chr16-10907051-C-G

Variant names:

• chr16-10907051-C-G
• rs561841137
• NM_000246.4:c.1559C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000246.4(CIITA):​c.1559C>G​(p.Ala520Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,455,026 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. 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. A520S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CIITA NM_000246.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.734
• Publications: 0 publications found

Genes affected

CIITA (HGNC:7067): (class II major histocompatibility complex transactivator) This gene encodes a protein with an acidic transcriptional activation domain, 4 LRRs (leucine-rich repeats) and a GTP binding domain. The protein is located in the nucleus and acts as a positive regulator of class II major histocompatibility complex gene transcription, and is referred to as the "master control factor" for the expression of these genes. The protein also binds GTP and uses GTP binding to facilitate its own transport into the nucleus. Once in the nucleus it does not bind DNA but rather uses an intrinsic acetyltransferase (AT) activity to act in a coactivator-like fashion. Mutations in this gene have been associated with bare lymphocyte syndrome type II (also known as hereditary MHC class II deficiency or HLA class II-deficient combined immunodeficiency), increased susceptibility to rheumatoid arthritis, multiple sclerosis, and possibly myocardial infarction. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2013]

CIITA Gene-Disease associations (from GenCC):

• MHC class II deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Labcorp Genetics (formerly Invitae)

ENSG00000308110 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.21784565).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000246.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CIITA	NM_000246.4	MANE Select	c.1559C>G	p.Ala520Gly	missense	Exon 11 of 20	NP_000237.2
	CIITA	NM_001286402.1		c.1562C>G	p.Ala521Gly	missense	Exon 11 of 20	NP_001273331.1
	CIITA	NM_001379332.1		c.1562C>G	p.Ala521Gly	missense	Exon 11 of 20	NP_001366261.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CIITA	ENST00000324288.14	TSL:1 MANE Select	c.1559C>G	p.Ala520Gly	missense	Exon 11 of 20	ENSP00000316328.8
	CIITA	ENST00000573309.5	TSL:1	n.1530C>G		non_coding_transcript_exon	Exon 10 of 10
	CIITA	ENST00000381835.9	TSL:1	c.860-1932C>G		intron	N/A	ENSP00000371257.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1455026 Hom.: 0 Cov.: 65 AF XY: 0.00 AC XY: 0 AN XY: 724134

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26124

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86250

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46686

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111950

Other (OTH) AF: 0.00 AC: 0 AN: 60356

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	7.9
DANN	Benign	0.91
Eigen	Benign	-0.53
Eigen_PC	Benign	-0.55
FATHMM_MKL	Benign	0.078	N
LIST_S2	Benign	0.73	T
M_CAP	Uncertain	0.11	D
MetaRNN	Benign	0.22	T
MetaSVM	Benign	-0.71	T
PhyloP100		0.73
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-0.91	N
REVEL	Benign	0.26
Sift	Benign	0.19	T
Sift4G	Benign	0.29	T
Vest4		0.15
MutPred		0.42		Gain of disorder (P = 0.0864)
MVP		0.85
MPC		0.18
ClinPred		0.25	T
GERP RS		4.3
gMVP		0.24

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: rs561841137; hg19: chr16-11000908;