9-34709674-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_002989.4(CCL21):c.197C>A(p.Pro66His) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,590 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CCL21 NM_002989.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.34

Genes affected

CCL21 (HGNC:10620): (C-C motif chemokine ligand 21) This antimicrobial gene is one of several CC cytokine genes clustered on the p-arm of chromosome 9. Cytokines are a family of secreted proteins involved in immunoregulatory and inflammatory processes. The CC cytokines are proteins characterized by two adjacent cysteines. Similar to other chemokines the protein encoded by this gene inhibits hemopoiesis and stimulates chemotaxis. This protein is chemotactic in vitro for thymocytes and activated T cells, but not for B cells, macrophages, or neutrophils. The cytokine encoded by this gene may also play a role in mediating homing of lymphocytes to secondary lymphoid organs. It is a high affinity functional ligand for chemokine receptor 7 that is expressed on T and B lymphocytes and a known receptor for another member of the cytokine family (small inducible cytokine A19). [provided by RefSeq, Sep 2014]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.827

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CCL21	NM_002989.4	c.197C>A	p.Pro66His	missense_variant	3/4	ENST00000259607.7
PHF24	XM_047423102.1	c.133+6636G>T		intron_variant
PHF24	XM_047423103.1	c.70+6636G>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CCL21	ENST00000259607.7	c.197C>A	p.Pro66His	missense_variant	3/4	1	NM_002989.4	P1
	ENST00000664167.1	n.86+6636G>T		intron_variant, non_coding_transcript_variant
CCL21	ENST00000378792.1	c.197C>A	p.Pro66His	missense_variant	3/3	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461590 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727050

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

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 14, 2022

The c.197C>A (p.P66H) alteration is located in exon 3 (coding exon 3) of the CCL21 gene. This alteration results from a C to A substitution at nucleotide position 197, causing the proline (P) at amino acid position 66 to be replaced by a histidine (H). 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	Pathogenic	0.83
BayesDel_addAF	Benign	0.0030	T
BayesDel_noAF	Benign	-0.23
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Benign	0.28	T;T
Eigen	Uncertain	0.44
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.70	T;T
M_CAP	Benign	0.012	T
MetaRNN	Pathogenic	0.83	D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.9	M;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-3.0	D;D
REVEL	Benign	0.24
Sift	Uncertain	0.015	D;D
Sift4G	Benign	0.086	T;T
Polyphen		1.0	D;.
Vest4		0.72
MutPred		0.67		Loss of glycosylation at P66 (P = 0.0338);Loss of glycosylation at P66 (P = 0.0338);
MVP		0.54
MPC		0.60
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.68
gMVP		0.55

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: chr9-34709671;