chr2-203868017-G-C

Position:

• chr2-203868017-G-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_005214.5(CTLA4):​c.75G>C​(p.Leu25=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00138 in 1,613,994 control chromosomes in the GnomAD database, including 22 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0071 (12 hom., cov: 33)
  • Exomes 𝑓: 0.00079 (10 hom.)
• Consequence: CTLA4 NM_005214.5 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 0.457

Genes affected

CTLA4 (HGNC:2505): (cytotoxic T-lymphocyte associated protein 4) This gene is a member of the immunoglobulin superfamily and encodes a protein which transmits an inhibitory signal to T cells. The protein contains a V domain, a transmembrane domain, and a cytoplasmic tail. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. The membrane-bound isoform functions as a homodimer interconnected by a disulfide bond, while the soluble isoform functions as a monomer. Mutations in this gene have been associated with insulin-dependent diabetes mellitus, Graves disease, Hashimoto thyroiditis, celiac disease, systemic lupus erythematosus, thyroid-associated orbitopathy, and other autoimmune diseases. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 2-203868017-G-C is Benign according to our data. Variant chr2-203868017-G-C is described in ClinVar as [Benign]. Clinvar id is 475280.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-203868017-G-C is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=0.457 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00707 (1077/152264) while in subpopulation AFR AF= 0.0243 (1010/41528). AF 95% confidence interval is 0.0231. There are 12 homozygotes in gnomad4. There are 486 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 1077 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CTLA4	NM_005214.5	c.75G>C	p.Leu25=	synonymous_variant	1/4	ENST00000648405.2
CTLA4	NM_001037631.3	c.75G>C	p.Leu25=	synonymous_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CTLA4	ENST00000648405.2	c.75G>C	p.Leu25=	synonymous_variant	1/4		NM_005214.5	P1

Frequencies

GnomAD3 genomes AF: 0.00707 AC: 1075 AN: 152146 Hom.: 12 Cov.: 33

Gnomad AFR AF: 0.0243

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00301

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: 0.000176

Gnomad OTH AF: 0.00430

GnomAD3 exomes AF: 0.00192 AC: 482 AN: 251380 Hom.: 4 AF XY: 0.00121 AC XY: 164 AN XY: 135858

Gnomad AFR exome AF: 0.0249

Gnomad AMR exome AF: 0.00139

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000163

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000123

Gnomad OTH exome AF: 0.00147

GnomAD4 exome AF: 0.000785 AC: 1148 AN: 1461730 Hom.: 10 Cov.: 32 AF XY: 0.000657 AC XY: 478 AN XY: 727188

Gnomad4 AFR exome AF: 0.0260

Gnomad4 AMR exome AF: 0.00157

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000756

Gnomad4 SAS exome AF: 0.000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000396

Gnomad4 OTH exome AF: 0.00227

GnomAD4 genome AF: 0.00707 AC: 1077 AN: 152264 Hom.: 12 Cov.: 33 AF XY: 0.00653 AC XY: 486 AN XY: 74462

Gnomad4 AFR AF: 0.0243

Gnomad4 AMR AF: 0.00301

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000176

Gnomad4 OTH AF: 0.00426

Alfa AF: 0.000447 Hom.: 0

Bravo AF: 0.00835

EpiCase AF: 0.000109

EpiControl AF: 0.000119

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Dec 01, 2021	- -
Benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Oct 16, 2023	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Autoimmune lymphoproliferative syndrome due to CTLA4 haploinsufficiency Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.73
DANN	Benign	0.39

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: rs16840275; hg19: chr2-204732740;