T
Sift4G	Benign	0.25	T
Polyphen		0.99	D
Vest4		0.48
MutPred		0.79		Loss of sheet (P = 0.1158)
MVP		0.17
MPC		0.20
ClinPred		0.97	D
GERP RS		3.0
Varity_R		0.43
gMVP		0.73
Mutation Taster		=74/26	polymorphism

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

Other links and lift over

dbSNP: rs182022651; hg19: chr1-111854925;