rs1555903974

Positions:

• chr22-23573387-GC-AT

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 2P and 8B. PM2 BP6_Very_Strong

The NM_020070.4(IGLL1):​c.520_521delinsAT​(p.Ala174Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A174S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: IGLL1 NM_020070.4 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.140

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]

(HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 22-23573387-GC-AT is Benign according to our data. Variant chr22-23573387-GC-AT is described in ClinVar as [Likely_benign]. Clinvar id is 538826.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IGLL1	NM_020070.4	c.520_521delinsAT	p.Ala174Met	missense_variant	3/3	ENST00000330377.3
IGLL1	NM_001369906.1	c.523_524delinsAT	p.Ala175Met	missense_variant	3/3
IGLL1	NM_152855.3	c.*149_*150delinsAT		3_prime_UTR_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IGLL1	ENST00000330377.3	c.520_521delinsAT	p.Ala174Met	missense_variant	3/3	1	NM_020070.4	P1
IGLL1	ENST00000249053.3	c.*149_*150delinsAT		3_prime_UTR_variant	2/2	1
	ENST00000458318.2	n.391-78_391-77delinsAT		intron_variant, non_coding_transcript_variant		3
IGLL1	ENST00000438703.1	c.523_524delinsAT	p.Ala175Met	missense_variant	3/3	2

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Agammaglobulinemia 2, autosomal recessive Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Aug 02, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 26, 2024	- -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555903974; hg19: chr22-23915574;