NM_020070.4:c.21G>T

Variant names:

• chr22-23580170-C-A
• rs1044209410
• NM_020070.4:c.21G>T

Variant summary

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

The NM_020070.4(IGLL1):​c.21G>T​(p.Gln7His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000144 in 1,391,300 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 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 nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: IGLL1 NM_020070.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.377
• Publications: 0 publications found

Genes affected

IGLL1 (HGNC:5870): (immunoglobulin lambda like polypeptide 1) The preB cell receptor is found on the surface of proB and preB cells, where it is involved in transduction of signals for cellular proliferation, differentiation from the proB cell to the preB cell stage, allelic exclusion at the Ig heavy chain gene locus, and promotion of Ig light chain gene rearrangements. The preB cell receptor is composed of a membrane-bound Ig mu heavy chain in association with a heterodimeric surrogate light chain. This gene encodes one of the surrogate light chain subunits and is a member of the immunoglobulin gene superfamily. This gene does not undergo rearrangement. Mutations in this gene can result in B cell deficiency and agammaglobulinemia, an autosomal recessive disease in which few or no gamma globulins or antibodies are made. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

IGLL1 Gene-Disease associations (from GenCC):

• agammaglobulinemia 2, autosomal recessive

  Inheritance: Unknown, AR Classification: MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen
• autosomal agammaglobulinemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

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=0.12300497).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020070.4. 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
	IGLL1	NM_020070.4	MANE Select	c.21G>T	p.Gln7His	missense	Exon 1 of 3	NP_064455.1
	IGLL1	NM_001369906.1		c.21G>T	p.Gln7His	missense	Exon 1 of 3	NP_001356835.1
	IGLL1	NM_152855.3		c.21G>T	p.Gln7His	missense	Exon 1 of 2	NP_690594.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IGLL1	ENST00000330377.3	TSL:1 MANE Select	c.21G>T	p.Gln7His	missense	Exon 1 of 3	ENSP00000329312.2
	IGLL1	ENST00000249053.3	TSL:1	c.21G>T	p.Gln7His	missense	Exon 1 of 2	ENSP00000249053.3
	IGLL1	ENST00000438703.1	TSL:2	c.21G>T	p.Gln7His	missense	Exon 1 of 3	ENSP00000403391.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.0000140 AC: 2 AN: 143236 AF XY: 0.0000129

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000177

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000144 AC: 2 AN: 1391300 Hom.: 0 Cov.: 31 AF XY: 0.00000146 AC XY: 1 AN XY: 686890

African (AFR) AF: 0.00 AC: 0 AN: 31946

American (AMR) AF: 0.00 AC: 0 AN: 35822

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25178

East Asian (EAS) AF: 0.0000551 AC: 2 AN: 36306

South Asian (SAS) AF: 0.00 AC: 0 AN: 79388

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 39862

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4712

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1080148

Other (OTH) AF: 0.00 AC: 0 AN: 57938

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	15
DANN	Uncertain	0.98
DEOGEN2	Benign	0.27	T
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.74
FATHMM_MKL	Benign	0.025	N
LIST_S2	Benign	0.51	T
M_CAP	Benign	0.0033	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-0.86	T
MutationAssessor	Benign	1.1	L
PhyloP100		0.38
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-4.0	D
REVEL	Benign	0.15
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.029	D
Polyphen		0.97	D
Vest4		0.18
MutPred		0.085		Gain of methylation at R2 (P = 0.0692)
MVP		0.20
MPC		0.29
ClinPred		0.30	T
GERP RS		0.57
PromoterAI		0.013	Neutral
Varity_R		0.10
gMVP		0.46
Mutation Taster		=97/3	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: rs1044209410; hg19: chr22-23922357;