1-158255188-C-G

Variant summary

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

The NM_001763.3(CD1A):c.163C>G(p.His55Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CD1A NM_001763.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.64

Genes affected

CD1A (HGNC:1634): (CD1a molecule) This gene encodes a member of the CD1 family of transmembrane glycoproteins, which are structurally related to the major histocompatibility complex (MHC) proteins and form heterodimers with beta-2-microglobulin. The CD1 proteins mediate the presentation of primarily lipid and glycolipid antigens of self or microbial origin to T cells. The human genome contains five CD1 family genes organized in a cluster on chromosome 1. The CD1 family members are thought to differ in their cellular localization and specificity for particular lipid ligands. The protein encoded by this gene localizes to the plasma membrane and to recycling vesicles of the early endocytic system. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 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
CD1A	NM_001763.3	c.163C>G	p.His55Asp	missense_variant	2/6	ENST00000289429.6
CD1A	NM_001320652.2	c.130C>G	p.His44Asp	missense_variant	2/6
CD1A	XM_024450738.2	c.-306C>G		5_prime_UTR_variant	3/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CD1A	ENST00000289429.6	c.163C>G	p.His55Asp	missense_variant	2/6	1	NM_001763.3	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461894 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

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

Jul 19, 2022

The c.163C>G (p.H55D) alteration is located in exon 2 (coding exon 2) of the CD1A gene. This alteration results from a C to G substitution at nucleotide position 163, causing the histidine (H) at amino acid position 55 to be replaced by an aspartic acid (D). 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	0.52
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
Cadd	Benign	19
Dann	Benign	0.92
DEOGEN2	Benign	0.22	T
Eigen	Benign	-0.14
Eigen_PC	Benign	-0.38
FATHMM_MKL	Benign	0.040	N
LIST_S2	Benign	0.72	T
M_CAP	Benign	0.0023	T
MetaRNN	Uncertain	0.64	D
MetaSVM	Benign	-0.93	T
MutationAssessor	Pathogenic	3.0	M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.35	T
PROVEAN	Pathogenic	-7.8	D
REVEL	Benign	0.076
Sift	Uncertain	0.019	D
Sift4G	Uncertain	0.023	D
Polyphen		0.92	P
Vest4		0.47
MutPred		0.64		Gain of relative solvent accessibility (P = 0.0522);
MVP		0.41
MPC		0.30
ClinPred		0.93	D
GERP RS		2.6
Varity_R		0.46
gMVP		0.71

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: rs1346600075; hg19: chr1-158224978;