chr3-38141150-T-C

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM4

The NM_001365876.1(MYD88):c.736T>C(p.Ter246Argext*?) variant causes a stop lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000026 in 1,614,060 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

MYD88
NM_001365876.1 stop_lost

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter P:2U:1O:1

Conservation

PhyloP100: 7.87

Variant links:

Genes affected

MYD88 (HGNC:7562): (MYD88 innate immune signal transduction adaptor) This gene encodes a cytosolic adapter protein that plays a central role in the innate and adaptive immune response. This protein functions as an essential signal transducer in the interleukin-1 and Toll-like receptor signaling pathways. These pathways regulate that activation of numerous proinflammatory genes. The encoded protein consists of an N-terminal death domain and a C-terminal Toll-interleukin1 receptor domain. Patients with defects in this gene have an increased susceptibility to pyogenic bacterial infections. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Feb 2010]

MYD88 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Stoplost variant in NM_001365876.1 Downstream stopcodon found after 258 codons.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYD88	NM_002468.5 link	c.755T>C	p.Leu252Pro	missense_variant	Exon 5 of 5	ENST00000650905.2	NP_002459.3	Q99836-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYD88	ENST00000650905.2 link	c.755T>C	p.Leu252Pro	missense_variant	Exon 5 of 5		NM_002468.5	ENSP00000498360.2		Q99836-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000517

AC:

AN:

251436

Hom.:

AF XY:

0.0000589

AC XY:

AN XY:

135882

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.000397

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000267

AC:

AN:

1461750

Hom.:

Cov.:

AF XY:

0.0000413

AC XY:

AN XY:

727134

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.000115

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000288

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152310

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000157

Hom.:

ExAC

AF:

0.000107

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:2Uncertain:1Other:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Macroglobulinemia, Waldenstrom, somatic

Pathogenic:1

Dec 06, 2012

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Malignant lymphoma, large B-cell, diffuse

Pathogenic:1

Jul 25, 2023

Wasik Lab, Fox Chase Cancer Center

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant was observed in a patient with DLBCL that presented in leukemic form, best classified as MCD/C5 DLBCL, an ABC subtype. Despite an initial good clinical response to BTK inhibitor ibrutinib, anti-CD20 antibody rituxan, alkylating agent bendamustine, and hematopoietic stem-cell transplant, the lymphoma relapsed, accompanied by morphologic and molecular evidence of disease progression. MYD88 L265P was detected in the tumor at presentation and with increased variant allele frequency, genomic copy number, and RNA expression at recurrence. MYD88 is an essential signaling adaptor protein that interacts with Toll-like receptors (TLR), kinases IRAK1 and IRAK4 to form a ‘myddosome complex’. The L265P mutation is a gain of function oncogenic mutation resulting in spontaneous assembly of the myddosome complex (Ngo et al. 2011) and ultimately NF-kB pathway activation. -

Pyogenic bacterial infections due to MyD88 deficiency

Uncertain:1

Jun 03, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Experimental studies have shown that this missense change affects MYD88 function (PMID: 21179087). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 37055). This variant has been reported as a recurrent somatic mutation in individuals affected with Waldenstr√∂m‚Äôs macroglobulinemia and other related lymphoid neoplasms (PMID: 22931316, 21179087, 23355535), but has not been reported as a germline variant. This variant is present in population databases (rs387907272, gnomAD 0.02%). This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 265 of the MYD88 protein (p.Leu265Pro). -

Neoplasm

Other:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: -

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

0.13

CADD

Pathogenic

DANN

Benign

0.87

DEOGEN2

Benign

0.27

T;T;.;.;.

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.97

D;D;D;D;D

MetaRNN

Uncertain

0.74

D;D;D;D;D

MetaSVM

Benign

-0.48

PrimateAI

Uncertain

0.77

REVEL

Pathogenic

0.73

Polyphen

1.0

.;D;D;.;.

MVP

0.72

MPC

1.8

ClinPred

0.82

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.96

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over